target/linux/mxs/patches-4.4/102-mxs-add-regulator-driver.patch

   1 --- a/drivers/regulator/Kconfig
   2 +++ b/drivers/regulator/Kconfig
   3 @@ -450,6 +450,14 @@ config REGULATOR_MT6397
   4           This driver supports the control of different power rails of device
   5           through regulator interface.
   6
   7 +config REGULATOR_MXS
   8 +       tristate "Freescale MXS on-chip regulators"
   9 +       depends on (MXS_POWER || COMPILE_TEST)
  10 +       help
  11 +         Say y here to support Freescale MXS on-chip regulators.
  12 +         It is recommended that this option be enabled on i.MX23,
  13 +         i.MX28 platform.
  14 +
  15  config REGULATOR_PALMAS
  16         tristate "TI Palmas PMIC Regulators"
  17         depends on MFD_PALMAS
  18 --- a/drivers/regulator/Makefile
  19 +++ b/drivers/regulator/Makefile
  20 @@ -60,6 +60,7 @@ obj-$(CONFIG_REGULATOR_MC13783) += mc137
  21  obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
  22  obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
  23  obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o
  24 +obj-$(CONFIG_REGULATOR_MXS) += mxs-regulator.o
  25  obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
  26  obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
  27  obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
  28 --- /dev/null
  29 +++ b/drivers/regulator/mxs-regulator.c
  30 @@ -0,0 +1,540 @@
  31 +/*
  32 + * Freescale MXS on-chip regulators
  33 + *
  34 + * Embedded Alley Solutions, Inc <source@embeddedalley.com>
  35 + *
  36 + * Copyright (C) 2014 Stefan Wahren
  37 + * Copyright (C) 2010 Freescale Semiconductor, Inc.
  38 + * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
  39 + *
  40 + * Inspired by imx-bootlets
  41 + */
  42 +
  43 +/*
  44 + * The code contained herein is licensed under the GNU General Public
  45 + * License. You may obtain a copy of the GNU General Public License
  46 + * Version 2 or later at the following locations:
  47 + *
  48 + * http://www.opensource.org/licenses/gpl-license.html
  49 + * http://www.gnu.org/copyleft/gpl.html
  50 + */
  51 +
  52 +#include <linux/delay.h>
  53 +#include <linux/device.h>
  54 +#include <linux/err.h>
  55 +#include <linux/kernel.h>
  56 +#include <linux/mfd/syscon.h>
  57 +#include <linux/module.h>
  58 +#include <linux/of.h>
  59 +#include <linux/of_device.h>
  60 +#include <linux/platform_device.h>
  61 +#include <linux/regmap.h>
  62 +#include <linux/regulator/driver.h>
  63 +#include <linux/regulator/machine.h>
  64 +#include <linux/regulator/of_regulator.h>
  65 +#include <linux/slab.h>
  66 +
  67 +/* Powered by linear regulator.  DCDC output is gated off and
  68 +   the linreg output is equal to the target. */
  69 +#define HW_POWER_LINREG_DCDC_OFF               1
  70 +
  71 +/* Powered by linear regulator.  DCDC output is not gated off
  72 +   and is ready for the automatic hardware transistion after a 5V
  73 +   event.  The converters are not enabled when 5V is present. LinReg output
  74 +   is 25mV below target. */
  75 +#define HW_POWER_LINREG_DCDC_READY             2
  76 +
  77 +/* Powered by DCDC converter and the LinReg is on. LinReg output
  78 +   is 25mV below target. */
  79 +#define HW_POWER_DCDC_LINREG_ON                        3
  80 +
  81 +/* Powered by DCDC converter and the LinReg is off. LinReg output
  82 +   is 25mV below target. */
  83 +#define HW_POWER_DCDC_LINREG_OFF               4
  84 +
  85 +/* Powered by DCDC converter and the LinReg is ready for the
  86 +   automatic hardware transfer.  The LinReg output is not enabled and
  87 +   depends on the 5V presence to enable the LinRegs.  LinReg offset is 25mV
  88 +   below target. */
  89 +#define HW_POWER_DCDC_LINREG_READY             5
  90 +
  91 +/* Powered by an external source when 5V is present.  This does not
  92 +   necessarily mean the external source is powered by 5V,but the chip needs
  93 +   to be aware that 5V is present. */
  94 +#define HW_POWER_EXTERNAL_SOURCE_5V            6
  95 +
  96 +/* Powered by an external source when 5V is not present.This doesn't
  97 +   necessarily mean the external source is powered by the battery, but the
  98 +   chip needs to be aware that the battery is present */
  99 +#define HW_POWER_EXTERNAL_SOURCE_BATTERY       7
 100 +
 101 +/* Unknown configuration.  This is an error. */
 102 +#define HW_POWER_UNKNOWN_SOURCE                        8
 103 +
 104 +/* TODO: Move power register offsets into header file */
 105 +#define HW_POWER_5VCTRL                0x00000010
 106 +#define HW_POWER_VDDDCTRL      0x00000040
 107 +#define HW_POWER_VDDACTRL      0x00000050
 108 +#define HW_POWER_VDDIOCTRL     0x00000060
 109 +#define HW_POWER_MISC          0x00000090
 110 +#define HW_POWER_STS           0x000000c0
 111 +
 112 +#define BM_POWER_STS_VBUSVALID0_STATUS BIT(15)
 113 +#define BM_POWER_STS_DC_OK             BIT(9)
 114 +
 115 +#define BM_POWER_5VCTRL_ILIMIT_EQ_ZERO BIT(2)
 116 +#define BM_POWER_5VCTRL_ENABLE_DCDC    BIT(0)
 117 +
 118 +#define BM_POWER_LINREG_OFFSET_DCDC_MODE       BIT(1)
 119 +
 120 +#define SHIFT_FREQSEL                  4
 121 +
 122 +#define BM_POWER_MISC_FREQSEL          (7 << SHIFT_FREQSEL)
 123 +
 124 +/* Recommended DC-DC clock source values */
 125 +#define HW_POWER_MISC_FREQSEL_20000_KHZ        1
 126 +#define HW_POWER_MISC_FREQSEL_24000_KHZ        2
 127 +#define HW_POWER_MISC_FREQSEL_19200_KHZ        3
 128 +
 129 +#define HW_POWER_MISC_SEL_PLLCLK       BIT(0)
 130 +
 131 +/* Regulator IDs */
 132 +#define MXS_DCDC       1
 133 +#define MXS_VDDIO      2
 134 +#define MXS_VDDA       3
 135 +#define MXS_VDDD       4
 136 +
 137 +struct mxs_reg_info {
 138 +       /* regulator descriptor */
 139 +       struct regulator_desc desc;
 140 +
 141 +       /* regulator control register */
 142 +       int ctrl_reg;
 143 +
 144 +       /* disable DC-DC output */
 145 +       unsigned int disable_fet_mask;
 146 +
 147 +       /* steps between linreg output and DC-DC target */
 148 +       unsigned int linreg_offset_mask;
 149 +       u8 linreg_offset_shift;
 150 +
 151 +       /* function which determine power source */
 152 +       u8 (*get_power_source)(struct regulator_dev *);
 153 +};
 154 +
 155 +static inline u8 get_linreg_offset(struct mxs_reg_info *ldo, u32 regs)
 156 +{
 157 +       return (regs & ldo->linreg_offset_mask) >> ldo->linreg_offset_shift;
 158 +}
 159 +
 160 +static u8 get_vddio_power_source(struct regulator_dev *reg)
 161 +{
 162 +       struct mxs_reg_info *ldo = rdev_get_drvdata(reg);
 163 +       u32 v5ctrl, status, base;
 164 +       u8 offset;
 165 +
 166 +       if (regmap_read(reg->regmap, HW_POWER_5VCTRL, &v5ctrl))
 167 +               return HW_POWER_UNKNOWN_SOURCE;
 168 +
 169 +       if (regmap_read(reg->regmap, HW_POWER_STS, &status))
 170 +               return HW_POWER_UNKNOWN_SOURCE;
 171 +
 172 +       if (regmap_read(reg->regmap, ldo->ctrl_reg, &base))
 173 +               return HW_POWER_UNKNOWN_SOURCE;
 174 +
 175 +       offset = get_linreg_offset(ldo, base);
 176 +
 177 +       /* If VBUS valid then 5 V power supply present */
 178 +       if (status & BM_POWER_STS_VBUSVALID0_STATUS) {
 179 +               /* Powered by Linreg, DC-DC is off */
 180 +               if ((base & ldo->disable_fet_mask) &&
 181 +                   !(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)) {
 182 +                       return HW_POWER_LINREG_DCDC_OFF;
 183 +               }
 184 +
 185 +               if (v5ctrl & BM_POWER_5VCTRL_ENABLE_DCDC) {
 186 +                       /* Powered by DC-DC, Linreg is on */
 187 +                       if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)
 188 +                               return HW_POWER_DCDC_LINREG_ON;
 189 +               } else {
 190 +                       /* Powered by Linreg, DC-DC is off */
 191 +                       if (!(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE))
 192 +                               return HW_POWER_LINREG_DCDC_OFF;
 193 +               }
 194 +       } else {
 195 +               /* Powered by DC-DC, Linreg is on */
 196 +               if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)
 197 +                       return HW_POWER_DCDC_LINREG_ON;
 198 +       }
 199 +
 200 +       return HW_POWER_UNKNOWN_SOURCE;
 201 +}
 202 +
 203 +static u8 get_vdda_vddd_power_source(struct regulator_dev *reg)
 204 +{
 205 +       struct mxs_reg_info *ldo = rdev_get_drvdata(reg);
 206 +       struct regulator_desc *desc = &ldo->desc;
 207 +       u32 v5ctrl, status, base;
 208 +       u8 offset;
 209 +
 210 +       if (regmap_read(reg->regmap, HW_POWER_5VCTRL, &v5ctrl))
 211 +               return HW_POWER_UNKNOWN_SOURCE;
 212 +
 213 +       if (regmap_read(reg->regmap, HW_POWER_STS, &status))
 214 +               return HW_POWER_UNKNOWN_SOURCE;
 215 +
 216 +       if (regmap_read(reg->regmap, ldo->ctrl_reg, &base))
 217 +               return HW_POWER_UNKNOWN_SOURCE;
 218 +
 219 +       offset = get_linreg_offset(ldo, base);
 220 +
 221 +       /* DC-DC output is disabled */
 222 +       if (base & ldo->disable_fet_mask) {
 223 +               /* Powered by 5 V supply */
 224 +               if (status & BM_POWER_STS_VBUSVALID0_STATUS)
 225 +                       return HW_POWER_EXTERNAL_SOURCE_5V;
 226 +
 227 +               /* Powered by Linreg, DC-DC is off */
 228 +               if (!(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE))
 229 +                       return HW_POWER_LINREG_DCDC_OFF;
 230 +       }
 231 +
 232 +       /* If VBUS valid then 5 V power supply present */
 233 +       if (status & BM_POWER_STS_VBUSVALID0_STATUS) {
 234 +               /* Powered by DC-DC, Linreg is on */
 235 +               if (v5ctrl & BM_POWER_5VCTRL_ENABLE_DCDC)
 236 +                       return HW_POWER_DCDC_LINREG_ON;
 237 +
 238 +               /* Powered by Linreg, DC-DC is off */
 239 +               return HW_POWER_LINREG_DCDC_OFF;
 240 +       }
 241 +
 242 +       /* DC-DC is on */
 243 +       if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE) {
 244 +               /* Powered by DC-DC, Linreg is on */
 245 +               if (base & desc->enable_mask)
 246 +                       return HW_POWER_DCDC_LINREG_ON;
 247 +
 248 +               /* Powered by DC-DC, Linreg is off */
 249 +               return HW_POWER_DCDC_LINREG_OFF;
 250 +       }
 251 +
 252 +       return HW_POWER_UNKNOWN_SOURCE;
 253 +}
 254 +
 255 +static int mxs_set_dcdc_freq(struct regulator_dev *reg, u32 hz)
 256 +{
 257 +       struct mxs_reg_info *dcdc = rdev_get_drvdata(reg);
 258 +       u32 val;
 259 +       int ret;
 260 +
 261 +       if (dcdc->desc.id != MXS_DCDC) {
 262 +               dev_warn(&reg->dev, "Setting switching freq is not supported\n");
 263 +               return -EINVAL;
 264 +       }
 265 +
 266 +       ret = regmap_read(reg->regmap, HW_POWER_MISC, &val);
 267 +       if (ret)
 268 +               return ret;
 269 +
 270 +       val &= ~BM_POWER_MISC_FREQSEL;
 271 +       val &= ~HW_POWER_MISC_SEL_PLLCLK;
 272 +
 273 +       /*
 274 +        * Select the PLL/PFD based frequency that the DC-DC converter uses.
 275 +        * The actual switching frequency driving the power inductor is
 276 +        * DCDC_CLK/16. Accept only values recommend by Freescale.
 277 +        */
 278 +       switch (hz) {
 279 +       case 1200000:
 280 +               val |= HW_POWER_MISC_FREQSEL_19200_KHZ << SHIFT_FREQSEL;
 281 +               break;
 282 +       case 1250000:
 283 +               val |= HW_POWER_MISC_FREQSEL_20000_KHZ << SHIFT_FREQSEL;
 284 +               break;
 285 +       case 1500000:
 286 +               val |= HW_POWER_MISC_FREQSEL_24000_KHZ << SHIFT_FREQSEL;
 287 +               break;
 288 +       default:
 289 +               dev_warn(&reg->dev, "Switching freq: %u Hz not supported\n",
 290 +                        hz);
 291 +               return -EINVAL;
 292 +       }
 293 +
 294 +       /* First program FREQSEL */
 295 +       ret = regmap_write(reg->regmap, HW_POWER_MISC, val);
 296 +       if (ret)
 297 +               return ret;
 298 +
 299 +       /* then set PLL as clock for DC-DC converter */
 300 +       val |= HW_POWER_MISC_SEL_PLLCLK;
 301 +
 302 +       return regmap_write(reg->regmap, HW_POWER_MISC, val);
 303 +}
 304 +
 305 +static int mxs_ldo_set_voltage_sel(struct regulator_dev *reg, unsigned sel)
 306 +{
 307 +       struct mxs_reg_info *ldo = rdev_get_drvdata(reg);
 308 +       struct regulator_desc *desc = &ldo->desc;
 309 +       u32 status = 0;
 310 +       int timeout;
 311 +       int ret;
 312 +
 313 +       ret = regmap_update_bits(reg->regmap, desc->vsel_reg, desc->vsel_mask,
 314 +                                sel);
 315 +       if (ret)
 316 +               return ret;
 317 +
 318 +       if (ldo->get_power_source) {
 319 +               switch (ldo->get_power_source(reg)) {
 320 +               case HW_POWER_LINREG_DCDC_OFF:
 321 +               case HW_POWER_LINREG_DCDC_READY:
 322 +               case HW_POWER_EXTERNAL_SOURCE_5V:
 323 +                       /*
 324 +                        * Since the DC-DC converter is off we can't
 325 +                        * trigger on DC_OK. So wait at least 1 ms
 326 +                        * for stabilization.
 327 +                        */
 328 +                       usleep_range(1000, 2000);
 329 +                       return 0;
 330 +               }
 331 +       }
 332 +
 333 +       /* Make sure DC_OK has changed */
 334 +       usleep_range(15, 20);
 335 +
 336 +       for (timeout = 0; timeout < 20; timeout++) {
 337 +               ret = regmap_read(reg->regmap, HW_POWER_STS, &status);
 338 +
 339 +               if (ret)
 340 +                       break;
 341 +
 342 +               /* DC-DC converter control loop has stabilized */
 343 +               if (status & BM_POWER_STS_DC_OK)
 344 +                       return 0;
 345 +
 346 +               udelay(1);
 347 +       }
 348 +
 349 +       if (!ret)
 350 +               dev_warn_ratelimited(&reg->dev, "%s: timeout status=0x%08x\n",
 351 +                                    __func__, status);
 352 +
 353 +       msleep(20);
 354 +
 355 +       return -ETIMEDOUT;
 356 +}
 357 +
 358 +static int mxs_ldo_is_enabled(struct regulator_dev *reg)
 359 +{
 360 +       struct mxs_reg_info *ldo = rdev_get_drvdata(reg);
 361 +
 362 +       if (ldo->get_power_source) {
 363 +               switch (ldo->get_power_source(reg)) {
 364 +               case HW_POWER_LINREG_DCDC_OFF:
 365 +               case HW_POWER_LINREG_DCDC_READY:
 366 +               case HW_POWER_DCDC_LINREG_ON:
 367 +                       return 1;
 368 +               }
 369 +       }
 370 +
 371 +       return 0;
 372 +}
 373 +
 374 +static struct regulator_ops mxs_dcdc_ops = {
 375 +       .is_enabled             = regulator_is_enabled_regmap,
 376 +};
 377 +
 378 +static struct regulator_ops mxs_ldo_ops = {
 379 +       .list_voltage           = regulator_list_voltage_linear,
 380 +       .map_voltage            = regulator_map_voltage_linear,
 381 +       .set_voltage_sel        = mxs_ldo_set_voltage_sel,
 382 +       .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 383 +       .is_enabled             = mxs_ldo_is_enabled,
 384 +};
 385 +
 386 +static const struct mxs_reg_info mxs_info_dcdc = {
 387 +       .desc = {
 388 +               .name = "dcdc",
 389 +               .id = MXS_DCDC,
 390 +               .type = REGULATOR_VOLTAGE,
 391 +               .owner = THIS_MODULE,
 392 +               .ops = &mxs_dcdc_ops,
 393 +               .enable_reg = HW_POWER_STS,
 394 +               .enable_mask = (1 << 0),
 395 +       },
 396 +};
 397 +
 398 +static const struct mxs_reg_info imx23_info_vddio = {
 399 +       .desc = {
 400 +               .name = "vddio",
 401 +               .id = MXS_VDDIO,
 402 +               .type = REGULATOR_VOLTAGE,
 403 +               .owner = THIS_MODULE,
 404 +               .n_voltages = 0x20,
 405 +               .uV_step = 25000,
 406 +               .linear_min_sel = 0,
 407 +               .min_uV = 2800000,
 408 +               .vsel_reg = HW_POWER_VDDIOCTRL,
 409 +               .vsel_mask = 0x1f,
 410 +               .ops = &mxs_ldo_ops,
 411 +       },
 412 +       .ctrl_reg = HW_POWER_VDDIOCTRL,
 413 +       .disable_fet_mask = 1 << 16,
 414 +       .linreg_offset_mask = 3 << 12,
 415 +       .linreg_offset_shift = 12,
 416 +       .get_power_source = get_vddio_power_source,
 417 +};
 418 +
 419 +static const struct mxs_reg_info imx28_info_vddio = {
 420 +       .desc = {
 421 +               .name = "vddio",
 422 +               .id = MXS_VDDIO,
 423 +               .type = REGULATOR_VOLTAGE,
 424 +               .owner = THIS_MODULE,
 425 +               .n_voltages = 0x11,
 426 +               .uV_step = 50000,
 427 +               .linear_min_sel = 0,
 428 +               .min_uV = 2800000,
 429 +               .vsel_reg = HW_POWER_VDDIOCTRL,
 430 +               .vsel_mask = 0x1f,
 431 +               .ops = &mxs_ldo_ops,
 432 +       },
 433 +       .ctrl_reg = HW_POWER_VDDIOCTRL,
 434 +       .disable_fet_mask = 1 << 16,
 435 +       .linreg_offset_mask = 3 << 12,
 436 +       .linreg_offset_shift = 12,
 437 +       .get_power_source = get_vddio_power_source,
 438 +};
 439 +
 440 +static const struct mxs_reg_info mxs_info_vdda = {
 441 +       .desc = {
 442 +               .name = "vdda",
 443 +               .id = MXS_VDDA,
 444 +               .type = REGULATOR_VOLTAGE,
 445 +               .owner = THIS_MODULE,
 446 +               .n_voltages = 0x20,
 447 +               .uV_step = 25000,
 448 +               .linear_min_sel = 0,
 449 +               .min_uV = 1500000,
 450 +               .vsel_reg = HW_POWER_VDDACTRL,
 451 +               .vsel_mask = 0x1f,
 452 +               .ops = &mxs_ldo_ops,
 453 +               .enable_mask = (1 << 17),
 454 +       },
 455 +       .ctrl_reg = HW_POWER_VDDACTRL,
 456 +       .disable_fet_mask = 1 << 16,
 457 +       .linreg_offset_mask = 3 << 12,
 458 +       .linreg_offset_shift = 12,
 459 +       .get_power_source = get_vdda_vddd_power_source,
 460 +};
 461 +
 462 +static const struct mxs_reg_info mxs_info_vddd = {
 463 +       .desc = {
 464 +               .name = "vddd",
 465 +               .id = MXS_VDDD,
 466 +               .type = REGULATOR_VOLTAGE,
 467 +               .owner = THIS_MODULE,
 468 +               .n_voltages = 0x20,
 469 +               .uV_step = 25000,
 470 +               .linear_min_sel = 0,
 471 +               .min_uV = 800000,
 472 +               .vsel_reg = HW_POWER_VDDDCTRL,
 473 +               .vsel_mask = 0x1f,
 474 +               .ops = &mxs_ldo_ops,
 475 +               .enable_mask = (1 << 21),
 476 +       },
 477 +       .ctrl_reg = HW_POWER_VDDDCTRL,
 478 +       .disable_fet_mask = 1 << 20,
 479 +       .linreg_offset_mask = 3 << 16,
 480 +       .linreg_offset_shift = 16,
 481 +       .get_power_source = get_vdda_vddd_power_source,
 482 +};
 483 +
 484 +static const struct of_device_id of_mxs_regulator_match[] = {
 485 +       { .compatible = "fsl,imx23-dcdc",  .data = &mxs_info_dcdc },
 486 +       { .compatible = "fsl,imx28-dcdc",  .data = &mxs_info_dcdc },
 487 +       { .compatible = "fsl,imx23-vddio", .data = &imx23_info_vddio },
 488 +       { .compatible = "fsl,imx23-vdda",  .data = &mxs_info_vdda },
 489 +       { .compatible = "fsl,imx23-vddd",  .data = &mxs_info_vddd },
 490 +       { .compatible = "fsl,imx28-vddio", .data = &imx28_info_vddio },
 491 +       { .compatible = "fsl,imx28-vdda",  .data = &mxs_info_vdda },
 492 +       { .compatible = "fsl,imx28-vddd",  .data = &mxs_info_vddd },
 493 +       { /* end */ }
 494 +};
 495 +MODULE_DEVICE_TABLE(of, of_mxs_regulator_match);
 496 +
 497 +static int mxs_regulator_probe(struct platform_device *pdev)
 498 +{
 499 +       struct device *dev = &pdev->dev;
 500 +       const struct of_device_id *match;
 501 +       struct device_node *parent_np;
 502 +       struct regulator_dev *rdev = NULL;
 503 +       struct mxs_reg_info *info;
 504 +       struct regulator_init_data *initdata;
 505 +       struct regulator_config config = { };
 506 +       u32 switch_freq;
 507 +
 508 +       match = of_match_device(of_mxs_regulator_match, dev);
 509 +       if (!match) {
 510 +               /* We do not expect this to happen */
 511 +               dev_err(dev, "%s: Unable to match device\n", __func__);
 512 +               return -ENODEV;
 513 +       }
 514 +
 515 +       info = devm_kmemdup(dev, match->data, sizeof(struct mxs_reg_info),
 516 +                           GFP_KERNEL);
 517 +       if (!info)
 518 +               return -ENOMEM;
 519 +
 520 +       initdata = of_get_regulator_init_data(dev, dev->of_node, &info->desc);
 521 +       if (!initdata) {
 522 +               dev_err(dev, "missing regulator init data\n");
 523 +               return -EINVAL;
 524 +       }
 525 +
 526 +       parent_np = of_get_parent(dev->of_node);
 527 +       if (!parent_np)
 528 +               return -ENODEV;
 529 +       config.regmap = syscon_node_to_regmap(parent_np);
 530 +       of_node_put(parent_np);
 531 +       if (IS_ERR(config.regmap))
 532 +               return PTR_ERR(config.regmap);
 533 +
 534 +       config.dev = dev;
 535 +       config.init_data = initdata;
 536 +       config.driver_data = info;
 537 +       config.of_node = dev->of_node;
 538 +
 539 +       rdev = devm_regulator_register(dev, &info->desc, &config);
 540 +       if (IS_ERR(rdev)) {
 541 +               int ret = PTR_ERR(rdev);
 542 +
 543 +               dev_err(dev, "%s: failed to register regulator(%d)\n",
 544 +                       __func__, ret);
 545 +               return ret;
 546 +       }
 547 +
 548 +       if (!of_property_read_u32(dev->of_node, "switching-frequency",
 549 +                                 &switch_freq))
 550 +               mxs_set_dcdc_freq(rdev, switch_freq);
 551 +
 552 +       platform_set_drvdata(pdev, rdev);
 553 +
 554 +       return 0;
 555 +}
 556 +
 557 +static struct platform_driver mxs_regulator_driver = {
 558 +       .driver = {
 559 +               .name   = "mxs_regulator",
 560 +               .of_match_table = of_mxs_regulator_match,
 561 +       },
 562 +       .probe  = mxs_regulator_probe,
 563 +};
 564 +
 565 +module_platform_driver(mxs_regulator_driver);
 566 +
 567 +MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
 568 +MODULE_DESCRIPTION("Freescale MXS regulators");
 569 +MODULE_LICENSE("GPL v2");
 570 +MODULE_ALIAS("platform:mxs_regulator");