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