drivers/power/pmic/rk8xx.c

   1 /*
   2  * Copyright (C) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <fdtdec.h>
  12 #include <libfdt.h>
  13 #include <power/rk8xx_pmic.h>
  14 #include <power/pmic.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 static const struct pmic_child_info pmic_children_info[] = {
  19         { .prefix = "DCDC_REG", .driver = "rk8xx_buck"},
  20         { .prefix = "LDO_REG", .driver = "rk8xx_ldo"},
  21         { .prefix = "SWITCH_REG", .driver = "rk8xx_switch"},
  22         { },
  23 };
  24
  25 static int rk8xx_reg_count(struct udevice *dev)
  26 {
  27         return RK808_NUM_OF_REGS;
  28 }
  29
  30 static int rk8xx_write(struct udevice *dev, uint reg, const uint8_t *buff,
  31                           int len)
  32 {
  33         int ret;
  34
  35         ret = dm_i2c_write(dev, reg, buff, len);
  36         if (ret) {
  37                 debug("write error to device: %p register: %#x!", dev, reg);
  38                 return ret;
  39         }
  40
  41         return 0;
  42 }
  43
  44 static int rk8xx_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  45 {
  46         int ret;
  47
  48         ret = dm_i2c_read(dev, reg, buff, len);
  49         if (ret) {
  50                 debug("read error from device: %p register: %#x!", dev, reg);
  51                 return ret;
  52         }
  53
  54         return 0;
  55 }
  56
  57 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
  58 static int rk8xx_bind(struct udevice *dev)
  59 {
  60         ofnode regulators_node;
  61         int children;
  62
  63         regulators_node = dev_read_subnode(dev, "regulators");
  64         if (!ofnode_valid(regulators_node)) {
  65                 debug("%s: %s regulators subnode not found!", __func__,
  66                       dev->name);
  67                 return -ENXIO;
  68         }
  69
  70         debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
  71
  72         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
  73         if (!children)
  74                 debug("%s: %s - no child found\n", __func__, dev->name);
  75
  76         /* Always return success for this device */
  77         return 0;
  78 }
  79 #endif
  80
  81 static int rk8xx_probe(struct udevice *dev)
  82 {
  83         struct rk8xx_priv *priv = dev_get_priv(dev);
  84         uint8_t msb, lsb;
  85
  86         /* read Chip variant */
  87         rk8xx_read(dev, ID_MSB, &msb, 1);
  88         rk8xx_read(dev, ID_LSB, &lsb, 1);
  89
  90         priv->variant = ((msb << 8) | lsb) & RK8XX_ID_MSK;
  91
  92         return 0;
  93 }
  94
  95 static struct dm_pmic_ops rk8xx_ops = {
  96         .reg_count = rk8xx_reg_count,
  97         .read = rk8xx_read,
  98         .write = rk8xx_write,
  99 };
 100
 101 static const struct udevice_id rk8xx_ids[] = {
 102         { .compatible = "rockchip,rk808" },
 103         { .compatible = "rockchip,rk818" },
 104         { }
 105 };
 106
 107 U_BOOT_DRIVER(pmic_rk8xx) = {
 108         .name = "rk8xx pmic",
 109         .id = UCLASS_PMIC,
 110         .of_match = rk8xx_ids,
 111 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
 112         .bind = rk8xx_bind,
 113 #endif
 114         .probe = rk8xx_probe,
 115         .ops = &rk8xx_ops,
 116 };