drivers/power/pmic/stpmu1.c

   1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
   2 /*
   3  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <errno.h>
   9 #include <i2c.h>
  10 #include <power/pmic.h>
  11 #include <power/stpmu1.h>
  12
  13 #define STMPU1_NUM_OF_REGS 0x100
  14
  15 #ifndef CONFIG_SPL_BUILD
  16 static const struct pmic_child_info stpmu1_children_info[] = {
  17         { .prefix = "ldo", .driver = "stpmu1_ldo" },
  18         { .prefix = "buck", .driver = "stpmu1_buck" },
  19         { .prefix = "vref_ddr", .driver = "stpmu1_vref_ddr" },
  20         { .prefix = "pwr_sw", .driver = "stpmu1_pwr_sw" },
  21         { .prefix = "boost", .driver = "stpmu1_boost" },
  22         { },
  23 };
  24 #endif /* CONFIG_SPL_BUILD */
  25
  26 static int stpmu1_reg_count(struct udevice *dev)
  27 {
  28         return STMPU1_NUM_OF_REGS;
  29 }
  30
  31 static int stpmu1_write(struct udevice *dev, uint reg, const uint8_t *buff,
  32                         int len)
  33 {
  34         int ret;
  35
  36         ret = dm_i2c_write(dev, reg, buff, len);
  37         if (ret)
  38                 dev_err(dev, "%s: failed to write register %#x :%d",
  39                         __func__, reg, ret);
  40
  41         return ret;
  42 }
  43
  44 static int stpmu1_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  45 {
  46         int ret;
  47
  48         ret = dm_i2c_read(dev, reg, buff, len);
  49         if (ret)
  50                 dev_err(dev, "%s: failed to read register %#x : %d",
  51                         __func__, reg, ret);
  52
  53         return ret;
  54 }
  55
  56 static int stpmu1_bind(struct udevice *dev)
  57 {
  58 #ifndef CONFIG_SPL_BUILD
  59         ofnode regulators_node;
  60         int children;
  61
  62         regulators_node = dev_read_subnode(dev, "regulators");
  63         if (!ofnode_valid(regulators_node)) {
  64                 dev_dbg(dev, "regulators subnode not found!\n");
  65                 return -ENXIO;
  66         }
  67         dev_dbg(dev, "found regulators subnode\n");
  68
  69         children = pmic_bind_children(dev, regulators_node,
  70                                       stpmu1_children_info);
  71         if (!children)
  72                 dev_dbg(dev, "no child found\n");
  73 #endif /* CONFIG_SPL_BUILD */
  74
  75         return 0;
  76 }
  77
  78 static struct dm_pmic_ops stpmu1_ops = {
  79         .reg_count = stpmu1_reg_count,
  80         .read = stpmu1_read,
  81         .write = stpmu1_write,
  82 };
  83
  84 static const struct udevice_id stpmu1_ids[] = {
  85         { .compatible = "st,stpmu1" },
  86         { }
  87 };
  88
  89 U_BOOT_DRIVER(pmic_stpmu1) = {
  90         .name = "stpmu1_pmic",
  91         .id = UCLASS_PMIC,
  92         .of_match = stpmu1_ids,
  93         .bind = stpmu1_bind,
  94         .ops = &stpmu1_ops,
  95 };