LXR uboot/drivers/power/pmic/bd71837.c

   1// SPDX-License-Identifier:      GPL-2.0+
   2/*
   3 * Copyright 2018 NXP
   4 */
   5
   6#include <common.h>
   7#include <errno.h>
   8#include <dm.h>
   9#include <i2c.h>
  10#include <log.h>
  11#include <asm/global_data.h>
  12#include <power/pmic.h>
  13#include <power/regulator.h>
  14#include <power/bd71837.h>
  15
  16DECLARE_GLOBAL_DATA_PTR;
  17
  18static const struct pmic_child_info pmic_children_info[] = {
  19        /* buck */
  20        { .prefix = "b", .driver = BD718XX_REGULATOR_DRIVER},
  21        /* ldo */
  22        { .prefix = "l", .driver = BD718XX_REGULATOR_DRIVER},
  23        { },
  24};
  25
  26static int bd71837_reg_count(struct udevice *dev)
  27{
  28        return BD718XX_MAX_REGISTER - 1;
  29}
  30
  31static int bd71837_write(struct udevice *dev, uint reg, const uint8_t *buff,
  32                         int len)
  33{
  34        if (dm_i2c_write(dev, reg, buff, len)) {
  35                pr_err("write error to device: %p register: %#x!", dev, reg);
  36                return -EIO;
  37        }
  38
  39        return 0;
  40}
  41
  42static int bd71837_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  43{
  44        if (dm_i2c_read(dev, reg, buff, len)) {
  45                pr_err("read error from device: %p register: %#x!", dev, reg);
  46                return -EIO;
  47        }
  48
  49        return 0;
  50}
  51
  52static int bd71837_bind(struct udevice *dev)
  53{
  54        int children;
  55        ofnode regulators_node;
  56
  57        regulators_node = dev_read_subnode(dev, "regulators");
  58        if (!ofnode_valid(regulators_node)) {
  59                debug("%s: %s regulators subnode not found!\n", __func__,
  60                      dev->name);
  61                return -ENXIO;
  62        }
  63
  64        debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
  65
  66        children = pmic_bind_children(dev, regulators_node, pmic_children_info);
  67        if (!children)
  68                debug("%s: %s - no child found\n", __func__, dev->name);
  69
  70        /* Always return success for this device */
  71        return 0;
  72}
  73
  74static int bd718x7_probe(struct udevice *dev)
  75{
  76        int ret;
  77        uint8_t mask = BD718XX_REGLOCK_PWRSEQ | BD718XX_REGLOCK_VREG;
  78
  79        /* Unlock the PMIC regulator control before probing the children */
  80        ret = pmic_clrsetbits(dev, BD718XX_REGLOCK, mask, 0);
  81        if (ret) {
  82                debug("%s: %s Failed to unlock regulator control\n", __func__,
  83                      dev->name);
  84                return ret;
  85        }
  86        debug("%s: '%s' - BD718x7 PMIC registers unlocked\n", __func__,
  87              dev->name);
  88
  89        return 0;
  90}
  91
  92static struct dm_pmic_ops bd71837_ops = {
  93        .reg_count = bd71837_reg_count,
  94        .read = bd71837_read,
  95        .write = bd71837_write,
  96};
  97
  98static const struct udevice_id bd71837_ids[] = {
  99        { .compatible = "rohm,bd71837", .data = ROHM_CHIP_TYPE_BD71837, },
 100        { .compatible = "rohm,bd71847", .data = ROHM_CHIP_TYPE_BD71847, },
 101        { }
 102};
 103
 104U_BOOT_DRIVER(pmic_bd71837) = {
 105        .name = "bd71837 pmic",
 106        .id = UCLASS_PMIC,
 107        .of_match = bd71837_ids,
 108        .bind = bd71837_bind,
 109        .probe = bd718x7_probe,
 110        .ops = &bd71837_ops,
 111};
 112