drivers/power/pmic/da9063.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Copyright (C) 2018 Flowbird
   4  *  Martin Fuzzey  <martin.fuzzey@flowbird.group>
   5  */
   6
   7 #include <common.h>
   8 #include <fdtdec.h>
   9 #include <errno.h>
  10 #include <dm.h>
  11 #include <i2c.h>
  12 #include <log.h>
  13 #include <linux/printk.h>
  14 #include <power/pmic.h>
  15 #include <power/regulator.h>
  16 #include <power/da9063_pmic.h>
  17
  18 static const struct pmic_child_info pmic_children_info[] = {
  19         { .prefix = "ldo", .driver = DA9063_LDO_DRIVER },
  20         { .prefix = "b", .driver = DA9063_BUCK_DRIVER },
  21         { },
  22 };
  23
  24 /*
  25  * The register map is non contiguous and attempts to read in the holes fail.
  26  * But "pmic dump" tries to dump the full register map.
  27  * So define the holes here so we can fix that.
  28  */
  29 struct da9063_reg_hole {
  30         u16     first;
  31         u16     last;
  32 };
  33
  34 static const struct da9063_reg_hole da9063_reg_holes[] = {
  35         DA9063_REG_HOLE_1,
  36         DA9063_REG_HOLE_2,
  37         DA9063_REG_HOLE_3,
  38         /* These aren't readable. I can't see why from the datasheet but
  39          * attempts to read fail and the kernel marks them unreadable too,
  40          */
  41         {DA9063_REG_OTP_COUNT, DA9063_REG_OTP_DATA},
  42 };
  43
  44 static int da9063_reg_count(struct udevice *dev)
  45 {
  46         return DA9063_NUM_OF_REGS;
  47 }
  48
  49 static bool da9063_reg_valid(uint reg)
  50 {
  51         int i;
  52
  53         for (i = 0; i < ARRAY_SIZE(da9063_reg_holes); i++) {
  54                 const struct da9063_reg_hole *hole = &da9063_reg_holes[i];
  55
  56                 if (reg >= hole->first && reg <= hole->last)
  57                         return false;
  58         }
  59
  60         return true;
  61 }
  62
  63 static int da9063_write(struct udevice *dev, uint reg, const uint8_t *buff,
  64                         int len)
  65 {
  66         if (dm_i2c_write(dev, reg, buff, len)) {
  67                 pr_err("write error to device: %p register: %#x!", dev, reg);
  68                 return -EIO;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static int da9063_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  75 {
  76         if (!da9063_reg_valid(reg))
  77                 return -ENODATA;
  78
  79         if (dm_i2c_read(dev, reg, buff, len)) {
  80                 pr_err("read error from device: %p register: %#x!", dev, reg);
  81                 return -EIO;
  82         }
  83
  84         return 0;
  85 }
  86
  87 static int da9063_bind(struct udevice *dev)
  88 {
  89         ofnode regulators_node;
  90         int children;
  91
  92         regulators_node = dev_read_subnode(dev, "regulators");
  93         if (!ofnode_valid(regulators_node)) {
  94                 debug("%s: %s regulators subnode not found!", __func__,
  95                       dev->name);
  96                 return -ENXIO;
  97         }
  98
  99         debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
 100
 101         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
 102         if (!children)
 103                 debug("%s: %s - no child found\n", __func__, dev->name);
 104
 105         /* Always return success for this device */
 106         return 0;
 107 }
 108
 109 static int da9063_probe(struct udevice *dev)
 110 {
 111         return i2c_set_chip_addr_offset_mask(dev, 0x1);
 112 }
 113
 114 static struct dm_pmic_ops da9063_ops = {
 115         .reg_count = da9063_reg_count,
 116         .read = da9063_read,
 117         .write = da9063_write,
 118 };
 119
 120 static const struct udevice_id da9063_ids[] = {
 121         { .compatible = "dlg,da9063" },
 122         { }
 123 };
 124
 125 U_BOOT_DRIVER(pmic_da9063) = {
 126         .name = "da9063_pmic",
 127         .id = UCLASS_PMIC,
 128         .of_match = da9063_ids,
 129         .bind = da9063_bind,
 130         .probe = da9063_probe,
 131         .ops = &da9063_ops,
 132 };