drivers/power/pmic/max77686.c

   1 /*
   2  *  Copyright (C) 2014-2015 Samsung Electronics
   3  *  Przemyslaw Marczak  <p.marczak@samsung.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <fdtdec.h>
  10 #include <errno.h>
  11 #include <dm.h>
  12 #include <i2c.h>
  13 #include <power/pmic.h>
  14 #include <power/regulator.h>
  15 #include <power/max77686_pmic.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 static const struct pmic_child_info pmic_children_info[] = {
  20         { .prefix = "LDO", .driver = MAX77686_LDO_DRIVER },
  21         { .prefix = "BUCK", .driver = MAX77686_BUCK_DRIVER },
  22         { },
  23 };
  24
  25 static int max77686_reg_count(struct udevice *dev)
  26 {
  27         return MAX77686_NUM_OF_REGS;
  28 }
  29
  30 static int max77686_write(struct udevice *dev, uint reg, const uint8_t *buff,
  31                           int len)
  32 {
  33         if (dm_i2c_write(dev, reg, buff, len)) {
  34                 error("write error to device: %p register: %#x!", dev, reg);
  35                 return -EIO;
  36         }
  37
  38         return 0;
  39 }
  40
  41 static int max77686_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  42 {
  43         if (dm_i2c_read(dev, reg, buff, len)) {
  44                 error("read error from device: %p register: %#x!", dev, reg);
  45                 return -EIO;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static int max77686_bind(struct udevice *dev)
  52 {
  53         int regulators_node;
  54         const void *blob = gd->fdt_blob;
  55         int children;
  56
  57         regulators_node = fdt_subnode_offset(blob, dev->of_offset,
  58                                              "voltage-regulators");
  59         if (regulators_node <= 0) {
  60                 debug("%s: %s regulators subnode not found!", __func__,
  61                                                              dev->name);
  62                 return -ENXIO;
  63         }
  64
  65         debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
  66
  67         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
  68         if (!children)
  69                 debug("%s: %s - no child found\n", __func__, dev->name);
  70
  71         /* Always return success for this device */
  72         return 0;
  73 }
  74
  75 static struct dm_pmic_ops max77686_ops = {
  76         .reg_count = max77686_reg_count,
  77         .read = max77686_read,
  78         .write = max77686_write,
  79 };
  80
  81 static const struct udevice_id max77686_ids[] = {
  82         { .compatible = "maxim,max77686" },
  83         { }
  84 };
  85
  86 U_BOOT_DRIVER(pmic_max77686) = {
  87         .name = "max77686_pmic",
  88         .id = UCLASS_PMIC,
  89         .of_match = max77686_ids,
  90         .bind = max77686_bind,
  91         .ops = &max77686_ops,
  92 };