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