drivers/power/pmic/pca9450.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2019 NXP
   4  */
   5
   6 #include <common.h>
   7 #include <fdtdec.h>
   8 #include <errno.h>
   9 #include <dm.h>
  10 #include <i2c.h>
  11 #include <log.h>
  12 #include <power/pmic.h>
  13 #include <power/regulator.h>
  14 #include <power/pca9450.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 static const struct pmic_child_info pmic_children_info[] = {
  19         /* buck */
  20         { .prefix = "b", .driver = PCA9450_REGULATOR_DRIVER},
  21         /* ldo */
  22         { .prefix = "l", .driver = PCA9450_REGULATOR_DRIVER},
  23         { },
  24 };
  25
  26 static int pca9450_reg_count(struct udevice *dev)
  27 {
  28         return PCA9450_REG_NUM;
  29 }
  30
  31 static int pca9450_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
  42 static int pca9450_read(struct udevice *dev, uint reg, uint8_t *buff,
  43                         int len)
  44 {
  45         if (dm_i2c_read(dev, reg, buff, len)) {
  46                 pr_err("read error from device: %p register: %#x!", dev, reg);
  47                 return -EIO;
  48         }
  49
  50         return 0;
  51 }
  52
  53 static int pca9450_bind(struct udevice *dev)
  54 {
  55         int children;
  56         ofnode regulators_node;
  57
  58         regulators_node = dev_read_subnode(dev, "regulators");
  59         if (!ofnode_valid(regulators_node)) {
  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,
  68                                       pmic_children_info);
  69         if (!children)
  70                 debug("%s: %s - no child found\n", __func__, dev->name);
  71
  72         /* Always return success for this device */
  73         return 0;
  74 }
  75
  76 static struct dm_pmic_ops pca9450_ops = {
  77         .reg_count = pca9450_reg_count,
  78         .read = pca9450_read,
  79         .write = pca9450_write,
  80 };
  81
  82 static const struct udevice_id pca9450_ids[] = {
  83         { .compatible = "nxp,pca9450a", .data = 0x25, },
  84         { .compatible = "nxp,pca9450b", .data = 0x25, },
  85         { }
  86 };
  87
  88 U_BOOT_DRIVER(pmic_pca9450) = {
  89         .name = "pca9450 pmic",
  90         .id = UCLASS_PMIC,
  91         .of_match = pca9450_ids,
  92         .bind = pca9450_bind,
  93         .ops = &pca9450_ops,
  94 };