drivers/clk/at91/pmc.c

   1 /*
   2  * Copyright (C) 2016 Atmel Corporation
   3  *               Wenyou.Yang <wenyou.yang@atmel.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <clk-uclass.h>
  10 #include <dm.h>
  11 #include <dm/lists.h>
  12 #include <dm/util.h>
  13 #include "pmc.h"
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 static const struct udevice_id at91_pmc_match[] = {
  18         { .compatible = "atmel,at91rm9200-pmc" },
  19         { .compatible = "atmel,at91sam9260-pmc" },
  20         { .compatible = "atmel,at91sam9g45-pmc" },
  21         { .compatible = "atmel,at91sam9n12-pmc" },
  22         { .compatible = "atmel,at91sam9x5-pmc" },
  23         { .compatible = "atmel,sama5d3-pmc" },
  24         { .compatible = "atmel,sama5d2-pmc" },
  25         {}
  26 };
  27
  28 U_BOOT_DRIVER(at91_pmc) = {
  29         .name = "at91-pmc",
  30         .id = UCLASS_SIMPLE_BUS,
  31         .of_match = at91_pmc_match,
  32 };
  33
  34 /*---------------------------------------------------------*/
  35
  36 int at91_pmc_core_probe(struct udevice *dev)
  37 {
  38         struct pmc_platdata *plat = dev_get_platdata(dev);
  39
  40         dev = dev_get_parent(dev);
  41
  42         plat->reg_base = (struct at91_pmc *)devfdt_get_addr_ptr(dev);
  43
  44         return 0;
  45 }
  46
  47 /**
  48  * at91_clk_sub_device_bind() - for the at91 clock driver
  49  * Recursively bind its children as clk devices.
  50  *
  51  * @return: 0 on success, or negative error code on failure
  52  */
  53 int at91_clk_sub_device_bind(struct udevice *dev, const char *drv_name)
  54 {
  55         const void *fdt = gd->fdt_blob;
  56         int offset = dev_of_offset(dev);
  57         bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
  58         const char *name;
  59         int ret;
  60
  61         for (offset = fdt_first_subnode(fdt, offset);
  62              offset > 0;
  63              offset = fdt_next_subnode(fdt, offset)) {
  64                 if (pre_reloc_only &&
  65                     !dm_fdt_pre_reloc(fdt, offset))
  66                         continue;
  67                 /*
  68                  * If this node has "compatible" property, this is not
  69                  * a clock sub-node, but a normal device. skip.
  70                  */
  71                 fdt_get_property(fdt, offset, "compatible", &ret);
  72                 if (ret >= 0)
  73                         continue;
  74
  75                 if (ret != -FDT_ERR_NOTFOUND)
  76                         return ret;
  77
  78                 name = fdt_get_name(fdt, offset, NULL);
  79                 if (!name)
  80                         return -EINVAL;
  81                 ret = device_bind_driver_to_node(dev, drv_name, name,
  82                                                  offset, NULL);
  83                 if (ret)
  84                         return ret;
  85         }
  86
  87         return 0;
  88 }
  89
  90 int at91_clk_of_xlate(struct clk *clk, struct fdtdec_phandle_args *args)
  91 {
  92         int periph;
  93
  94         if (args->args_count) {
  95                 debug("Invalid args_count: %d\n", args->args_count);
  96                 return -EINVAL;
  97         }
  98
  99         periph = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(clk->dev), "reg",
 100                                  -1);
 101         if (periph < 0)
 102                 return -EINVAL;
 103
 104         clk->id = periph;
 105
 106         return 0;
 107 }
 108
 109 int at91_clk_probe(struct udevice *dev)
 110 {
 111         struct udevice *dev_periph_container, *dev_pmc;
 112         struct pmc_platdata *plat = dev_get_platdata(dev);
 113
 114         dev_periph_container = dev_get_parent(dev);
 115         dev_pmc = dev_get_parent(dev_periph_container);
 116
 117         plat->reg_base = (struct at91_pmc *)devfdt_get_addr_ptr(dev_pmc);
 118
 119         return 0;
 120 }