regulator: sc2731: Add regulator driver to support Spreadtrum SC2731 PMIC

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.chen@spreadtrum.com>
Reviewed-by: Baolin Wang <baolin.wang@spreadtrum.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 264 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 96cd55f9e3c5..b27417ca188a 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 80ffc57a9ca3..19fea09ba10a 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 000000000000..794fcd504b3d
--- /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.chen@spreadtrum.com>");
+MODULE_DESCRIPTION("Spreadtrum SC2731 regulator driver");
+MODULE_LICENSE("GPL v2");