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 <power/pmic.h>
  12 #include <power/regulator.h>
  13 #include <power/pca9450.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 static const struct pmic_child_info pmic_children_info[] = {
  18         /* buck */
  19         { .prefix = "b", .driver = PCA9450_REGULATOR_DRIVER},
  20         /* ldo */
  21         { .prefix = "l", .driver = PCA9450_REGULATOR_DRIVER},
  22         { },
  23 };
  24
  25 static int pca9450_reg_count(struct udevice *dev)
  26 {
  27         return PCA9450_REG_NUM;
  28 }
  29
  30 static int pca9450_write(struct udevice *dev, uint reg, const uint8_t *buff,
  31                          int len)
  32 {
  33         if (dm_i2c_write(dev, reg, buff, len)) {
  34                 pr_err("write error to device: %p register: %#x!", dev, reg);
  35                 return -EIO;
  36         }
  37
  38         return 0;
  39 }
  40
  41 static int pca9450_read(struct udevice *dev, uint reg, uint8_t *buff,
  42                         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
  52 static int pca9450_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!", __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,
  67                                       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
  75 static struct dm_pmic_ops pca9450_ops = {
  76         .reg_count = pca9450_reg_count,
  77         .read = pca9450_read,
  78         .write = pca9450_write,
  79 };
  80
  81 static const struct udevice_id pca9450_ids[] = {
  82         { .compatible = "nxp,pca9450a", .data = 0x35, },
  83         { .compatible = "nxp,pca9450b", .data = 0x25, },
  84         { }
  85 };
  86
  87 U_BOOT_DRIVER(pmic_pca9450) = {
  88         .name = "pca9450 pmic",
  89         .id = UCLASS_PMIC,
  90         .of_match = pca9450_ids,
  91         .bind = pca9450_bind,
  92         .ops = &pca9450_ops,
  93 };