drivers/power/pmic/tps65090.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <fdtdec.h>
  11 #include <i2c.h>
  12 #include <log.h>
  13 #include <power/pmic.h>
  14 #include <power/tps65090.h>
  15
  16 static const struct pmic_child_info pmic_children_info[] = {
  17         { .prefix = "fet", .driver = TPS65090_FET_DRIVER },
  18         { },
  19 };
  20
  21 static int tps65090_reg_count(struct udevice *dev)
  22 {
  23         return TPS65090_NUM_REGS;
  24 }
  25
  26 static int tps65090_write(struct udevice *dev, uint reg, const uint8_t *buff,
  27                           int len)
  28 {
  29         if (dm_i2c_write(dev, reg, buff, len)) {
  30                 pr_err("write error to device: %p register: %#x!\n", dev, reg);
  31                 return -EIO;
  32         }
  33
  34         return 0;
  35 }
  36
  37 static int tps65090_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  38 {
  39         int ret;
  40
  41         ret = dm_i2c_read(dev, reg, buff, len);
  42         if (ret) {
  43                 pr_err("read error %d from device: %p register: %#x!\n", ret,
  44                        dev, reg);
  45                 return -EIO;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static int tps65090_bind(struct udevice *dev)
  52 {
  53         ofnode regulators_node;
  54         int children;
  55
  56         regulators_node = dev_read_subnode(dev, "regulators");
  57         if (!ofnode_valid(regulators_node)) {
  58                 debug("%s: %s regulators subnode not found!\n", __func__,
  59                       dev->name);
  60                 return -ENXIO;
  61         }
  62
  63         debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
  64
  65         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
  66         if (!children)
  67                 debug("%s: %s - no child found\n", __func__, dev->name);
  68
  69         /* Always return success for this device */
  70         return 0;
  71 }
  72
  73 static struct dm_pmic_ops tps65090_ops = {
  74         .reg_count = tps65090_reg_count,
  75         .read = tps65090_read,
  76         .write = tps65090_write,
  77 };
  78
  79 static const struct udevice_id tps65090_ids[] = {
  80         { .compatible = "ti,tps65090" },
  81         { }
  82 };
  83
  84 U_BOOT_DRIVER(pmic_tps65090) = {
  85         .name = "tps65090 pmic",
  86         .id = UCLASS_PMIC,
  87         .of_match = tps65090_ids,
  88         .bind = tps65090_bind,
  89         .ops = &tps65090_ops,
  90 };