drivers/regulator/bd9576-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2020 ROHM Semiconductors
   3 // ROHM BD9576MUF/BD9573MUF regulator driver
   4
   5 #include <linux/delay.h>
   6 #include <linux/err.h>
   7 #include <linux/gpio/consumer.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mfd/rohm-bd957x.h>
  11 #include <linux/mfd/rohm-generic.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/driver.h>
  16 #include <linux/regulator/machine.h>
  17 #include <linux/regulator/of_regulator.h>
  18 #include <linux/slab.h>
  19
  20 #define BD957X_VOUTS1_VOLT      3300000
  21 #define BD957X_VOUTS4_BASE_VOLT 1030000
  22 #define BD957X_VOUTS34_NUM_VOLT 32
  23
  24 static int vout1_volt_table[] = {5000000, 4900000, 4800000, 4700000, 4600000,
  25                                  4500000, 4500000, 4500000, 5000000, 5100000,
  26                                  5200000, 5300000, 5400000, 5500000, 5500000,
  27                                  5500000};
  28
  29 static int vout2_volt_table[] = {1800000, 1780000, 1760000, 1740000, 1720000,
  30                                  1700000, 1680000, 1660000, 1800000, 1820000,
  31                                  1840000, 1860000, 1880000, 1900000, 1920000,
  32                                  1940000};
  33
  34 static int voutl1_volt_table[] = {2500000, 2540000, 2580000, 2620000, 2660000,
  35                                   2700000, 2740000, 2780000, 2500000, 2460000,
  36                                   2420000, 2380000, 2340000, 2300000, 2260000,
  37                                   2220000};
  38
  39 struct bd957x_regulator_data {
  40         struct regulator_desc desc;
  41         int base_voltage;
  42 };
  43
  44 static int bd957x_vout34_list_voltage(struct regulator_dev *rdev,
  45                                       unsigned int selector)
  46 {
  47         const struct regulator_desc *desc = rdev->desc;
  48         int multiplier = selector & desc->vsel_mask & 0x7f;
  49         int tune;
  50
  51         /* VOUT3 and 4 has 10mV step */
  52         tune = multiplier * 10000;
  53
  54         if (!(selector & 0x80))
  55                 return desc->fixed_uV - tune;
  56
  57         return desc->fixed_uV + tune;
  58 }
  59
  60 static int bd957x_list_voltage(struct regulator_dev *rdev,
  61                                unsigned int selector)
  62 {
  63         const struct regulator_desc *desc = rdev->desc;
  64         int index = selector & desc->vsel_mask & 0x7f;
  65
  66         if (!(selector & 0x80))
  67                 index += desc->n_voltages/2;
  68
  69         if (index >= desc->n_voltages)
  70                 return -EINVAL;
  71
  72         return desc->volt_table[index];
  73 }
  74
  75 static const struct regulator_ops bd957x_vout34_ops = {
  76         .is_enabled = regulator_is_enabled_regmap,
  77         .list_voltage = bd957x_vout34_list_voltage,
  78         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  79 };
  80
  81 static const struct regulator_ops bd957X_vouts1_regulator_ops = {
  82         .is_enabled = regulator_is_enabled_regmap,
  83 };
  84
  85 static const struct regulator_ops bd957x_ops = {
  86         .is_enabled = regulator_is_enabled_regmap,
  87         .list_voltage = bd957x_list_voltage,
  88         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  89 };
  90
  91 static struct bd957x_regulator_data bd9576_regulators[] = {
  92         {
  93                 .desc = {
  94                         .name = "VD50",
  95                         .of_match = of_match_ptr("regulator-vd50"),
  96                         .regulators_node = of_match_ptr("regulators"),
  97                         .id = BD957X_VD50,
  98                         .type = REGULATOR_VOLTAGE,
  99                         .ops = &bd957x_ops,
 100                         .volt_table = &vout1_volt_table[0],
 101                         .n_voltages = ARRAY_SIZE(vout1_volt_table),
 102                         .vsel_reg = BD957X_REG_VOUT1_TUNE,
 103                         .vsel_mask = BD957X_MASK_VOUT1_TUNE,
 104                         .enable_reg = BD957X_REG_POW_TRIGGER1,
 105                         .enable_mask = BD957X_REGULATOR_EN_MASK,
 106                         .enable_val = BD957X_REGULATOR_DIS_VAL,
 107                         .enable_is_inverted = true,
 108                         .owner = THIS_MODULE,
 109                 },
 110         },
 111         {
 112                 .desc = {
 113                         .name = "VD18",
 114                         .of_match = of_match_ptr("regulator-vd18"),
 115                         .regulators_node = of_match_ptr("regulators"),
 116                         .id = BD957X_VD18,
 117                         .type = REGULATOR_VOLTAGE,
 118                         .ops = &bd957x_ops,
 119                         .volt_table = &vout2_volt_table[0],
 120                         .n_voltages = ARRAY_SIZE(vout2_volt_table),
 121                         .vsel_reg = BD957X_REG_VOUT2_TUNE,
 122                         .vsel_mask = BD957X_MASK_VOUT2_TUNE,
 123                         .enable_reg = BD957X_REG_POW_TRIGGER2,
 124                         .enable_mask = BD957X_REGULATOR_EN_MASK,
 125                         .enable_val = BD957X_REGULATOR_DIS_VAL,
 126                         .enable_is_inverted = true,
 127                         .owner = THIS_MODULE,
 128                 },
 129         },
 130         {
 131                 .desc = {
 132                         .name = "VDDDR",
 133                         .of_match = of_match_ptr("regulator-vdddr"),
 134                         .regulators_node = of_match_ptr("regulators"),
 135                         .id = BD957X_VDDDR,
 136                         .ops = &bd957x_vout34_ops,
 137                         .type = REGULATOR_VOLTAGE,
 138                         .n_voltages = BD957X_VOUTS34_NUM_VOLT,
 139                         .vsel_reg = BD957X_REG_VOUT3_TUNE,
 140                         .vsel_mask = BD957X_MASK_VOUT3_TUNE,
 141                         .enable_reg = BD957X_REG_POW_TRIGGER3,
 142                         .enable_mask = BD957X_REGULATOR_EN_MASK,
 143                         .enable_val = BD957X_REGULATOR_DIS_VAL,
 144                         .enable_is_inverted = true,
 145                         .owner = THIS_MODULE,
 146                 },
 147         },
 148         {
 149                 .desc = {
 150                         .name = "VD10",
 151                         .of_match = of_match_ptr("regulator-vd10"),
 152                         .regulators_node = of_match_ptr("regulators"),
 153                         .id = BD957X_VD10,
 154                         .ops = &bd957x_vout34_ops,
 155                         .type = REGULATOR_VOLTAGE,
 156                         .fixed_uV = BD957X_VOUTS4_BASE_VOLT,
 157                         .n_voltages = BD957X_VOUTS34_NUM_VOLT,
 158                         .vsel_reg = BD957X_REG_VOUT4_TUNE,
 159                         .vsel_mask = BD957X_MASK_VOUT4_TUNE,
 160                         .enable_reg = BD957X_REG_POW_TRIGGER4,
 161                         .enable_mask = BD957X_REGULATOR_EN_MASK,
 162                         .enable_val = BD957X_REGULATOR_DIS_VAL,
 163                         .enable_is_inverted = true,
 164                         .owner = THIS_MODULE,
 165                 },
 166         },
 167         {
 168                 .desc = {
 169                         .name = "VOUTL1",
 170                         .of_match = of_match_ptr("regulator-voutl1"),
 171                         .regulators_node = of_match_ptr("regulators"),
 172                         .id = BD957X_VOUTL1,
 173                         .ops = &bd957x_ops,
 174                         .type = REGULATOR_VOLTAGE,
 175                         .volt_table = &voutl1_volt_table[0],
 176                         .n_voltages = ARRAY_SIZE(voutl1_volt_table),
 177                         .vsel_reg = BD957X_REG_VOUTL1_TUNE,
 178                         .vsel_mask = BD957X_MASK_VOUTL1_TUNE,
 179                         .enable_reg = BD957X_REG_POW_TRIGGERL1,
 180                         .enable_mask = BD957X_REGULATOR_EN_MASK,
 181                         .enable_val = BD957X_REGULATOR_DIS_VAL,
 182                         .enable_is_inverted = true,
 183                         .owner = THIS_MODULE,
 184                 },
 185         },
 186         {
 187                 .desc = {
 188                         .name = "VOUTS1",
 189                         .of_match = of_match_ptr("regulator-vouts1"),
 190                         .regulators_node = of_match_ptr("regulators"),
 191                         .id = BD957X_VOUTS1,
 192                         .ops = &bd957X_vouts1_regulator_ops,
 193                         .type = REGULATOR_VOLTAGE,
 194                         .n_voltages = 1,
 195                         .fixed_uV = BD957X_VOUTS1_VOLT,
 196                         .enable_reg = BD957X_REG_POW_TRIGGERS1,
 197                         .enable_mask = BD957X_REGULATOR_EN_MASK,
 198                         .enable_val = BD957X_REGULATOR_DIS_VAL,
 199                         .enable_is_inverted = true,
 200                         .owner = THIS_MODULE,
 201                 },
 202         },
 203 };
 204
 205 static int bd957x_probe(struct platform_device *pdev)
 206 {
 207         struct regmap *regmap;
 208         struct regulator_config config = { 0 };
 209         int i;
 210         bool vout_mode, ddr_sel;
 211         const struct bd957x_regulator_data *reg_data = &bd9576_regulators[0];
 212         unsigned int num_reg_data = ARRAY_SIZE(bd9576_regulators);
 213         enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
 214
 215         regmap = dev_get_regmap(pdev->dev.parent, NULL);
 216         if (!regmap) {
 217                 dev_err(&pdev->dev, "No regmap\n");
 218                 return -EINVAL;
 219         }
 220         vout_mode = of_property_read_bool(pdev->dev.parent->of_node,
 221                                          "rohm,vout1-en-low");
 222         if (vout_mode) {
 223                 struct gpio_desc *en;
 224
 225                 dev_dbg(&pdev->dev, "GPIO controlled mode\n");
 226
 227                 /* VOUT1 enable state judged by VOUT1_EN pin */
 228                 /* See if we have GPIO defined */
 229                 en = devm_gpiod_get_from_of_node(&pdev->dev,
 230                                                  pdev->dev.parent->of_node,
 231                                                  "rohm,vout1-en-gpios", 0,
 232                                                  GPIOD_OUT_LOW, "vout1-en");
 233                 if (!IS_ERR(en)) {
 234                         /* VOUT1_OPS gpio ctrl */
 235                         /*
 236                          * Regulator core prioritizes the ena_gpio over
 237                          * enable/disable/is_enabled callbacks so no need to
 238                          * clear them. We can still use same ops
 239                          */
 240                         config.ena_gpiod = en;
 241                 } else {
 242                         /*
 243                          * In theory it is possible someone wants to set
 244                          * vout1-en LOW during OTP loading and set VOUT1 to be
 245                          * controlled by GPIO - but control the GPIO from some
 246                          * where else than this driver. For that to work we
 247                          * should unset the is_enabled callback here.
 248                          *
 249                          * I believe such case where rohm,vout1-en-low is set
 250                          * and vout1-en-gpios is not is likely to be a
 251                          * misconfiguration. So let's just err out for now.
 252                          */
 253                         dev_err(&pdev->dev,
 254                                 "Failed to get VOUT1 control GPIO\n");
 255                         return PTR_ERR(en);
 256                 }
 257         }
 258
 259         /*
 260          * If more than one PMIC needs to be controlled by same processor then
 261          * allocate the regulator data array here and use bd9576_regulators as
 262          * template. At the moment I see no such use-case so I spare some
 263          * bytes and use bd9576_regulators directly for non-constant configs
 264          * like DDR voltage selection.
 265          */
 266         ddr_sel =  of_property_read_bool(pdev->dev.parent->of_node,
 267                                          "rohm,ddr-sel-low");
 268         if (ddr_sel)
 269                 bd9576_regulators[2].desc.fixed_uV = 1350000;
 270         else
 271                 bd9576_regulators[2].desc.fixed_uV = 1500000;
 272
 273         switch (chip) {
 274         case ROHM_CHIP_TYPE_BD9576:
 275                 dev_dbg(&pdev->dev, "Found BD9576MUF\n");
 276                 break;
 277         case ROHM_CHIP_TYPE_BD9573:
 278                 dev_dbg(&pdev->dev, "Found BD9573MUF\n");
 279                 break;
 280         default:
 281                 dev_err(&pdev->dev, "Unsupported chip type\n");
 282                 return -EINVAL;
 283         }
 284
 285         config.dev = pdev->dev.parent;
 286         config.regmap = regmap;
 287
 288         for (i = 0; i < num_reg_data; i++) {
 289
 290                 const struct regulator_desc *desc;
 291                 struct regulator_dev *rdev;
 292                 const struct bd957x_regulator_data *r;
 293
 294                 r = &reg_data[i];
 295                 desc = &r->desc;
 296
 297                 rdev = devm_regulator_register(&pdev->dev, desc, &config);
 298                 if (IS_ERR(rdev)) {
 299                         dev_err(&pdev->dev,
 300                                 "failed to register %s regulator\n",
 301                                 desc->name);
 302                         return PTR_ERR(rdev);
 303                 }
 304                 /*
 305                  * Clear the VOUT1 GPIO setting - rest of the regulators do not
 306                  * support GPIO control
 307                  */
 308                 config.ena_gpiod = NULL;
 309         }
 310
 311         return 0;
 312 }
 313
 314 static const struct platform_device_id bd957x_pmic_id[] = {
 315         { "bd9573-pmic", ROHM_CHIP_TYPE_BD9573 },
 316         { "bd9576-pmic", ROHM_CHIP_TYPE_BD9576 },
 317         { },
 318 };
 319 MODULE_DEVICE_TABLE(platform, bd957x_pmic_id);
 320
 321 static struct platform_driver bd957x_regulator = {
 322         .driver = {
 323                 .name = "bd957x-pmic",
 324         },
 325         .probe = bd957x_probe,
 326         .id_table = bd957x_pmic_id,
 327 };
 328
 329 module_platform_driver(bd957x_regulator);
 330
 331 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 332 MODULE_DESCRIPTION("ROHM BD9576/BD9573 voltage regulator driver");
 333 MODULE_LICENSE("GPL");
 334 MODULE_ALIAS("platform:bd957x-pmic");