drivers/regulator/rn5t618-regulator.c

   1 /*
   2  * Regulator driver for Ricoh RN5T618 PMIC
   3  *
   4  * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * You should have received a copy of the GNU General Public License
  11  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  12  */
  13
  14 #include <linux/mfd/rn5t618.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/driver.h>
  20 #include <linux/regulator/of_regulator.h>
  21
  22 static struct regulator_ops rn5t618_reg_ops = {
  23         .enable                 = regulator_enable_regmap,
  24         .disable                = regulator_disable_regmap,
  25         .is_enabled             = regulator_is_enabled_regmap,
  26         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  27         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  28         .list_voltage           = regulator_list_voltage_linear,
  29 };
  30
  31 #define REG(rid, ereg, emask, vreg, vmask, min, max, step)              \
  32         [RN5T618_##rid] = {                                             \
  33                 .name           = #rid,                                 \
  34                 .id             = RN5T618_##rid,                        \
  35                 .type           = REGULATOR_VOLTAGE,                    \
  36                 .owner          = THIS_MODULE,                          \
  37                 .ops            = &rn5t618_reg_ops,                     \
  38                 .n_voltages     = ((max) - (min)) / (step) + 1,         \
  39                 .min_uV         = (min),                                \
  40                 .uV_step        = (step),                               \
  41                 .enable_reg     = RN5T618_##ereg,                       \
  42                 .enable_mask    = (emask),                              \
  43                 .vsel_reg       = RN5T618_##vreg,                       \
  44                 .vsel_mask      = (vmask),                              \
  45         }
  46
  47 static struct regulator_desc rn5t618_regulators[] = {
  48         /* DCDC */
  49         REG(DCDC1, DC1CTL, BIT(0), DC1DAC, 0xff, 600000, 3500000, 12500),
  50         REG(DCDC2, DC2CTL, BIT(0), DC2DAC, 0xff, 600000, 3500000, 12500),
  51         REG(DCDC3, DC3CTL, BIT(0), DC3DAC, 0xff, 600000, 3500000, 12500),
  52         /* LDO */
  53         REG(LDO1, LDOEN1, BIT(0), LDO1DAC, 0x7f, 900000, 3500000, 25000),
  54         REG(LDO2, LDOEN1, BIT(1), LDO2DAC, 0x7f, 900000, 3500000, 25000),
  55         REG(LDO3, LDOEN1, BIT(2), LDO3DAC, 0x7f, 600000, 3500000, 25000),
  56         REG(LDO4, LDOEN1, BIT(3), LDO4DAC, 0x7f, 900000, 3500000, 25000),
  57         REG(LDO5, LDOEN1, BIT(4), LDO5DAC, 0x7f, 900000, 3500000, 25000),
  58         /* LDO RTC */
  59         REG(LDORTC1, LDOEN2, BIT(4), LDORTCDAC, 0x7f, 1700000, 3500000, 25000),
  60         REG(LDORTC2, LDOEN2, BIT(5), LDORTC2DAC, 0x7f, 900000, 3500000, 25000),
  61 };
  62
  63 static struct of_regulator_match rn5t618_matches[] = {
  64         [RN5T618_DCDC1]         = { .name = "DCDC1" },
  65         [RN5T618_DCDC2]         = { .name = "DCDC2" },
  66         [RN5T618_DCDC3]         = { .name = "DCDC3" },
  67         [RN5T618_LDO1]          = { .name = "LDO1" },
  68         [RN5T618_LDO2]          = { .name = "LDO2" },
  69         [RN5T618_LDO3]          = { .name = "LDO3" },
  70         [RN5T618_LDO4]          = { .name = "LDO4" },
  71         [RN5T618_LDO5]          = { .name = "LDO5" },
  72         [RN5T618_LDORTC1]       = { .name = "LDORTC1" },
  73         [RN5T618_LDORTC2]       = { .name = "LDORTC2" },
  74 };
  75
  76 static int rn5t618_regulator_parse_dt(struct platform_device *pdev)
  77 {
  78         struct device_node *np, *regulators;
  79         int ret;
  80
  81         np = of_node_get(pdev->dev.parent->of_node);
  82         if (!np)
  83                 return 0;
  84
  85         regulators = of_get_child_by_name(np, "regulators");
  86         if (!regulators) {
  87                 dev_err(&pdev->dev, "regulators node not found\n");
  88                 return -EINVAL;
  89         }
  90
  91         ret = of_regulator_match(&pdev->dev, regulators, rn5t618_matches,
  92                                  ARRAY_SIZE(rn5t618_matches));
  93         of_node_put(regulators);
  94         if (ret < 0) {
  95                 dev_err(&pdev->dev, "error parsing regulator init data: %d\n",
  96                         ret);
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int rn5t618_regulator_probe(struct platform_device *pdev)
 103 {
 104         struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
 105         struct regulator_config config = { };
 106         struct regulator_dev *rdev;
 107         int ret, i;
 108
 109         ret = rn5t618_regulator_parse_dt(pdev);
 110         if (ret)
 111                 return ret;
 112
 113         for (i = 0; i < RN5T618_REG_NUM; i++) {
 114                 config.dev = &pdev->dev;
 115                 config.init_data = rn5t618_matches[i].init_data;
 116                 config.of_node = rn5t618_matches[i].of_node;
 117                 config.regmap = rn5t618->regmap;
 118
 119                 rdev = devm_regulator_register(&pdev->dev,
 120                                                &rn5t618_regulators[i],
 121                                                &config);
 122                 if (IS_ERR(rdev)) {
 123                         dev_err(&pdev->dev, "failed to register %s regulator\n",
 124                                 rn5t618_regulators[i].name);
 125                         return PTR_ERR(rdev);
 126                 }
 127         }
 128
 129         return 0;
 130 }
 131
 132 static struct platform_driver rn5t618_regulator_driver = {
 133         .probe = rn5t618_regulator_probe,
 134         .driver = {
 135                 .name   = "rn5t618-regulator",
 136         },
 137 };
 138
 139 module_platform_driver(rn5t618_regulator_driver);
 140
 141 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
 142 MODULE_DESCRIPTION("RN5T618 regulator driver");
 143 MODULE_LICENSE("GPL v2");