armv8: ls1028aqds: define ARCH_MISC_INIT to handle mux

[thirdparty/u-boot.git] / common / fdt_support.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2007
 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
 *
 * Copyright 2010-2011 Freescale Semiconductor, Inc.
 */

#include <common.h>
#include <env.h>
#include <mapmem.h>
#include <stdio_dev.h>
#include <linux/ctype.h>
#include <linux/types.h>
#include <asm/global_data.h>
#include <linux/libfdt.h>
#include <fdt_support.h>
#include <exports.h>
#include <fdtdec.h>

/**
 * fdt_getprop_u32_default_node - Return a node's property or a default
 *
 * @fdt: ptr to device tree
 * @off: offset of node
 * @cell: cell offset in property
 * @prop: property name
 * @dflt: default value if the property isn't found
 *
 * Convenience function to return a node's property or a default value if
 * the property doesn't exist.
 */
u32 fdt_getprop_u32_default_node(const void *fdt, int off, int cell,
                                const char *prop, const u32 dflt)
{
        const fdt32_t *val;
        int len;

        val = fdt_getprop(fdt, off, prop, &len);

        /* Check if property exists */
        if (!val)
                return dflt;

        /* Check if property is long enough */
        if (len < ((cell + 1) * sizeof(uint32_t)))
                return dflt;

        return fdt32_to_cpu(*val);
}

/**
 * fdt_getprop_u32_default - Find a node and return it's property or a default
 *
 * @fdt: ptr to device tree
 * @path: path of node
 * @prop: property name
 * @dflt: default value if the property isn't found
 *
 * Convenience function to find a node and return it's property or a
 * default value if it doesn't exist.
 */
u32 fdt_getprop_u32_default(const void *fdt, const char *path,
                                const char *prop, const u32 dflt)
{
        int off;

        off = fdt_path_offset(fdt, path);
        if (off < 0)
                return dflt;

        return fdt_getprop_u32_default_node(fdt, off, 0, prop, dflt);
}

/**
 * fdt_find_and_setprop: Find a node and set it's property
 *
 * @fdt: ptr to device tree
 * @node: path of node
 * @prop: property name
 * @val: ptr to new value
 * @len: length of new property value
 * @create: flag to create the property if it doesn't exist
 *
 * Convenience function to directly set a property given the path to the node.
 */
int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
                         const void *val, int len, int create)
{
        int nodeoff = fdt_path_offset(fdt, node);

        if (nodeoff < 0)
                return nodeoff;

        if ((!create) && (fdt_get_property(fdt, nodeoff, prop, NULL) == NULL))
                return 0; /* create flag not set; so exit quietly */

        return fdt_setprop(fdt, nodeoff, prop, val, len);
}

/**
 * fdt_find_or_add_subnode() - find or possibly add a subnode of a given node
 *
 * @fdt: pointer to the device tree blob
 * @parentoffset: structure block offset of a node
 * @name: name of the subnode to locate
 *
 * fdt_subnode_offset() finds a subnode of the node with a given name.
 * If the subnode does not exist, it will be created.
 */
int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name)
{
        int offset;

        offset = fdt_subnode_offset(fdt, parentoffset, name);

        if (offset == -FDT_ERR_NOTFOUND)
                offset = fdt_add_subnode(fdt, parentoffset, name);

        if (offset < 0)
                printf("%s: %s: %s\n", __func__, name, fdt_strerror(offset));

        return offset;
}

/* rename to CONFIG_OF_STDOUT_PATH ? */
#if defined(OF_STDOUT_PATH)
static int fdt_fixup_stdout(void *fdt, int chosenoff)
{
        return fdt_setprop(fdt, chosenoff, "linux,stdout-path",
                              OF_STDOUT_PATH, strlen(OF_STDOUT_PATH) + 1);
}
#elif defined(CONFIG_OF_STDOUT_VIA_ALIAS) && defined(CONFIG_CONS_INDEX)
static int fdt_fixup_stdout(void *fdt, int chosenoff)
{
        int err;
        int aliasoff;
        char sername[9] = { 0 };
        const void *path;
        int len;
        char tmp[256]; /* long enough */

        sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);

        aliasoff = fdt_path_offset(fdt, "/aliases");
        if (aliasoff < 0) {
                err = aliasoff;
                goto noalias;
        }

        path = fdt_getprop(fdt, aliasoff, sername, &len);
        if (!path) {
                err = len;
                goto noalias;
        }

        /* fdt_setprop may break "path" so we copy it to tmp buffer */
        memcpy(tmp, path, len);

        err = fdt_setprop(fdt, chosenoff, "linux,stdout-path", tmp, len);
        if (err < 0)
                printf("WARNING: could not set linux,stdout-path %s.\n",
                       fdt_strerror(err));

        return err;

noalias:
        printf("WARNING: %s: could not read %s alias: %s\n",
               __func__, sername, fdt_strerror(err));

        return 0;
}
#else
static int fdt_fixup_stdout(void *fdt, int chosenoff)
{
        return 0;
}
#endif

static inline int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name,
                                  uint64_t val, int is_u64)
{
        if (is_u64)
                return fdt_setprop_u64(fdt, nodeoffset, name, val);
        else
                return fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
}

int fdt_root(void *fdt)
{
        char *serial;
        int err;

        err = fdt_check_header(fdt);
        if (err < 0) {
                printf("fdt_root: %s\n", fdt_strerror(err));
                return err;
        }

        serial = env_get("serial#");
        if (serial) {
                err = fdt_setprop(fdt, 0, "serial-number", serial,
                                  strlen(serial) + 1);

                if (err < 0) {
                        printf("WARNING: could not set serial-number %s.\n",
                               fdt_strerror(err));
                        return err;
                }
        }

        return 0;
}

int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
{
        int   nodeoffset;
        int   err, j, total;
        int is_u64;
        uint64_t addr, size;

        /* just return if the size of initrd is zero */
        if (initrd_start == initrd_end)
                return 0;

        /* find or create "/chosen" node. */
        nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
        if (nodeoffset < 0)
                return nodeoffset;

        total = fdt_num_mem_rsv(fdt);

        /*
         * Look for an existing entry and update it.  If we don't find
         * the entry, we will j be the next available slot.
         */
        for (j = 0; j < total; j++) {
                err = fdt_get_mem_rsv(fdt, j, &addr, &size);
                if (addr == initrd_start) {
                        fdt_del_mem_rsv(fdt, j);
                        break;
                }
        }

        err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start);
        if (err < 0) {
                printf("fdt_initrd: %s\n", fdt_strerror(err));
                return err;
        }

        is_u64 = (fdt_address_cells(fdt, 0) == 2);

        err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-start",
                              (uint64_t)initrd_start, is_u64);

        if (err < 0) {
                printf("WARNING: could not set linux,initrd-start %s.\n",
                       fdt_strerror(err));
                return err;
        }

        err = fdt_setprop_uxx(fdt, nodeoffset, "linux,initrd-end",
                              (uint64_t)initrd_end, is_u64);

        if (err < 0) {
                printf("WARNING: could not set linux,initrd-end %s.\n",
                       fdt_strerror(err));

                return err;
        }

        return 0;
}

int fdt_chosen(void *fdt)
{
        int   nodeoffset;
        int   err;
        char  *str;             /* used to set string properties */

        err = fdt_check_header(fdt);
        if (err < 0) {
                printf("fdt_chosen: %s\n", fdt_strerror(err));
                return err;
        }

        /* find or create "/chosen" node. */
        nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
        if (nodeoffset < 0)
                return nodeoffset;

        str = env_get("bootargs");
        if (str) {
                err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
                                  strlen(str) + 1);
                if (err < 0) {
                        printf("WARNING: could not set bootargs %s.\n",
                               fdt_strerror(err));
                        return err;
                }
        }

        return fdt_fixup_stdout(fdt, nodeoffset);
}

void do_fixup_by_path(void *fdt, const char *path, const char *prop,
                      const void *val, int len, int create)
{
#if defined(DEBUG)
        int i;
        debug("Updating property '%s/%s' = ", path, prop);
        for (i = 0; i < len; i++)
                debug(" %.2x", *(u8*)(val+i));
        debug("\n");
#endif
        int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
        if (rc)
                printf("Unable to update property %s:%s, err=%s\n",
                        path, prop, fdt_strerror(rc));
}

void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
                          u32 val, int create)
{
        fdt32_t tmp = cpu_to_fdt32(val);
        do_fixup_by_path(fdt, path, prop, &tmp, sizeof(tmp), create);
}

void do_fixup_by_prop(void *fdt,
                      const char *pname, const void *pval, int plen,
                      const char *prop, const void *val, int len,
                      int create)
{
        int off;
#if defined(DEBUG)
        int i;
        debug("Updating property '%s' = ", prop);
        for (i = 0; i < len; i++)
                debug(" %.2x", *(u8*)(val+i));
        debug("\n");
#endif
        off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
        while (off != -FDT_ERR_NOTFOUND) {
                if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
                        fdt_setprop(fdt, off, prop, val, len);
                off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
        }
}

void do_fixup_by_prop_u32(void *fdt,
                          const char *pname, const void *pval, int plen,
                          const char *prop, u32 val, int create)
{
        fdt32_t tmp = cpu_to_fdt32(val);
        do_fixup_by_prop(fdt, pname, pval, plen, prop, &tmp, 4, create);
}

void do_fixup_by_compat(void *fdt, const char *compat,
                        const char *prop, const void *val, int len, int create)
{
        int off = -1;
#if defined(DEBUG)
        int i;
        debug("Updating property '%s' = ", prop);
        for (i = 0; i < len; i++)
                debug(" %.2x", *(u8*)(val+i));
        debug("\n");
#endif
        off = fdt_node_offset_by_compatible(fdt, -1, compat);
        while (off != -FDT_ERR_NOTFOUND) {
                if (create || (fdt_get_property(fdt, off, prop, NULL) != NULL))
                        fdt_setprop(fdt, off, prop, val, len);
                off = fdt_node_offset_by_compatible(fdt, off, compat);
        }
}

void do_fixup_by_compat_u32(void *fdt, const char *compat,
                            const char *prop, u32 val, int create)
{
        fdt32_t tmp = cpu_to_fdt32(val);
        do_fixup_by_compat(fdt, compat, prop, &tmp, 4, create);
}

#ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
/*
 * fdt_pack_reg - pack address and size array into the "reg"-suitable stream
 */
static int fdt_pack_reg(const void *fdt, void *buf, u64 *address, u64 *size,
                        int n)
{
        int i;
        int address_cells = fdt_address_cells(fdt, 0);
        int size_cells = fdt_size_cells(fdt, 0);
        char *p = buf;

        for (i = 0; i < n; i++) {
                if (address_cells == 2)
                        *(fdt64_t *)p = cpu_to_fdt64(address[i]);
                else
                        *(fdt32_t *)p = cpu_to_fdt32(address[i]);
                p += 4 * address_cells;

                if (size_cells == 2)
                        *(fdt64_t *)p = cpu_to_fdt64(size[i]);
                else
                        *(fdt32_t *)p = cpu_to_fdt32(size[i]);
                p += 4 * size_cells;
        }

        return p - (char *)buf;
}

#if CONFIG_NR_DRAM_BANKS > 4
#define MEMORY_BANKS_MAX CONFIG_NR_DRAM_BANKS
#else
#define MEMORY_BANKS_MAX 4
#endif
int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
{
        int err, nodeoffset;
        int len, i;
        u8 tmp[MEMORY_BANKS_MAX * 16]; /* Up to 64-bit address + 64-bit size */

        if (banks > MEMORY_BANKS_MAX) {
                printf("%s: num banks %d exceeds hardcoded limit %d."
                       " Recompile with higher MEMORY_BANKS_MAX?\n",
                       __FUNCTION__, banks, MEMORY_BANKS_MAX);
                return -1;
        }

        err = fdt_check_header(blob);
        if (err < 0) {
                printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
                return err;
        }

        /* find or create "/memory" node. */
        nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
        if (nodeoffset < 0)
                        return nodeoffset;

        err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
                        sizeof("memory"));
        if (err < 0) {
                printf("WARNING: could not set %s %s.\n", "device_type",
                                fdt_strerror(err));
                return err;
        }

        for (i = 0; i < banks; i++) {
                if (start[i] == 0 && size[i] == 0)
                        break;
        }

        banks = i;

        if (!banks)
                return 0;

        len = fdt_pack_reg(blob, tmp, start, size, banks);

        err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
        if (err < 0) {
                printf("WARNING: could not set %s %s.\n",
                                "reg", fdt_strerror(err));
                return err;
        }
        return 0;
}
#endif

int fdt_fixup_memory(void *blob, u64 start, u64 size)
{
        return fdt_fixup_memory_banks(blob, &start, &size, 1);
}

void fdt_fixup_ethernet(void *fdt)
{
        int i = 0, j, prop;
        char *tmp, *end;
        char mac[16];
        const char *path;
        unsigned char mac_addr[ARP_HLEN];
        int offset;
#ifdef FDT_SEQ_MACADDR_FROM_ENV
        int nodeoff;
        const struct fdt_property *fdt_prop;
#endif

        if (fdt_path_offset(fdt, "/aliases") < 0)
                return;

        /* Cycle through all aliases */
        for (prop = 0; ; prop++) {
                const char *name;

                /* FDT might have been edited, recompute the offset */
                offset = fdt_first_property_offset(fdt,
                        fdt_path_offset(fdt, "/aliases"));
                /* Select property number 'prop' */
                for (j = 0; j < prop; j++)
                        offset = fdt_next_property_offset(fdt, offset);

                if (offset < 0)
                        break;

                path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
                if (!strncmp(name, "ethernet", 8)) {
                        /* Treat plain "ethernet" same as "ethernet0". */
                        if (!strcmp(name, "ethernet")
#ifdef FDT_SEQ_MACADDR_FROM_ENV
                         || !strcmp(name, "ethernet0")
#endif
                        )
                                i = 0;
#ifndef FDT_SEQ_MACADDR_FROM_ENV
                        else
                                i = trailing_strtol(name);
#endif
                        if (i != -1) {
                                if (i == 0)
                                        strcpy(mac, "ethaddr");
                                else
                                        sprintf(mac, "eth%daddr", i);
                        } else {
                                continue;
                        }
#ifdef FDT_SEQ_MACADDR_FROM_ENV
                        nodeoff = fdt_path_offset(fdt, path);
                        fdt_prop = fdt_get_property(fdt, nodeoff, "status",
                                                    NULL);
                        if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
                                continue;
                        i++;
#endif
                        tmp = env_get(mac);
                        if (!tmp)
                                continue;

                        for (j = 0; j < 6; j++) {
                                mac_addr[j] = tmp ?
                                              simple_strtoul(tmp, &end, 16) : 0;
                                if (tmp)
                                        tmp = (*end) ? end + 1 : end;
                        }

                        do_fixup_by_path(fdt, path, "mac-address",
                                         &mac_addr, 6, 0);
                        do_fixup_by_path(fdt, path, "local-mac-address",
                                         &mac_addr, 6, 1);
                }
        }
}

int fdt_record_loadable(void *blob, u32 index, const char *name,
                        uintptr_t load_addr, u32 size, uintptr_t entry_point,
                        const char *type, const char *os)
{
        int err, node;

        err = fdt_check_header(blob);
        if (err < 0) {
                printf("%s: %s\n", __func__, fdt_strerror(err));
                return err;
        }

        /* find or create "/fit-images" node */
        node = fdt_find_or_add_subnode(blob, 0, "fit-images");
        if (node < 0)
                return node;

        /* find or create "/fit-images/<name>" node */
        node = fdt_find_or_add_subnode(blob, node, name);
        if (node < 0)
                return node;

        /*
         * We record these as 32bit entities, possibly truncating addresses.
         * However, spl_fit.c is not 64bit safe either: i.e. we should not
         * have an issue here.
         */
        fdt_setprop_u32(blob, node, "load-addr", load_addr);
        if (entry_point != -1)
                fdt_setprop_u32(blob, node, "entry-point", entry_point);
        fdt_setprop_u32(blob, node, "size", size);
        if (type)
                fdt_setprop_string(blob, node, "type", type);
        if (os)
                fdt_setprop_string(blob, node, "os", os);

        return node;
}

/* Resize the fdt to its actual size + a bit of padding */
int fdt_shrink_to_minimum(void *blob, uint extrasize)
{
        int i;
        uint64_t addr, size;
        int total, ret;
        uint actualsize;
        int fdt_memrsv = 0;

        if (!blob)
                return 0;

        total = fdt_num_mem_rsv(blob);
        for (i = 0; i < total; i++) {
                fdt_get_mem_rsv(blob, i, &addr, &size);
                if (addr == (uintptr_t)blob) {
                        fdt_del_mem_rsv(blob, i);
                        fdt_memrsv = 1;
                        break;
                }
        }

        /*
         * Calculate the actual size of the fdt
         * plus the size needed for 5 fdt_add_mem_rsv, one
         * for the fdt itself and 4 for a possible initrd
         * ((initrd-start + initrd-end) * 2 (name & value))
         */
        actualsize = fdt_off_dt_strings(blob) +
                fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);

        actualsize += extrasize;
        /* Make it so the fdt ends on a page boundary */
        actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
        actualsize = actualsize - ((uintptr_t)blob & 0xfff);

        /* Change the fdt header to reflect the correct size */
        fdt_set_totalsize(blob, actualsize);

        if (fdt_memrsv) {
                /* Add the new reservation */
                ret = fdt_add_mem_rsv(blob, map_to_sysmem(blob), actualsize);
                if (ret < 0)
                        return ret;
        }

        return actualsize;
}

#ifdef CONFIG_PCI
#define CONFIG_SYS_PCI_NR_INBOUND_WIN 4

#define FDT_PCI_PREFETCH        (0x40000000)
#define FDT_PCI_MEM32           (0x02000000)
#define FDT_PCI_IO              (0x01000000)
#define FDT_PCI_MEM64           (0x03000000)

int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {

        int addrcell, sizecell, len, r;
        u32 *dma_range;
        /* sized based on pci addr cells, size-cells, & address-cells */
        u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];

        addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
        sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);

        dma_range = &dma_ranges[0];
        for (r = 0; r < hose->region_count; r++) {
                u64 bus_start, phys_start, size;

                /* skip if !PCI_REGION_SYS_MEMORY */
                if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
                        continue;

                bus_start = (u64)hose->regions[r].bus_start;
                phys_start = (u64)hose->regions[r].phys_start;
                size = (u64)hose->regions[r].size;

                dma_range[0] = 0;
                if (size >= 0x100000000ull)
                        dma_range[0] |= cpu_to_fdt32(FDT_PCI_MEM64);
                else
                        dma_range[0] |= cpu_to_fdt32(FDT_PCI_MEM32);
                if (hose->regions[r].flags & PCI_REGION_PREFETCH)
                        dma_range[0] |= cpu_to_fdt32(FDT_PCI_PREFETCH);
#ifdef CONFIG_SYS_PCI_64BIT
                dma_range[1] = cpu_to_fdt32(bus_start >> 32);
#else
                dma_range[1] = 0;
#endif
                dma_range[2] = cpu_to_fdt32(bus_start & 0xffffffff);

                if (addrcell == 2) {
                        dma_range[3] = cpu_to_fdt32(phys_start >> 32);
                        dma_range[4] = cpu_to_fdt32(phys_start & 0xffffffff);
                } else {
                        dma_range[3] = cpu_to_fdt32(phys_start & 0xffffffff);
                }

                if (sizecell == 2) {
                        dma_range[3 + addrcell + 0] =
                                cpu_to_fdt32(size >> 32);
                        dma_range[3 + addrcell + 1] =
                                cpu_to_fdt32(size & 0xffffffff);
                } else {
                        dma_range[3 + addrcell + 0] =
                                cpu_to_fdt32(size & 0xffffffff);
                }

                dma_range += (3 + addrcell + sizecell);
        }

        len = dma_range - &dma_ranges[0];
        if (len)
                fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);

        return 0;
}
#endif

int fdt_increase_size(void *fdt, int add_len)
{
        int newlen;

        newlen = fdt_totalsize(fdt) + add_len;

        /* Open in place with a new len */
        return fdt_open_into(fdt, fdt, newlen);
}

#ifdef CONFIG_FDT_FIXUP_PARTITIONS
#include <jffs2/load_kernel.h>
#include <mtd_node.h>

static int fdt_del_subnodes(const void *blob, int parent_offset)
{
        int off, ndepth;
        int ret;

        for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
             (off >= 0) && (ndepth > 0);
             off = fdt_next_node(blob, off, &ndepth)) {
                if (ndepth == 1) {
                        debug("delete %s: offset: %x\n",
                                fdt_get_name(blob, off, 0), off);
                        ret = fdt_del_node((void *)blob, off);
                        if (ret < 0) {
                                printf("Can't delete node: %s\n",
                                        fdt_strerror(ret));
                                return ret;
                        } else {
                                ndepth = 0;
                                off = parent_offset;
                        }
                }
        }
        return 0;
}

static int fdt_del_partitions(void *blob, int parent_offset)
{
        const void *prop;
        int ndepth = 0;
        int off;
        int ret;

        off = fdt_next_node(blob, parent_offset, &ndepth);
        if (off > 0 && ndepth == 1) {
                prop = fdt_getprop(blob, off, "label", NULL);
                if (prop == NULL) {
                        /*
                         * Could not find label property, nand {}; node?
                         * Check subnode, delete partitions there if any.
                         */
                        return fdt_del_partitions(blob, off);
                } else {
                        ret = fdt_del_subnodes(blob, parent_offset);
                        if (ret < 0) {
                                printf("Can't remove subnodes: %s\n",
                                        fdt_strerror(ret));
                                return ret;
                        }
                }
        }
        return 0;
}

int fdt_node_set_part_info(void *blob, int parent_offset,
                           struct mtd_device *dev)
{
        struct list_head *pentry;
        struct part_info *part;
        int off, ndepth = 0;
        int part_num, ret;
        int sizecell;
        char buf[64];

        ret = fdt_del_partitions(blob, parent_offset);
        if (ret < 0)
                return ret;

        /*
         * Check if size/address is 1 or 2 cells.
         * We assume #address-cells and #size-cells have same value.
         */
        sizecell = fdt_getprop_u32_default_node(blob, parent_offset,
                                                0, "#size-cells", 1);

        /*
         * Check if it is nand {}; subnode, adjust
         * the offset in this case
         */
        off = fdt_next_node(blob, parent_offset, &ndepth);
        if (off > 0 && ndepth == 1)
                parent_offset = off;

        part_num = 0;
        list_for_each_prev(pentry, &dev->parts) {
                int newoff;

                part = list_entry(pentry, struct part_info, link);

                debug("%2d: %-20s0x%08llx\t0x%08llx\t%d\n",
                        part_num, part->name, part->size,
                        part->offset, part->mask_flags);

                sprintf(buf, "partition@%llx", part->offset);
add_sub:
                ret = fdt_add_subnode(blob, parent_offset, buf);
                if (ret == -FDT_ERR_NOSPACE) {
                        ret = fdt_increase_size(blob, 512);
                        if (!ret)
                                goto add_sub;
                        else
                                goto err_size;
                } else if (ret < 0) {
                        printf("Can't add partition node: %s\n",
                                fdt_strerror(ret));
                        return ret;
                }
                newoff = ret;

                /* Check MTD_WRITEABLE_CMD flag */
                if (part->mask_flags & 1) {
add_ro:
                        ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
                        if (ret == -FDT_ERR_NOSPACE) {
                                ret = fdt_increase_size(blob, 512);
                                if (!ret)
                                        goto add_ro;
                                else
                                        goto err_size;
                        } else if (ret < 0)
                                goto err_prop;
                }

add_reg:
                if (sizecell == 2) {
                        ret = fdt_setprop_u64(blob, newoff,
                                              "reg", part->offset);
                        if (!ret)
                                ret = fdt_appendprop_u64(blob, newoff,
                                                         "reg", part->size);
                } else {
                        ret = fdt_setprop_u32(blob, newoff,
                                              "reg", part->offset);
                        if (!ret)
                                ret = fdt_appendprop_u32(blob, newoff,
                                                         "reg", part->size);
                }

                if (ret == -FDT_ERR_NOSPACE) {
                        ret = fdt_increase_size(blob, 512);
                        if (!ret)
                                goto add_reg;
                        else
                                goto err_size;
                } else if (ret < 0)
                        goto err_prop;

add_label:
                ret = fdt_setprop_string(blob, newoff, "label", part->name);
                if (ret == -FDT_ERR_NOSPACE) {
                        ret = fdt_increase_size(blob, 512);
                        if (!ret)
                                goto add_label;
                        else
                                goto err_size;
                } else if (ret < 0)
                        goto err_prop;

                part_num++;
        }
        return 0;
err_size:
        printf("Can't increase blob size: %s\n", fdt_strerror(ret));
        return ret;
err_prop:
        printf("Can't add property: %s\n", fdt_strerror(ret));
        return ret;
}

/*
 * Update partitions in nor/nand nodes using info from
 * mtdparts environment variable. The nodes to update are
 * specified by node_info structure which contains mtd device
 * type and compatible string: E. g. the board code in
 * ft_board_setup() could use:
 *
 *      struct node_info nodes[] = {
 *              { "fsl,mpc5121-nfc",    MTD_DEV_TYPE_NAND, },
 *              { "cfi-flash",          MTD_DEV_TYPE_NOR,  },
 *      };
 *
 *      fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
 */
void fdt_fixup_mtdparts(void *blob, const struct node_info *node_info,
                        int node_info_size)
{
        struct mtd_device *dev;
        int i, idx;
        int noff;

        if (mtdparts_init() != 0)
                return;

        for (i = 0; i < node_info_size; i++) {
                idx = 0;
                noff = fdt_node_offset_by_compatible(blob, -1,
                                                     node_info[i].compat);
                while (noff != -FDT_ERR_NOTFOUND) {
                        debug("%s: %s, mtd dev type %d\n",
                                fdt_get_name(blob, noff, 0),
                                node_info[i].compat, node_info[i].type);
                        dev = device_find(node_info[i].type, idx++);
                        if (dev) {
                                if (fdt_node_set_part_info(blob, noff, dev))
                                        return; /* return on error */
                        }

                        /* Jump to next flash node */
                        noff = fdt_node_offset_by_compatible(blob, noff,
                                                             node_info[i].compat);
                }
        }
}
#endif

void fdt_del_node_and_alias(void *blob, const char *alias)
{
        int off = fdt_path_offset(blob, alias);

        if (off < 0)
                return;

        fdt_del_node(blob, off);

        off = fdt_path_offset(blob, "/aliases");
        fdt_delprop(blob, off, alias);
}

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS       4
#define OF_BAD_ADDR     FDT_ADDR_T_NONE
#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
                        (ns) > 0)

/* Debug utility */
#ifdef DEBUG
static void of_dump_addr(const char *s, const fdt32_t *addr, int na)
{
        printf("%s", s);
        while(na--)
                printf(" %08x", *(addr++));
        printf("\n");
}
#else
static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
#endif

/**
 * struct of_bus - Callbacks for bus specific translators
 * @name:       A string used to identify this bus in debug output.
 * @addresses:  The name of the DT property from which addresses are
 *              to be read, typically "reg".
 * @match:      Return non-zero if the node whose parent is at
 *              parentoffset in the FDT blob corresponds to a bus
 *              of this type, otherwise return zero. If NULL a match
 *              is assumed.
 * @count_cells:Count how many cells (be32 values) a node whose parent
 *              is at parentoffset in the FDT blob will require to
 *              represent its address (written to *addrc) & size
 *              (written to *sizec).
 * @map:        Map the address addr from the address space of this
 *              bus to that of its parent, making use of the ranges
 *              read from DT to an array at range. na and ns are the
 *              number of cells (be32 values) used to hold and address
 *              or size, respectively, for this bus. pna is the number
 *              of cells used to hold an address for the parent bus.
 *              Returns the address in the address space of the parent
 *              bus.
 * @translate:  Update the value of the address cells at addr within an
 *              FDT by adding offset to it. na specifies the number of
 *              cells used to hold the address being translated. Returns
 *              zero on success, non-zero on error.
 *
 * Each bus type will include a struct of_bus in the of_busses array,
 * providing implementations of some or all of the functions used to
 * match the bus & handle address translation for its children.
 */
struct of_bus {
        const char      *name;
        const char      *addresses;
        int             (*match)(const void *blob, int parentoffset);
        void            (*count_cells)(const void *blob, int parentoffset,
                                int *addrc, int *sizec);
        u64             (*map)(fdt32_t *addr, const fdt32_t *range,
                                int na, int ns, int pna);
        int             (*translate)(fdt32_t *addr, u64 offset, int na);
};

/* Default translator (generic bus) */
void fdt_support_default_count_cells(const void *blob, int parentoffset,
                                        int *addrc, int *sizec)
{
        const fdt32_t *prop;

        if (addrc)
                *addrc = fdt_address_cells(blob, parentoffset);

        if (sizec) {
                prop = fdt_getprop(blob, parentoffset, "#size-cells", NULL);
                if (prop)
                        *sizec = be32_to_cpup(prop);
                else
                        *sizec = 1;
        }
}

static u64 of_bus_default_map(fdt32_t *addr, const fdt32_t *range,
                int na, int ns, int pna)
{
        u64 cp, s, da;

        cp = fdt_read_number(range, na);
        s  = fdt_read_number(range + na + pna, ns);
        da = fdt_read_number(addr, na);

        debug("OF: default map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);

        if (da < cp || da >= (cp + s))
                return OF_BAD_ADDR;
        return da - cp;
}

static int of_bus_default_translate(fdt32_t *addr, u64 offset, int na)
{
        u64 a = fdt_read_number(addr, na);
        memset(addr, 0, na * 4);
        a += offset;
        if (na > 1)
                addr[na - 2] = cpu_to_fdt32(a >> 32);
        addr[na - 1] = cpu_to_fdt32(a & 0xffffffffu);

        return 0;
}

#ifdef CONFIG_OF_ISA_BUS

/* ISA bus translator */
static int of_bus_isa_match(const void *blob, int parentoffset)
{
        const char *name;

        name = fdt_get_name(blob, parentoffset, NULL);
        if (!name)
                return 0;

        return !strcmp(name, "isa");
}

static void of_bus_isa_count_cells(const void *blob, int parentoffset,
                                   int *addrc, int *sizec)
{
        if (addrc)
                *addrc = 2;
        if (sizec)
                *sizec = 1;
}

static u64 of_bus_isa_map(fdt32_t *addr, const fdt32_t *range,
                          int na, int ns, int pna)
{
        u64 cp, s, da;

        /* Check address type match */
        if ((addr[0] ^ range[0]) & cpu_to_be32(1))
                return OF_BAD_ADDR;

        cp = fdt_read_number(range + 1, na - 1);
        s  = fdt_read_number(range + na + pna, ns);
        da = fdt_read_number(addr + 1, na - 1);

        debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n", cp, s, da);

        if (da < cp || da >= (cp + s))
                return OF_BAD_ADDR;
        return da - cp;
}

static int of_bus_isa_translate(fdt32_t *addr, u64 offset, int na)
{
        return of_bus_default_translate(addr + 1, offset, na - 1);
}

#endif /* CONFIG_OF_ISA_BUS */

/* Array of bus specific translators */
static struct of_bus of_busses[] = {
#ifdef CONFIG_OF_ISA_BUS
        /* ISA */
        {
                .name = "isa",
                .addresses = "reg",
                .match = of_bus_isa_match,
                .count_cells = of_bus_isa_count_cells,
                .map = of_bus_isa_map,
                .translate = of_bus_isa_translate,
        },
#endif /* CONFIG_OF_ISA_BUS */
        /* Default */
        {
                .name = "default",
                .addresses = "reg",
                .count_cells = fdt_support_default_count_cells,
                .map = of_bus_default_map,
                .translate = of_bus_default_translate,
        },
};

static struct of_bus *of_match_bus(const void *blob, int parentoffset)
{
        struct of_bus *bus;

        if (ARRAY_SIZE(of_busses) == 1)
                return of_busses;

        for (bus = of_busses; bus; bus++) {
                if (!bus->match || bus->match(blob, parentoffset))
                        return bus;
        }

        /*
         * We should always have matched the default bus at least, since
         * it has a NULL match field. If we didn't then it somehow isn't
         * in the of_busses array or something equally catastrophic has
         * gone wrong.
         */
        assert(0);
        return NULL;
}

static int of_translate_one(const void *blob, int parent, struct of_bus *bus,
                            struct of_bus *pbus, fdt32_t *addr,
                            int na, int ns, int pna, const char *rprop)
{
        const fdt32_t *ranges;
        int rlen;
        int rone;
        u64 offset = OF_BAD_ADDR;

        /* Normally, an absence of a "ranges" property means we are
         * crossing a non-translatable boundary, and thus the addresses
         * below the current not cannot be converted to CPU physical ones.
         * Unfortunately, while this is very clear in the spec, it's not
         * what Apple understood, and they do have things like /uni-n or
         * /ht nodes with no "ranges" property and a lot of perfectly
         * useable mapped devices below them. Thus we treat the absence of
         * "ranges" as equivalent to an empty "ranges" property which means
         * a 1:1 translation at that level. It's up to the caller not to try
         * to translate addresses that aren't supposed to be translated in
         * the first place. --BenH.
         */
        ranges = fdt_getprop(blob, parent, rprop, &rlen);
        if (ranges == NULL || rlen == 0) {
                offset = fdt_read_number(addr, na);
                memset(addr, 0, pna * 4);
                debug("OF: no ranges, 1:1 translation\n");
                goto finish;
        }

        debug("OF: walking ranges...\n");

        /* Now walk through the ranges */
        rlen /= 4;
        rone = na + pna + ns;
        for (; rlen >= rone; rlen -= rone, ranges += rone) {
                offset = bus->map(addr, ranges, na, ns, pna);
                if (offset != OF_BAD_ADDR)
                        break;
        }
        if (offset == OF_BAD_ADDR) {
                debug("OF: not found !\n");
                return 1;
        }
        memcpy(addr, ranges + na, 4 * pna);

 finish:
        of_dump_addr("OF: parent translation for:", addr, pna);
        debug("OF: with offset: %llu\n", offset);

        /* Translate it into parent bus space */
        return pbus->translate(addr, offset, pna);
}

/*
 * Translate an address from the device-tree into a CPU physical address,
 * this walks up the tree and applies the various bus mappings on the
 * way.
 *
 * Note: We consider that crossing any level with #size-cells == 0 to mean
 * that translation is impossible (that is we are not dealing with a value
 * that can be mapped to a cpu physical address). This is not really specified
 * that way, but this is traditionally the way IBM at least do things
 */
static u64 __of_translate_address(const void *blob, int node_offset,
                                  const fdt32_t *in_addr, const char *rprop)
{
        int parent;
        struct of_bus *bus, *pbus;
        fdt32_t addr[OF_MAX_ADDR_CELLS];
        int na, ns, pna, pns;
        u64 result = OF_BAD_ADDR;

        debug("OF: ** translation for device %s **\n",
                fdt_get_name(blob, node_offset, NULL));

        /* Get parent & match bus type */
        parent = fdt_parent_offset(blob, node_offset);
        if (parent < 0)
                goto bail;
        bus = of_match_bus(blob, parent);

        /* Cound address cells & copy address locally */
        bus->count_cells(blob, parent, &na, &ns);
        if (!OF_CHECK_COUNTS(na, ns)) {
                printf("%s: Bad cell count for %s\n", __FUNCTION__,
                       fdt_get_name(blob, node_offset, NULL));
                goto bail;
        }
        memcpy(addr, in_addr, na * 4);

        debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
            bus->name, na, ns, fdt_get_name(blob, parent, NULL));
        of_dump_addr("OF: translating address:", addr, na);

        /* Translate */
        for (;;) {
                /* Switch to parent bus */
                node_offset = parent;
                parent = fdt_parent_offset(blob, node_offset);

                /* If root, we have finished */
                if (parent < 0) {
                        debug("OF: reached root node\n");
                        result = fdt_read_number(addr, na);
                        break;
                }

                /* Get new parent bus and counts */
                pbus = of_match_bus(blob, parent);
                pbus->count_cells(blob, parent, &pna, &pns);
                if (!OF_CHECK_COUNTS(pna, pns)) {
                        printf("%s: Bad cell count for %s\n", __FUNCTION__,
                                fdt_get_name(blob, node_offset, NULL));
                        break;
                }

                debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
                    pbus->name, pna, pns, fdt_get_name(blob, parent, NULL));

                /* Apply bus translation */
                if (of_translate_one(blob, node_offset, bus, pbus,
                                        addr, na, ns, pna, rprop))
                        break;

                /* Complete the move up one level */
                na = pna;
                ns = pns;
                bus = pbus;

                of_dump_addr("OF: one level translation:", addr, na);
        }
 bail:

        return result;
}

u64 fdt_translate_address(const void *blob, int node_offset,
                          const fdt32_t *in_addr)
{
        return __of_translate_address(blob, node_offset, in_addr, "ranges");
}

u64 fdt_translate_dma_address(const void *blob, int node_offset,
                              const fdt32_t *in_addr)
{
        return __of_translate_address(blob, node_offset, in_addr, "dma-ranges");
}

/**
 * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
 * who's reg property matches a physical cpu address
 *
 * @blob: ptr to device tree
 * @compat: compatiable string to match
 * @compat_off: property name
 *
 */
int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
                                        phys_addr_t compat_off)
{
        int len, off = fdt_node_offset_by_compatible(blob, -1, compat);
        while (off != -FDT_ERR_NOTFOUND) {
                const fdt32_t *reg = fdt_getprop(blob, off, "reg", &len);
                if (reg) {
                        if (compat_off == fdt_translate_address(blob, off, reg))
                                return off;
                }
                off = fdt_node_offset_by_compatible(blob, off, compat);
        }

        return -FDT_ERR_NOTFOUND;
}

/**
 * fdt_alloc_phandle: Return next free phandle value
 *
 * @blob: ptr to device tree
 */
int fdt_alloc_phandle(void *blob)
{
        int offset;
        uint32_t phandle = 0;

        for (offset = fdt_next_node(blob, -1, NULL); offset >= 0;
             offset = fdt_next_node(blob, offset, NULL)) {
                phandle = max(phandle, fdt_get_phandle(blob, offset));
        }

        return phandle + 1;
}

/*
 * fdt_set_phandle: Create a phandle property for the given node
 *
 * @fdt: ptr to device tree
 * @nodeoffset: node to update
 * @phandle: phandle value to set (must be unique)
 */
int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle)
{
        int ret;

#ifdef DEBUG
        int off = fdt_node_offset_by_phandle(fdt, phandle);

        if ((off >= 0) && (off != nodeoffset)) {
                char buf[64];

                fdt_get_path(fdt, nodeoffset, buf, sizeof(buf));
                printf("Trying to update node %s with phandle %u ",
                       buf, phandle);

                fdt_get_path(fdt, off, buf, sizeof(buf));
                printf("that already exists in node %s.\n", buf);
                return -FDT_ERR_BADPHANDLE;
        }
#endif

        ret = fdt_setprop_cell(fdt, nodeoffset, "phandle", phandle);
        if (ret < 0)
                return ret;

        /*
         * For now, also set the deprecated "linux,phandle" property, so that we
         * don't break older kernels.
         */
        ret = fdt_setprop_cell(fdt, nodeoffset, "linux,phandle", phandle);

        return ret;
}

/*
 * fdt_create_phandle: Create a phandle property for the given node
 *
 * @fdt: ptr to device tree
 * @nodeoffset: node to update
 */
unsigned int fdt_create_phandle(void *fdt, int nodeoffset)
{
        /* see if there is a phandle already */
        int phandle = fdt_get_phandle(fdt, nodeoffset);

        /* if we got 0, means no phandle so create one */
        if (phandle == 0) {
                int ret;

                phandle = fdt_alloc_phandle(fdt);
                ret = fdt_set_phandle(fdt, nodeoffset, phandle);
                if (ret < 0) {
                        printf("Can't set phandle %u: %s\n", phandle,
                               fdt_strerror(ret));
                        return 0;
                }
        }

        return phandle;
}

/*
 * fdt_set_node_status: Set status for the given node
 *
 * @fdt: ptr to device tree
 * @nodeoffset: node to update
 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
 *          FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
 */
int fdt_set_node_status(void *fdt, int nodeoffset,
                        enum fdt_status status, unsigned int error_code)
{
        char buf[16];
        int ret = 0;

        if (nodeoffset < 0)
                return nodeoffset;

        switch (status) {
        case FDT_STATUS_OKAY:
                ret = fdt_setprop_string(fdt, nodeoffset, "status", "okay");
                break;
        case FDT_STATUS_DISABLED:
                ret = fdt_setprop_string(fdt, nodeoffset, "status", "disabled");
                break;
        case FDT_STATUS_FAIL:
                ret = fdt_setprop_string(fdt, nodeoffset, "status", "fail");
                break;
        case FDT_STATUS_FAIL_ERROR_CODE:
                sprintf(buf, "fail-%d", error_code);
                ret = fdt_setprop_string(fdt, nodeoffset, "status", buf);
                break;
        default:
                printf("Invalid fdt status: %x\n", status);
                ret = -1;
                break;
        }

        return ret;
}

/*
 * fdt_set_status_by_alias: Set status for the given node given an alias
 *
 * @fdt: ptr to device tree
 * @alias: alias of node to update
 * @status: FDT_STATUS_OKAY, FDT_STATUS_DISABLED,
 *          FDT_STATUS_FAIL, FDT_STATUS_FAIL_ERROR_CODE
 * @error_code: optional, only used if status is FDT_STATUS_FAIL_ERROR_CODE
 */
int fdt_set_status_by_alias(void *fdt, const char* alias,
                            enum fdt_status status, unsigned int error_code)
{
        int offset = fdt_path_offset(fdt, alias);

        return fdt_set_node_status(fdt, offset, status, error_code);
}

#if defined(CONFIG_VIDEO) || defined(CONFIG_LCD)
int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
{
        int noff;
        int ret;

        noff = fdt_node_offset_by_compatible(blob, -1, compat);
        if (noff != -FDT_ERR_NOTFOUND) {
                debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
add_edid:
                ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
                if (ret == -FDT_ERR_NOSPACE) {
                        ret = fdt_increase_size(blob, 512);
                        if (!ret)
                                goto add_edid;
                        else
                                goto err_size;
                } else if (ret < 0) {
                        printf("Can't add property: %s\n", fdt_strerror(ret));
                        return ret;
                }
        }
        return 0;
err_size:
        printf("Can't increase blob size: %s\n", fdt_strerror(ret));
        return ret;
}
#endif

/*
 * Verify the physical address of device tree node for a given alias
 *
 * This function locates the device tree node of a given alias, and then
 * verifies that the physical address of that device matches the given
 * parameter.  It displays a message if there is a mismatch.
 *
 * Returns 1 on success, 0 on failure
 */
int fdt_verify_alias_address(void *fdt, int anode, const char *alias, u64 addr)
{
        const char *path;
        const fdt32_t *reg;
        int node, len;
        u64 dt_addr;

        path = fdt_getprop(fdt, anode, alias, NULL);
        if (!path) {
                /* If there's no such alias, then it's not a failure */
                return 1;
        }

        node = fdt_path_offset(fdt, path);
        if (node < 0) {
                printf("Warning: device tree alias '%s' points to invalid "
                       "node %s.\n", alias, path);
                return 0;
        }

        reg = fdt_getprop(fdt, node, "reg", &len);
        if (!reg) {
                printf("Warning: device tree node '%s' has no address.\n",
                       path);
                return 0;
        }

        dt_addr = fdt_translate_address(fdt, node, reg);
        if (addr != dt_addr) {
                printf("Warning: U-Boot configured device %s at address %llu,\n"
                       "but the device tree has it address %llx.\n",
                       alias, addr, dt_addr);
                return 0;
        }

        return 1;
}

/*
 * Returns the base address of an SOC or PCI node
 */
u64 fdt_get_base_address(const void *fdt, int node)
{
        int size;
        const fdt32_t *prop;

        prop = fdt_getprop(fdt, node, "reg", &size);

        return prop ? fdt_translate_address(fdt, node, prop) : OF_BAD_ADDR;
}

/*
 * Read a property of size <prop_len>. Currently only supports 1 or 2 cells.
 */
static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
                         uint64_t *val, int cells)
{
        const fdt32_t *prop32 = &prop[cell_off];
        const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];

        if ((cell_off + cells) > prop_len)
                return -FDT_ERR_NOSPACE;

        switch (cells) {
        case 1:
                *val = fdt32_to_cpu(*prop32);
                break;
        case 2:
                *val = fdt64_to_cpu(*prop64);
                break;
        default:
                return -FDT_ERR_NOSPACE;
        }

        return 0;
}

/**
 * fdt_read_range - Read a node's n'th range property
 *
 * @fdt: ptr to device tree
 * @node: offset of node
 * @n: range index
 * @child_addr: pointer to storage for the "child address" field
 * @addr: pointer to storage for the CPU view translated physical start
 * @len: pointer to storage for the range length
 *
 * Convenience function that reads and interprets a specific range out of
 * a number of the "ranges" property array.
 */
int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
                   uint64_t *addr, uint64_t *len)
{
        int pnode = fdt_parent_offset(fdt, node);
        const fdt32_t *ranges;
        int pacells;
        int acells;
        int scells;
        int ranges_len;
        int cell = 0;
        int r = 0;

        /*
         * The "ranges" property is an array of
         * { <child address> <parent address> <size in child address space> }
         *
         * All 3 elements can span a diffent number of cells. Fetch their size.
         */
        pacells = fdt_getprop_u32_default_node(fdt, pnode, 0, "#address-cells", 1);
        acells = fdt_getprop_u32_default_node(fdt, node, 0, "#address-cells", 1);
        scells = fdt_getprop_u32_default_node(fdt, node, 0, "#size-cells", 1);

        /* Now try to get the ranges property */
        ranges = fdt_getprop(fdt, node, "ranges", &ranges_len);
        if (!ranges)
                return -FDT_ERR_NOTFOUND;
        ranges_len /= sizeof(uint32_t);

        /* Jump to the n'th entry */
        cell = n * (pacells + acells + scells);

        /* Read <child address> */
        if (child_addr) {
                r = fdt_read_prop(ranges, ranges_len, cell, child_addr,
                                  acells);
                if (r)
                        return r;
        }
        cell += acells;

        /* Read <parent address> */
        if (addr)
                *addr = fdt_translate_address(fdt, node, ranges + cell);
        cell += pacells;

        /* Read <size in child address space> */
        if (len) {
                r = fdt_read_prop(ranges, ranges_len, cell, len, scells);
                if (r)
                        return r;
        }

        return 0;
}

/**
 * fdt_setup_simplefb_node - Fill and enable a simplefb node
 *
 * @fdt: ptr to device tree
 * @node: offset of the simplefb node
 * @base_address: framebuffer base address
 * @width: width in pixels
 * @height: height in pixels
 * @stride: bytes per line
 * @format: pixel format string
 *
 * Convenience function to fill and enable a simplefb node.
 */
int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
                            u32 height, u32 stride, const char *format)
{
        char name[32];
        fdt32_t cells[4];
        int i, addrc, sizec, ret;

        fdt_support_default_count_cells(fdt, fdt_parent_offset(fdt, node),
                                        &addrc, &sizec);
        i = 0;
        if (addrc == 2)
                cells[i++] = cpu_to_fdt32(base_address >> 32);
        cells[i++] = cpu_to_fdt32(base_address);
        if (sizec == 2)
                cells[i++] = 0;
        cells[i++] = cpu_to_fdt32(height * stride);

        ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
        if (ret < 0)
                return ret;

        snprintf(name, sizeof(name), "framebuffer@%llx", base_address);
        ret = fdt_set_name(fdt, node, name);
        if (ret < 0)
                return ret;

        ret = fdt_setprop_u32(fdt, node, "width", width);
        if (ret < 0)
                return ret;

        ret = fdt_setprop_u32(fdt, node, "height", height);
        if (ret < 0)
                return ret;

        ret = fdt_setprop_u32(fdt, node, "stride", stride);
        if (ret < 0)
                return ret;

        ret = fdt_setprop_string(fdt, node, "format", format);
        if (ret < 0)
                return ret;

        ret = fdt_setprop_string(fdt, node, "status", "okay");
        if (ret < 0)
                return ret;

        return 0;
}

/*
 * Update native-mode in display-timings from display environment variable.
 * The node to update are specified by path.
 */
int fdt_fixup_display(void *blob, const char *path, const char *display)
{
        int off, toff;

        if (!display || !path)
                return -FDT_ERR_NOTFOUND;

        toff = fdt_path_offset(blob, path);
        if (toff >= 0)
                toff = fdt_subnode_offset(blob, toff, "display-timings");
        if (toff < 0)
                return toff;

        for (off = fdt_first_subnode(blob, toff);
             off >= 0;
             off = fdt_next_subnode(blob, off)) {
                uint32_t h = fdt_get_phandle(blob, off);
                debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
                      fdt32_to_cpu(h));
                if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
                        return fdt_setprop_u32(blob, toff, "native-mode", h);
        }
        return toff;
}

#ifdef CONFIG_OF_LIBFDT_OVERLAY
/**
 * fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
 *
 * @fdt: ptr to device tree
 * @fdto: ptr to device tree overlay
 *
 * Convenience function to apply an overlay and display helpful messages
 * in the case of an error
 */
int fdt_overlay_apply_verbose(void *fdt, void *fdto)
{
        int err;
        bool has_symbols;

        err = fdt_path_offset(fdt, "/__symbols__");
        has_symbols = err >= 0;

        err = fdt_overlay_apply(fdt, fdto);
        if (err < 0) {
                printf("failed on fdt_overlay_apply(): %s\n",
                                fdt_strerror(err));
                if (!has_symbols) {
                        printf("base fdt does did not have a /__symbols__ node\n");
                        printf("make sure you've compiled with -@\n");
                }
        }
        return err;
}
#endif