drivers/power/pmic/tps65090.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 <i2c.h>
  13 #include <power/pmic.h>
  14 #include <power/tps65090.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 static const struct pmic_child_info pmic_children_info[] = {
  19         { .prefix = "fet", .driver = TPS65090_FET_DRIVER },
  20         { },
  21 };
  22
  23 static int tps65090_reg_count(struct udevice *dev)
  24 {
  25         return TPS65090_NUM_REGS;
  26 }
  27
  28 static int tps65090_write(struct udevice *dev, uint reg, const uint8_t *buff,
  29                           int len)
  30 {
  31         if (dm_i2c_write(dev, reg, buff, len)) {
  32                 error("write error to device: %p register: %#x!", dev, reg);
  33                 return -EIO;
  34         }
  35
  36         return 0;
  37 }
  38
  39 static int tps65090_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                 error("read error %d from device: %p register: %#x!", ret, dev,
  46                       reg);
  47                 return -EIO;
  48         }
  49
  50         return 0;
  51 }
  52
  53 static int tps65090_bind(struct udevice *dev)
  54 {
  55         int regulators_node;
  56         const void *blob = gd->fdt_blob;
  57         int children;
  58
  59         regulators_node = fdt_subnode_offset(blob, dev_of_offset(dev),
  60                                              "regulators");
  61         if (regulators_node <= 0) {
  62                 debug("%s: %s regulators subnode not found!", __func__,
  63                       dev->name);
  64                 return -ENXIO;
  65         }
  66
  67         debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
  68
  69         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
  70         if (!children)
  71                 debug("%s: %s - no child found\n", __func__, dev->name);
  72
  73         /* Always return success for this device */
  74         return 0;
  75 }
  76
  77 static struct dm_pmic_ops tps65090_ops = {
  78         .reg_count = tps65090_reg_count,
  79         .read = tps65090_read,
  80         .write = tps65090_write,
  81 };
  82
  83 static const struct udevice_id tps65090_ids[] = {
  84         { .compatible = "ti,tps65090" },
  85         { }
  86 };
  87
  88 U_BOOT_DRIVER(pmic_tps65090) = {
  89         .name = "tps65090 pmic",
  90         .id = UCLASS_PMIC,
  91         .of_match = tps65090_ids,
  92         .bind = tps65090_bind,
  93         .ops = &tps65090_ops,
  94 };