drivers/regulator/tps68470-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Regulator driver for TPS68470 PMIC
   4 //
   5 // Copyright (c) 2021 Red Hat Inc.
   6 // Copyright (C) 2018 Intel Corporation
   7 //
   8 // Authors:
   9 //      Hans de Goede <hdegoede@redhat.com>
  10 //      Zaikuo Wang <zaikuo.wang@intel.com>
  11 //      Tianshu Qiu <tian.shu.qiu@intel.com>
  12 //      Jian Xu Zheng <jian.xu.zheng@intel.com>
  13 //      Yuning Pu <yuning.pu@intel.com>
  14 //      Rajmohan Mani <rajmohan.mani@intel.com>
  15
  16 #include <linux/clk.h>
  17 #include <linux/device.h>
  18 #include <linux/err.h>
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mfd/tps68470.h>
  22 #include <linux/module.h>
  23 #include <linux/platform_data/tps68470.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/regulator/driver.h>
  26 #include <linux/regulator/machine.h>
  27
  28 struct tps68470_regulator_data {
  29         struct clk *clk;
  30 };
  31
  32 #define TPS68470_REGULATOR(_name, _id, _ops, _n,                        \
  33                            _vr, _vm, _er, _em, _lr, _nlr)               \
  34         [TPS68470_ ## _name] = {                                        \
  35                 .name                   = # _name,                      \
  36                 .id                     = _id,                          \
  37                 .ops                    = &_ops,                        \
  38                 .n_voltages             = _n,                           \
  39                 .type                   = REGULATOR_VOLTAGE,            \
  40                 .owner                  = THIS_MODULE,                  \
  41                 .vsel_reg               = _vr,                          \
  42                 .vsel_mask              = _vm,                          \
  43                 .enable_reg             = _er,                          \
  44                 .enable_mask            = _em,                          \
  45                 .linear_ranges          = _lr,                          \
  46                 .n_linear_ranges        = _nlr,                         \
  47         }
  48
  49 static const struct linear_range tps68470_ldo_ranges[] = {
  50         REGULATOR_LINEAR_RANGE(875000, 0, 125, 17800),
  51 };
  52
  53 static const struct linear_range tps68470_core_ranges[] = {
  54         REGULATOR_LINEAR_RANGE(900000, 0, 42, 25000),
  55 };
  56
  57 static int tps68470_regulator_enable(struct regulator_dev *rdev)
  58 {
  59         struct tps68470_regulator_data *data = rdev->reg_data;
  60         int ret;
  61
  62         /* The Core buck regulator needs the PMIC's PLL to be enabled */
  63         if (rdev->desc->id == TPS68470_CORE) {
  64                 ret = clk_prepare_enable(data->clk);
  65                 if (ret) {
  66                         dev_err(&rdev->dev, "Error enabling TPS68470 clock\n");
  67                         return ret;
  68                 }
  69         }
  70
  71         return regulator_enable_regmap(rdev);
  72 }
  73
  74 static int tps68470_regulator_disable(struct regulator_dev *rdev)
  75 {
  76         struct tps68470_regulator_data *data = rdev->reg_data;
  77
  78         if (rdev->desc->id == TPS68470_CORE)
  79                 clk_disable_unprepare(data->clk);
  80
  81         return regulator_disable_regmap(rdev);
  82 }
  83
  84 /* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
  85 static const struct regulator_ops tps68470_regulator_ops = {
  86         .is_enabled             = regulator_is_enabled_regmap,
  87         .enable                 = tps68470_regulator_enable,
  88         .disable                = tps68470_regulator_disable,
  89         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  90         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  91         .list_voltage           = regulator_list_voltage_linear_range,
  92         .map_voltage            = regulator_map_voltage_linear_range,
  93 };
  94
  95 static const struct regulator_ops tps68470_always_on_reg_ops = {
  96         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  97         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  98         .list_voltage           = regulator_list_voltage_linear_range,
  99         .map_voltage            = regulator_map_voltage_linear_range,
 100 };
 101
 102 static const struct regulator_desc regulators[] = {
 103         TPS68470_REGULATOR(CORE, TPS68470_CORE, tps68470_regulator_ops, 43,
 104                            TPS68470_REG_VDVAL, TPS68470_VDVAL_DVOLT_MASK,
 105                            TPS68470_REG_VDCTL, TPS68470_VDCTL_EN_MASK,
 106                            tps68470_core_ranges, ARRAY_SIZE(tps68470_core_ranges)),
 107         TPS68470_REGULATOR(ANA, TPS68470_ANA, tps68470_regulator_ops, 126,
 108                            TPS68470_REG_VAVAL, TPS68470_VAVAL_AVOLT_MASK,
 109                            TPS68470_REG_VACTL, TPS68470_VACTL_EN_MASK,
 110                            tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
 111         TPS68470_REGULATOR(VCM, TPS68470_VCM, tps68470_regulator_ops, 126,
 112                            TPS68470_REG_VCMVAL, TPS68470_VCMVAL_VCVOLT_MASK,
 113                            TPS68470_REG_VCMCTL, TPS68470_VCMCTL_EN_MASK,
 114                            tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
 115         TPS68470_REGULATOR(VIO, TPS68470_VIO, tps68470_always_on_reg_ops, 126,
 116                            TPS68470_REG_VIOVAL, TPS68470_VIOVAL_IOVOLT_MASK,
 117                            0, 0,
 118                            tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
 119 /*
 120  * (1) This regulator must have the same voltage as VIO if S_IO LDO is used to
 121  *     power a sensor/VCM which I2C is daisy chained behind the PMIC.
 122  * (2) If there is no I2C daisy chain it can be set freely.
 123  */
 124         TPS68470_REGULATOR(VSIO, TPS68470_VSIO, tps68470_regulator_ops, 126,
 125                            TPS68470_REG_VSIOVAL, TPS68470_VSIOVAL_IOVOLT_MASK,
 126                            TPS68470_REG_S_I2C_CTL, TPS68470_S_I2C_CTL_EN_MASK,
 127                            tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
 128         TPS68470_REGULATOR(AUX1, TPS68470_AUX1, tps68470_regulator_ops, 126,
 129                            TPS68470_REG_VAUX1VAL, TPS68470_VAUX1VAL_AUX1VOLT_MASK,
 130                            TPS68470_REG_VAUX1CTL, TPS68470_VAUX1CTL_EN_MASK,
 131                            tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
 132         TPS68470_REGULATOR(AUX2, TPS68470_AUX2, tps68470_regulator_ops, 126,
 133                            TPS68470_REG_VAUX2VAL, TPS68470_VAUX2VAL_AUX2VOLT_MASK,
 134                            TPS68470_REG_VAUX2CTL, TPS68470_VAUX2CTL_EN_MASK,
 135                            tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
 136 };
 137
 138 static int tps68470_regulator_probe(struct platform_device *pdev)
 139 {
 140         struct device *dev = &pdev->dev;
 141         struct tps68470_regulator_platform_data *pdata = dev_get_platdata(dev);
 142         struct tps68470_regulator_data *data;
 143         struct regulator_config config = { };
 144         struct regulator_dev *rdev;
 145         int i;
 146
 147         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 148         if (!data)
 149                 return -ENOMEM;
 150
 151         data->clk = devm_clk_get(dev, "tps68470-clk");
 152         if (IS_ERR(data->clk))
 153                 return dev_err_probe(dev, PTR_ERR(data->clk), "getting tps68470-clk\n");
 154
 155         config.dev = dev->parent;
 156         config.regmap = dev_get_drvdata(dev->parent);
 157         config.driver_data = data;
 158
 159         for (i = 0; i < TPS68470_NUM_REGULATORS; i++) {
 160                 if (pdata)
 161                         config.init_data = pdata->reg_init_data[i];
 162                 else
 163                         config.init_data = NULL;
 164
 165                 rdev = devm_regulator_register(dev, &regulators[i], &config);
 166                 if (IS_ERR(rdev))
 167                         return dev_err_probe(dev, PTR_ERR(rdev),
 168                                              "registering %s regulator\n",
 169                                              regulators[i].name);
 170         }
 171
 172         return 0;
 173 }
 174
 175 static struct platform_driver tps68470_regulator_driver = {
 176         .driver = {
 177                 .name = "tps68470-regulator",
 178                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 179         },
 180         .probe = tps68470_regulator_probe,
 181 };
 182
 183 /*
 184  * The ACPI tps68470 probe-ordering depends on the clk/gpio/regulator drivers
 185  * registering before the drivers for the camera-sensors which use them bind.
 186  * subsys_initcall() ensures this when the drivers are builtin.
 187  */
 188 static int __init tps68470_regulator_init(void)
 189 {
 190         return platform_driver_register(&tps68470_regulator_driver);
 191 }
 192 subsys_initcall(tps68470_regulator_init);
 193
 194 static void __exit tps68470_regulator_exit(void)
 195 {
 196         platform_driver_unregister(&tps68470_regulator_driver);
 197 }
 198 module_exit(tps68470_regulator_exit);
 199
 200 MODULE_ALIAS("platform:tps68470-regulator");
 201 MODULE_DESCRIPTION("TPS68470 voltage regulator driver");
 202 MODULE_LICENSE("GPL v2");