drivers/power/pmic/fan53555.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) 2018 Theobroma Systems Design und Consulting GmbH
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <log.h>
   9 #include <dm/device-internal.h>
  10 #include <dm/device_compat.h>
  11 #include <dm/lists.h>
  12 #include <i2c.h>
  13 #include <power/fan53555.h>
  14 #include <power/pmic.h>
  15 #include <power/regulator.h>
  16
  17 static int pmic_fan53555_reg_count(struct udevice *dev)
  18 {
  19         return 1;
  20 };
  21
  22 static int pmic_fan53555_read(struct udevice *dev, uint reg,
  23                               u8 *buff, int len)
  24 {
  25         if (dm_i2c_read(dev, reg, buff, len)) {
  26                 pr_err("%s: read error for register: %#x!", dev->name, reg);
  27                 return -EIO;
  28         }
  29
  30         return 0;
  31 }
  32
  33 static int pmic_fan53555_write(struct udevice *dev, uint reg,
  34                                const u8 *buff, int len)
  35 {
  36         if (dm_i2c_write(dev, reg, buff, len)) {
  37                 pr_err("%s: write error for register: %#x!", dev->name, reg);
  38                 return -EIO;
  39         }
  40
  41         return 0;
  42 }
  43
  44 static int pmic_fan53555_bind(struct udevice *dev)
  45 {
  46         /*
  47          * The FAN53555 has only a single regulator and therefore doesn't
  48          * have a subnode.  So we have to rebind a child device (the one
  49          * regulator) here.
  50          */
  51
  52         const char *regulator_driver_name = "fan53555_regulator";
  53         struct udevice *child;
  54         struct driver *drv;
  55
  56         debug("%s\n", __func__);
  57
  58         drv = lists_driver_lookup_name(regulator_driver_name);
  59         if (!drv) {
  60                 dev_err(dev, "no driver '%s'\n", regulator_driver_name);
  61                 return -ENOENT;
  62         }
  63
  64         return device_bind_with_driver_data(dev, drv, "SW", dev->driver_data,
  65                                             dev_ofnode(dev), &child);
  66 };
  67
  68 static struct dm_pmic_ops pmic_fan53555_ops = {
  69         .reg_count = pmic_fan53555_reg_count,
  70         .read = pmic_fan53555_read,
  71         .write = pmic_fan53555_write,
  72 };
  73
  74 static const struct udevice_id pmic_fan53555_match[] = {
  75         { .compatible = "fcs,fan53555", .data = FAN53555_VENDOR_FAIRCHILD, },
  76         { .compatible = "silergy,syr827", .data = FAN53555_VENDOR_SILERGY, },
  77         { .compatible = "silergy,syr828", .data = FAN53555_VENDOR_SILERGY, },
  78         { },
  79 };
  80
  81 U_BOOT_DRIVER(pmic_fan53555) = {
  82         .name = "pmic_fan53555",
  83         .id = UCLASS_PMIC,
  84         .of_match = pmic_fan53555_match,
  85         .bind = pmic_fan53555_bind,
  86         .ops = &pmic_fan53555_ops,
  87 };