Add regulator driver for Spreadtrum SC2731 device.
It has 17 general purpose LDOs, BUCKs generator and
digital output to control regulators.

Signed-off-by: Erick Chen <erick.c...@spreadtrum.com>
Reviewed-by: Baolin Wang <baolin.w...@spreadtrum.com>
---
Changes since v1:
- Remove of_device_id table.
- Change subsys_init() to module_init().
- Change the file's license format.
---
 drivers/regulator/Kconfig            |    7 +
 drivers/regulator/Makefile           |    1 +
 drivers/regulator/sc2731-regulator.c |  256 ++++++++++++++++++++++++++++++++++
 3 files changed, 264 insertions(+)
 create mode 100644 drivers/regulator/sc2731-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 96cd55f..b27417c 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -744,6 +744,13 @@ config REGULATOR_S5M8767
         via I2C bus. S5M8767A have 9 Bucks and 28 LDOs output and
         supports DVS mode with 8bits of output voltage control.
 
+config REGULATOR_SC2731
+       tristate "Spreadtrum SC2731 power regulator driver"
+       depends on MFD_SC27XX_PMIC || COMPILE_TEST
+       help
+         This driver provides support for the voltage regulators on the
+         SC2731 PMIC.
+
 config REGULATOR_SKY81452
        tristate "Skyworks Solutions SKY81452 voltage regulator"
        depends on MFD_SKY81452
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 80ffc57..19fea09 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -95,6 +95,7 @@ obj-$(CONFIG_REGULATOR_RT5033)        += rt5033-regulator.o
 obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
+obj-$(CONFIG_REGULATOR_SC2731) += sc2731-regulator.o
 obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o
 obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o
 obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
diff --git a/drivers/regulator/sc2731-regulator.c 
b/drivers/regulator/sc2731-regulator.c
new file mode 100644
index 0000000..794fcd5
--- /dev/null
+++ b/drivers/regulator/sc2731-regulator.c
@@ -0,0 +1,256 @@
+ //SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017 Spreadtrum Communications Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+/*
+ * SC2731 regulator lock register
+ */
+#define SC2731_PWR_WR_PROT_VALUE       0xf0c
+#define SC2731_WR_UNLOCK               0x6e7f
+
+/*
+ * SC2731 enable register
+ */
+#define SC2731_POWER_PD_SW             0xc28
+#define SC2731_LDO_CAMA0_PD            0xcfc
+#define SC2731_LDO_CAMA1_PD            0xd04
+#define SC2731_LDO_CAMMOT_PD           0xd0c
+#define SC2731_LDO_VLDO_PD             0xd6c
+#define SC2731_LDO_EMMCCORE_PD         0xd2c
+#define SC2731_LDO_SDCORE_PD           0xd74
+#define SC2731_LDO_SDIO_PD             0xd70
+#define SC2731_LDO_WIFIPA_PD           0xd4c
+#define SC2731_LDO_USB33_PD            0xd5c
+#define SC2731_LDO_CAMD0_PD            0xd7c
+#define SC2731_LDO_CAMD1_PD            0xd84
+#define SC2731_LDO_CON_PD              0xd8c
+#define SC2731_LDO_CAMIO_PD            0xd94
+#define SC2731_LDO_SRAM_PD             0xd78
+
+/*
+ * SC2731 enable mask
+ */
+#define SC2731_DCDC_CPU0_PD_MASK       BIT(4)
+#define SC2731_DCDC_CPU1_PD_MASK       BIT(3)
+#define SC2731_DCDC_RF_PD_MASK         BIT(11)
+#define SC2731_LDO_CAMA0_PD_MASK       BIT(0)
+#define SC2731_LDO_CAMA1_PD_MASK       BIT(0)
+#define SC2731_LDO_CAMMOT_PD_MASK      BIT(0)
+#define SC2731_LDO_VLDO_PD_MASK                BIT(0)
+#define SC2731_LDO_EMMCCORE_PD_MASK    BIT(0)
+#define SC2731_LDO_SDCORE_PD_MASK      BIT(0)
+#define SC2731_LDO_SDIO_PD_MASK                BIT(0)
+#define SC2731_LDO_WIFIPA_PD_MASK      BIT(0)
+#define SC2731_LDO_USB33_PD_MASK       BIT(0)
+#define SC2731_LDO_CAMD0_PD_MASK       BIT(0)
+#define SC2731_LDO_CAMD1_PD_MASK       BIT(0)
+#define SC2731_LDO_CON_PD_MASK         BIT(0)
+#define SC2731_LDO_CAMIO_PD_MASK       BIT(0)
+#define SC2731_LDO_SRAM_PD_MASK                BIT(0)
+
+/*
+ * SC2731 vsel register
+ */
+#define SC2731_DCDC_CPU0_VOL           0xc54
+#define SC2731_DCDC_CPU1_VOL           0xc64
+#define SC2731_DCDC_RF_VOL             0xcb8
+#define SC2731_LDO_CAMA0_VOL           0xd00
+#define SC2731_LDO_CAMA1_VOL           0xd08
+#define SC2731_LDO_CAMMOT_VOL          0xd10
+#define SC2731_LDO_VLDO_VOL            0xd28
+#define SC2731_LDO_EMMCCORE_VOL                0xd30
+#define SC2731_LDO_SDCORE_VOL          0xd38
+#define SC2731_LDO_SDIO_VOL            0xd40
+#define SC2731_LDO_WIFIPA_VOL          0xd50
+#define SC2731_LDO_USB33_VOL           0xd60
+#define SC2731_LDO_CAMD0_VOL           0xd80
+#define SC2731_LDO_CAMD1_VOL           0xd88
+#define SC2731_LDO_CON_VOL             0xd90
+#define SC2731_LDO_CAMIO_VOL           0xd98
+#define SC2731_LDO_SRAM_VOL            0xdB0
+
+/*
+ * SC2731 vsel register mask
+ */
+#define SC2731_DCDC_CPU0_VOL_MASK      GENMASK(8, 0)
+#define SC2731_DCDC_CPU1_VOL_MASK      GENMASK(8, 0)
+#define SC2731_DCDC_RF_VOL_MASK                GENMASK(8, 0)
+#define SC2731_LDO_CAMA0_VOL_MASK      GENMASK(7, 0)
+#define SC2731_LDO_CAMA1_VOL_MASK      GENMASK(7, 0)
+#define SC2731_LDO_CAMMOT_VOL_MASK     GENMASK(7, 0)
+#define SC2731_LDO_VLDO_VOL_MASK       GENMASK(7, 0)
+#define SC2731_LDO_EMMCCORE_VOL_MASK   GENMASK(7, 0)
+#define SC2731_LDO_SDCORE_VOL_MASK     GENMASK(7, 0)
+#define SC2731_LDO_SDIO_VOL_MASK       GENMASK(7, 0)
+#define SC2731_LDO_WIFIPA_VOL_MASK     GENMASK(7, 0)
+#define SC2731_LDO_USB33_VOL_MASK      GENMASK(7, 0)
+#define SC2731_LDO_CAMD0_VOL_MASK      GENMASK(6, 0)
+#define SC2731_LDO_CAMD1_VOL_MASK      GENMASK(6, 0)
+#define SC2731_LDO_CON_VOL_MASK                GENMASK(6, 0)
+#define SC2731_LDO_CAMIO_VOL_MASK      GENMASK(6, 0)
+#define SC2731_LDO_SRAM_VOL_MASK       GENMASK(6, 0)
+
+enum sc2731_regulator_id {
+       SC2731_BUCK_CPU0,
+       SC2731_BUCK_CPU1,
+       SC2731_BUCK_RF,
+       SC2731_LDO_CAMA0,
+       SC2731_LDO_CAMA1,
+       SC2731_LDO_CAMMOT,
+       SC2731_LDO_VLDO,
+       SC2731_LDO_EMMCCORE,
+       SC2731_LDO_SDCORE,
+       SC2731_LDO_SDIO,
+       SC2731_LDO_WIFIPA,
+       SC2731_LDO_USB33,
+       SC2731_LDO_CAMD0,
+       SC2731_LDO_CAMD1,
+       SC2731_LDO_CON,
+       SC2731_LDO_CAMIO,
+       SC2731_LDO_SRAM,
+};
+
+static const struct regulator_ops sc2731_regu_linear_ops = {
+       .enable = regulator_enable_regmap,
+       .disable = regulator_disable_regmap,
+       .is_enabled = regulator_is_enabled_regmap,
+       .list_voltage = regulator_list_voltage_linear,
+       .get_voltage_sel = regulator_get_voltage_sel_regmap,
+       .set_voltage_sel = regulator_set_voltage_sel_regmap,
+};
+
+#define SC2731_REGU_LINEAR(_id, en_reg, en_mask, vreg, vmask,  \
+                         vstep, vmin, vmax) {                  \
+       .name                   = #_id,                         \
+       .of_match               = of_match_ptr(#_id),           \
+       .ops                    = &sc2731_regu_linear_ops,      \
+       .type                   = REGULATOR_VOLTAGE,            \
+       .id                     = SC2731_##_id,                 \
+       .owner                  = THIS_MODULE,                  \
+       .min_uV                 = vmin,                         \
+       .n_voltages             = ((vmax) - (vmin)) / (vstep) + 1,      \
+       .uV_step                = vstep,                        \
+       .enable_is_inverted     = true,                         \
+       .enable_val             = 0,                            \
+       .enable_reg             = en_reg,                       \
+       .enable_mask            = en_mask,                      \
+       .vsel_reg               = vreg,                         \
+       .vsel_mask              = vmask,                        \
+}
+
+static struct regulator_desc regulators[] = {
+       SC2731_REGU_LINEAR(BUCK_CPU0, SC2731_POWER_PD_SW,
+                          SC2731_DCDC_CPU0_PD_MASK, SC2731_DCDC_CPU0_VOL,
+                          SC2731_DCDC_CPU0_VOL_MASK, 3125, 400000, 1996875),
+       SC2731_REGU_LINEAR(BUCK_CPU1, SC2731_POWER_PD_SW,
+                          SC2731_DCDC_CPU1_PD_MASK, SC2731_DCDC_CPU1_VOL,
+                          SC2731_DCDC_CPU1_VOL_MASK, 3125, 400000, 1996875),
+       SC2731_REGU_LINEAR(BUCK_RF, SC2731_POWER_PD_SW, SC2731_DCDC_RF_PD_MASK,
+                          SC2731_DCDC_RF_VOL, SC2731_DCDC_RF_VOL_MASK,
+                          3125, 600000, 2196875),
+       SC2731_REGU_LINEAR(LDO_CAMA0, SC2731_LDO_CAMA0_PD,
+                          SC2731_LDO_CAMA0_PD_MASK, SC2731_LDO_CAMA0_VOL,
+                          SC2731_LDO_CAMA0_VOL_MASK, 10000, 1200000, 3750000),
+       SC2731_REGU_LINEAR(LDO_CAMA1, SC2731_LDO_CAMA1_PD,
+                          SC2731_LDO_CAMA1_PD_MASK, SC2731_LDO_CAMA1_VOL,
+                          SC2731_LDO_CAMA1_VOL_MASK, 10000, 1200000, 3750000),
+       SC2731_REGU_LINEAR(LDO_CAMMOT, SC2731_LDO_CAMMOT_PD,
+                          SC2731_LDO_CAMMOT_PD_MASK, SC2731_LDO_CAMMOT_VOL,
+                          SC2731_LDO_CAMMOT_VOL_MASK, 10000, 1200000, 3750000),
+       SC2731_REGU_LINEAR(LDO_VLDO, SC2731_LDO_VLDO_PD,
+                          SC2731_LDO_VLDO_PD_MASK, SC2731_LDO_VLDO_VOL,
+                          SC2731_LDO_VLDO_VOL_MASK, 10000, 1200000, 3750000),
+       SC2731_REGU_LINEAR(LDO_EMMCCORE, SC2731_LDO_EMMCCORE_PD,
+                          SC2731_LDO_EMMCCORE_PD_MASK, SC2731_LDO_EMMCCORE_VOL,
+                          SC2731_LDO_EMMCCORE_VOL_MASK, 10000, 1200000,
+                          3750000),
+       SC2731_REGU_LINEAR(LDO_SDCORE, SC2731_LDO_SDCORE_PD,
+                          SC2731_LDO_SDCORE_PD_MASK, SC2731_LDO_SDCORE_VOL,
+                          SC2731_LDO_SDCORE_VOL_MASK, 10000, 1200000, 3750000),
+       SC2731_REGU_LINEAR(LDO_SDIO, SC2731_LDO_SDIO_PD,
+                          SC2731_LDO_SDIO_PD_MASK, SC2731_LDO_SDIO_VOL,
+                          SC2731_LDO_SDIO_VOL_MASK, 10000, 1200000, 3750000),
+       SC2731_REGU_LINEAR(LDO_WIFIPA, SC2731_LDO_WIFIPA_PD,
+                          SC2731_LDO_WIFIPA_PD_MASK, SC2731_LDO_WIFIPA_VOL,
+                          SC2731_LDO_WIFIPA_VOL_MASK, 10000, 1200000, 3750000),
+       SC2731_REGU_LINEAR(LDO_USB33, SC2731_LDO_USB33_PD,
+                          SC2731_LDO_USB33_PD_MASK, SC2731_LDO_USB33_VOL,
+                          SC2731_LDO_USB33_VOL_MASK, 10000, 1200000, 3750000),
+       SC2731_REGU_LINEAR(LDO_CAMD0, SC2731_LDO_CAMD0_PD,
+                          SC2731_LDO_CAMD0_PD_MASK, SC2731_LDO_CAMD0_VOL,
+                          SC2731_LDO_CAMD0_VOL_MASK, 6250, 1000000, 1793750),
+       SC2731_REGU_LINEAR(LDO_CAMD1, SC2731_LDO_CAMD1_PD,
+                          SC2731_LDO_CAMD1_PD_MASK, SC2731_LDO_CAMD1_VOL,
+                          SC2731_LDO_CAMD1_VOL_MASK, 6250, 1000000, 1793750),
+       SC2731_REGU_LINEAR(LDO_CON, SC2731_LDO_CON_PD,
+                          SC2731_LDO_CON_PD_MASK, SC2731_LDO_CON_VOL,
+                          SC2731_LDO_CON_VOL_MASK, 6250, 1000000, 1793750),
+       SC2731_REGU_LINEAR(LDO_CAMIO, SC2731_LDO_CAMIO_PD,
+                          SC2731_LDO_CAMIO_PD_MASK, SC2731_LDO_CAMIO_VOL,
+                          SC2731_LDO_CAMIO_VOL_MASK, 6250, 1000000, 1793750),
+       SC2731_REGU_LINEAR(LDO_SRAM, SC2731_LDO_SRAM_PD,
+                          SC2731_LDO_SRAM_PD_MASK, SC2731_LDO_SRAM_VOL,
+                          SC2731_LDO_SRAM_VOL_MASK, 6250, 1000000, 1793750),
+};
+
+static int sc2731_regulator_unlock(struct regmap *regmap)
+{
+       return regmap_write(regmap, SC2731_PWR_WR_PROT_VALUE,
+                           SC2731_WR_UNLOCK);
+}
+
+static int sc2731_regulator_probe(struct platform_device *pdev)
+{
+       int i, ret;
+       struct regmap *regmap;
+       struct regulator_config config = { };
+       struct regulator_dev *rdev;
+
+       regmap = dev_get_regmap(pdev->dev.parent, NULL);
+       if (!regmap) {
+               dev_err(&pdev->dev, "failed to get regmap.\n");
+               return -ENODEV;
+       }
+
+       ret = sc2731_regulator_unlock(regmap);
+       if (ret) {
+               dev_err(&pdev->dev, "failed to release regulator lock\n");
+               return ret;
+       }
+
+       config.dev = &pdev->dev;
+       config.regmap = regmap;
+
+       for (i = 0; i < ARRAY_SIZE(regulators); i++) {
+               rdev = devm_regulator_register(&pdev->dev, &regulators[i],
+                                              &config);
+               if (IS_ERR(rdev)) {
+                       dev_err(&pdev->dev, "failed to register regulator %s\n",
+                               regulators[i].name);
+                       return PTR_ERR(rdev);
+               }
+       }
+
+       return 0;
+}
+
+static struct platform_driver sc2731_regulator_driver = {
+       .driver = {
+               .name = "sc27xx-regulator",
+       },
+       .probe = sc2731_regulator_probe,
+};
+
+module_platform_driver(sc2731_regulator_driver);
+
+MODULE_AUTHOR("Chen Junhui <erick.c...@spreadtrum.com>");
+MODULE_DESCRIPTION("Spreadtrum SC2731 regulator driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

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