LXR uboot/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
  17DECLARE_GLOBAL_DATA_PTR;
  18
  19static 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
  25static int max77686_reg_count(struct udevice *dev)
  26{
  27        return MAX77686_NUM_OF_REGS;
  28}
  29
  30static 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
  41static 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
  51static 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
  75static struct dm_pmic_ops max77686_ops = {
  76        .reg_count = max77686_reg_count,
  77        .read = max77686_read,
  78        .write = max77686_write,
  79};
  80
  81static const struct udevice_id max77686_ids[] = {
  82        { .compatible = "maxim,max77686" },
  83        { }
  84};
  85
  86U_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};
  93