drivers/power/pmic/rk8xx.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <power/rk8xx_pmic.h>
  11 #include <power/pmic.h>
  12
  13 static const struct pmic_child_info pmic_children_info[] = {
  14         { .prefix = "DCDC_REG", .driver = "rk8xx_buck"},
  15         { .prefix = "LDO_REG", .driver = "rk8xx_ldo"},
  16         { .prefix = "SWITCH_REG", .driver = "rk8xx_switch"},
  17         { },
  18 };
  19
  20 static int rk8xx_reg_count(struct udevice *dev)
  21 {
  22         return RK808_NUM_OF_REGS;
  23 }
  24
  25 static int rk8xx_write(struct udevice *dev, uint reg, const uint8_t *buff,
  26                           int len)
  27 {
  28         int ret;
  29
  30         ret = dm_i2c_write(dev, reg, buff, len);
  31         if (ret) {
  32                 debug("write error to device: %p register: %#x!\n", dev, reg);
  33                 return ret;
  34         }
  35
  36         return 0;
  37 }
  38
  39 static int rk8xx_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  40 {
  41         int ret;
  42
  43         ret = dm_i2c_read(dev, reg, buff, len);
  44         if (ret) {
  45                 debug("read error from device: %p register: %#x!\n", dev, reg);
  46                 return ret;
  47         }
  48
  49         return 0;
  50 }
  51
  52 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
  53 static int rk8xx_bind(struct udevice *dev)
  54 {
  55         ofnode regulators_node;
  56         int children;
  57
  58         regulators_node = dev_read_subnode(dev, "regulators");
  59         if (!ofnode_valid(regulators_node)) {
  60                 debug("%s: %s regulators subnode not found!\n", __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 #endif
  75
  76 static int rk8xx_probe(struct udevice *dev)
  77 {
  78         struct rk8xx_priv *priv = dev_get_priv(dev);
  79         uint8_t msb, lsb;
  80
  81         /* read Chip variant */
  82         rk8xx_read(dev, ID_MSB, &msb, 1);
  83         rk8xx_read(dev, ID_LSB, &lsb, 1);
  84
  85         priv->variant = ((msb << 8) | lsb) & RK8XX_ID_MSK;
  86
  87         return 0;
  88 }
  89
  90 static struct dm_pmic_ops rk8xx_ops = {
  91         .reg_count = rk8xx_reg_count,
  92         .read = rk8xx_read,
  93         .write = rk8xx_write,
  94 };
  95
  96 static const struct udevice_id rk8xx_ids[] = {
  97         { .compatible = "rockchip,rk808" },
  98         { .compatible = "rockchip,rk816" },
  99         { .compatible = "rockchip,rk818" },
 100         { }
 101 };
 102
 103 U_BOOT_DRIVER(pmic_rk8xx) = {
 104         .name = "rk8xx pmic",
 105         .id = UCLASS_PMIC,
 106         .of_match = rk8xx_ids,
 107 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
 108         .bind = rk8xx_bind,
 109 #endif
 110         .priv_auto_alloc_size   = sizeof(struct rk8xx_priv),
 111         .probe = rk8xx_probe,
 112         .ops = &rk8xx_ops,
 113 };