drivers/power/pmic/palmas.c

   1 /*
   2  * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
   3  * Keerthy <j-keerthy@ti.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <fdtdec.h>
  10 #include <errno.h>
  11 #include <dm.h>
  12 #include <i2c.h>
  13 #include <power/pmic.h>
  14 #include <power/regulator.h>
  15 #include <power/palmas.h>
  16 #include <dm/device.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 static const struct pmic_child_info pmic_children_info[] = {
  21         { .prefix = "ldo", .driver = PALMAS_LDO_DRIVER },
  22         { .prefix = "smps", .driver = PALMAS_SMPS_DRIVER },
  23         { },
  24 };
  25
  26 static int palmas_write(struct udevice *dev, uint reg, const uint8_t *buff,
  27                           int len)
  28 {
  29         if (dm_i2c_write(dev, reg, buff, len)) {
  30                 error("write error to device: %p register: %#x!", dev, reg);
  31                 return -EIO;
  32         }
  33
  34         return 0;
  35 }
  36
  37 static int palmas_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  38 {
  39         if (dm_i2c_read(dev, reg, buff, len)) {
  40                 error("read error from device: %p register: %#x!", dev, reg);
  41                 return -EIO;
  42         }
  43
  44         return 0;
  45 }
  46
  47 static int palmas_bind(struct udevice *dev)
  48 {
  49         int pmic_node = -1, regulators_node;
  50         const void *blob = gd->fdt_blob;
  51         int children;
  52         int node = dev_of_offset(dev);
  53         int subnode, len;
  54
  55         fdt_for_each_subnode(subnode, blob, node) {
  56                 const char *name;
  57                 char *temp;
  58
  59                 name = fdt_get_name(blob, subnode, &len);
  60                 temp = strstr(name, "pmic");
  61                 if (temp) {
  62                         pmic_node = subnode;
  63                         break;
  64                 }
  65         }
  66
  67         if (pmic_node <= 0) {
  68                 debug("%s: %s pmic subnode not found!", __func__, dev->name);
  69                 return -ENXIO;
  70         }
  71
  72         regulators_node = fdt_subnode_offset(blob, pmic_node, "regulators");
  73
  74         if (regulators_node <= 0) {
  75                 debug("%s: %s reg subnode not found!", __func__, dev->name);
  76                 return -ENXIO;
  77         }
  78
  79         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
  80         if (!children)
  81                 debug("%s: %s - no child found\n", __func__, dev->name);
  82
  83         /* Always return success for this device */
  84         return 0;
  85 }
  86
  87 static struct dm_pmic_ops palmas_ops = {
  88         .read = palmas_read,
  89         .write = palmas_write,
  90 };
  91
  92 static const struct udevice_id palmas_ids[] = {
  93         { .compatible = "ti,tps659038", .data = TPS659038 },
  94         { .compatible = "ti,tps65917" , .data = TPS65917 },
  95         { }
  96 };
  97
  98 U_BOOT_DRIVER(pmic_palmas) = {
  99         .name = "palmas_pmic",
 100         .id = UCLASS_PMIC,
 101         .of_match = palmas_ids,
 102         .bind = palmas_bind,
 103         .ops = &palmas_ops,
 104 };