regulator: RK808: Add regulator driver for RK808

The regulator module consists of 4 DCDCs, 8 LDOs and 2 switches.
The output voltages are configurable and are meant to supply power
to the main processor and other components

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

3 files changed, 421 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 2dc8289e5dba..fb32babf756e 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -459,6 +459,16 @@ config REGULATOR_RC5T583
           through regulator interface. The device supports multiple DCDC/LDO
           outputs which can be controlled by i2c communication.
 
+config REGULATOR_RK808
+        tristate "Rockchip RK808 Power regulators"
+        depends on MFD_RK808
+        help
+          Select this option to enable the power regulator of ROCKCHIP
+          PMIC RK808.
+          This driver supports the control of different power rails of device
+          through regulator interface. The device supports multiple DCDC/LDO
+          outputs which can be controlled by i2c communication.
+
 config REGULATOR_S2MPA01
         tristate "Samsung S2MPA01 voltage regulator"
         depends on MFD_SEC_CORE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index aa4a6aa7b558..236fdbb2b786 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_REGULATOR_PBIAS) += pbias-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_RC5T583)  += rc5t583-regulator.o
+obj-$(CONFIG_REGULATOR_RK808)   += rk808-regulator.o
 obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
diff --git a/drivers/regulator/rk808-regulator.c b/drivers/regulator/rk808-regulator.c
new file mode 100644
index 000000000000..94753fd311c1
--- /dev/null
+++ b/drivers/regulator/rk808-regulator.c
@@ -0,0 +1,410 @@
+/*
+ * Regulator driver for Rockchip RK808
+ *
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author: Chris Zhong <zyw@rock-chips.com>
+ * Author: Zhang Qing <zhangqing@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/rk808.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+/*
+ * Field Definitions.
+ */
+#define RK808_BUCK_VSEL_MASK    0x3f
+#define RK808_BUCK4_VSEL_MASK   0xf
+#define RK808_LDO_VSEL_MASK     0x1f
+
+static const int buck_set_vol_base_addr[] = {
+        RK808_BUCK1_ON_VSEL_REG,
+        RK808_BUCK2_ON_VSEL_REG,
+        RK808_BUCK3_CONFIG_REG,
+        RK808_BUCK4_ON_VSEL_REG,
+};
+
+static const int buck_contr_base_addr[] = {
+        RK808_BUCK1_CONFIG_REG,
+        RK808_BUCK2_CONFIG_REG,
+        RK808_BUCK3_CONFIG_REG,
+        RK808_BUCK4_CONFIG_REG,
+};
+
+#define rk808_BUCK_SET_VOL_REG(x) (buck_set_vol_base_addr[x])
+#define rk808_BUCK_CONTR_REG(x) (buck_contr_base_addr[x])
+#define rk808_LDO_SET_VOL_REG(x) (ldo_set_vol_base_addr[x])
+
+static const int ldo_set_vol_base_addr[] = {
+        RK808_LDO1_ON_VSEL_REG,
+        RK808_LDO2_ON_VSEL_REG,
+        RK808_LDO3_ON_VSEL_REG,
+        RK808_LDO4_ON_VSEL_REG,
+        RK808_LDO5_ON_VSEL_REG,
+        RK808_LDO6_ON_VSEL_REG,
+        RK808_LDO7_ON_VSEL_REG,
+        RK808_LDO8_ON_VSEL_REG,
+};
+
+/*
+ * rk808 voltage number
+ */
+static const struct regulator_linear_range rk808_buck_voltage_ranges[] = {
+        REGULATOR_LINEAR_RANGE(700000, 0, 63, 12500),
+};
+
+static const struct regulator_linear_range rk808_buck4_voltage_ranges[] = {
+        REGULATOR_LINEAR_RANGE(1800000, 0, 15, 100000),
+};
+
+static const struct regulator_linear_range rk808_ldo_voltage_ranges[] = {
+        REGULATOR_LINEAR_RANGE(1800000, 0, 16, 100000),
+};
+
+static const struct regulator_linear_range rk808_ldo3_voltage_ranges[] = {
+        REGULATOR_LINEAR_RANGE(800000, 0, 13, 100000),
+        REGULATOR_LINEAR_RANGE(2500000, 15, 15, 0),
+};
+
+static const struct regulator_linear_range rk808_ldo6_voltage_ranges[] = {
+        REGULATOR_LINEAR_RANGE(800000, 0, 17, 100000),
+};
+
+static struct regulator_ops rk808_reg_ops = {
+        .list_voltage           = regulator_list_voltage_linear_range,
+        .map_voltage            = regulator_map_voltage_linear_range,
+        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
+        .enable                 = regulator_enable_regmap,
+        .disable                = regulator_disable_regmap,
+        .is_enabled             = regulator_is_enabled_regmap,
+};
+
+static struct regulator_ops rk808_switch_ops = {
+        .enable = regulator_enable_regmap,
+        .disable = regulator_disable_regmap,
+        .is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct regulator_desc rk808_reg[] = {
+        {
+                .name = "DCDC_REG1",
+                .id = RK808_ID_DCDC1,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 64,
+                .linear_ranges = rk808_buck_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges),
+                .vsel_reg = RK808_BUCK1_ON_VSEL_REG,
+                .vsel_mask = RK808_BUCK_VSEL_MASK,
+                .enable_reg = RK808_DCDC_EN_REG,
+                .enable_mask = BIT(0),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "DCDC_REG2",
+                .id = RK808_ID_DCDC2,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 64,
+                .linear_ranges = rk808_buck_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges),
+                .vsel_reg = RK808_BUCK2_ON_VSEL_REG,
+                .vsel_mask = RK808_BUCK_VSEL_MASK,
+                .enable_reg = RK808_DCDC_EN_REG,
+                .enable_mask = BIT(1),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "DCDC_REG3",
+                .id = RK808_ID_DCDC3,
+                .ops = &rk808_switch_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 1,
+                .enable_reg = RK808_DCDC_EN_REG,
+                .enable_mask = BIT(2),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "DCDC_REG4",
+                .id = RK808_ID_DCDC4,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 17,
+                .linear_ranges = rk808_buck4_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_buck4_voltage_ranges),
+                .vsel_reg = RK808_BUCK4_ON_VSEL_REG,
+                .vsel_mask = RK808_BUCK4_VSEL_MASK,
+                .enable_reg = RK808_DCDC_EN_REG,
+                .enable_mask = BIT(3),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "LDO_REG1",
+                .id = RK808_ID_LDO1,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 17,
+                .linear_ranges = rk808_ldo_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
+                .vsel_reg = RK808_LDO1_ON_VSEL_REG,
+                .vsel_mask = RK808_LDO_VSEL_MASK,
+                .enable_reg = RK808_LDO_EN_REG,
+                .enable_mask = BIT(0),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "LDO_REG2",
+                .id = RK808_ID_LDO2,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 17,
+                .linear_ranges = rk808_ldo_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
+                .vsel_reg = RK808_LDO2_ON_VSEL_REG,
+                .vsel_mask = RK808_LDO_VSEL_MASK,
+                .enable_reg = RK808_LDO_EN_REG,
+                .enable_mask = BIT(1),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "LDO_REG3",
+                .id = RK808_ID_LDO3,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 16,
+                .linear_ranges = rk808_ldo3_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges),
+                .vsel_reg = RK808_LDO3_ON_VSEL_REG,
+                .vsel_mask = RK808_BUCK4_VSEL_MASK,
+                .enable_reg = RK808_LDO_EN_REG,
+                .enable_mask = BIT(2),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "LDO_REG4",
+                .id = RK808_ID_LDO4,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 17,
+                .linear_ranges = rk808_ldo_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
+                .vsel_reg = RK808_LDO4_ON_VSEL_REG,
+                .vsel_mask = RK808_LDO_VSEL_MASK,
+                .enable_reg = RK808_LDO_EN_REG,
+                .enable_mask = BIT(3),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "LDO_REG5",
+                .id = RK808_ID_LDO5,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 17,
+                .linear_ranges = rk808_ldo_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
+                .vsel_reg = RK808_LDO5_ON_VSEL_REG,
+                .vsel_mask = RK808_LDO_VSEL_MASK,
+                .enable_reg = RK808_LDO_EN_REG,
+                .enable_mask = BIT(4),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "LDO_REG6",
+                .id = RK808_ID_LDO6,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 18,
+                .linear_ranges = rk808_ldo6_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges),
+                .vsel_reg = RK808_LDO6_ON_VSEL_REG,
+                .vsel_mask = RK808_LDO_VSEL_MASK,
+                .enable_reg = RK808_LDO_EN_REG,
+                .enable_mask = BIT(5),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "LDO_REG7",
+                .id = RK808_ID_LDO7,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 18,
+                .linear_ranges = rk808_ldo6_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges),
+                .vsel_reg = RK808_LDO7_ON_VSEL_REG,
+                .vsel_mask = RK808_LDO_VSEL_MASK,
+                .enable_reg = RK808_LDO_EN_REG,
+                .enable_mask = BIT(6),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "LDO_REG8",
+                .id = RK808_ID_LDO8,
+                .ops = &rk808_reg_ops,
+                .type = REGULATOR_VOLTAGE,
+                .n_voltages = 17,
+                .linear_ranges = rk808_ldo_voltage_ranges,
+                .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges),
+                .vsel_reg = RK808_LDO8_ON_VSEL_REG,
+                .vsel_mask = RK808_LDO_VSEL_MASK,
+                .enable_reg = RK808_LDO_EN_REG,
+                .enable_mask = BIT(7),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "SWITCH_REG1",
+                .id = RK808_ID_SWITCH1,
+                .ops = &rk808_switch_ops,
+                .type = REGULATOR_VOLTAGE,
+                .enable_reg = RK808_DCDC_EN_REG,
+                .enable_mask = BIT(5),
+                .owner = THIS_MODULE,
+        }, {
+                .name = "SWITCH_REG2",
+                .id = RK808_ID_SWITCH2,
+                .ops = &rk808_switch_ops,
+                .type = REGULATOR_VOLTAGE,
+                .enable_reg = RK808_DCDC_EN_REG,
+                .enable_mask = BIT(6),
+                .owner = THIS_MODULE,
+        },
+};
+
+static struct of_regulator_match rk808_reg_matches[] = {
+        [RK808_ID_DCDC1]        = { .name = "DCDC_REG1" },
+        [RK808_ID_DCDC2]        = { .name = "DCDC_REG2" },
+        [RK808_ID_DCDC3]        = { .name = "DCDC_REG3" },
+        [RK808_ID_DCDC4]        = { .name = "DCDC_REG4" },
+        [RK808_ID_LDO1]         = { .name = "LDO_REG1" },
+        [RK808_ID_LDO2]         = { .name = "LDO_REG2" },
+        [RK808_ID_LDO3]         = { .name = "LDO_REG3" },
+        [RK808_ID_LDO4]         = { .name = "LDO_REG4" },
+        [RK808_ID_LDO5]         = { .name = "LDO_REG5" },
+        [RK808_ID_LDO6]         = { .name = "LDO_REG6" },
+        [RK808_ID_LDO7]         = { .name = "LDO_REG7" },
+        [RK808_ID_LDO8]         = { .name = "LDO_REG8" },
+        [RK808_ID_SWITCH1]      = { .name = "SWITCH_REG1" },
+        [RK808_ID_SWITCH2]      = { .name = "SWITCH_REG2" },
+};
+
+static int rk808_regulator_dts(struct rk808 *rk808)
+{
+        struct rk808_board *pdata = rk808->pdata;
+        struct device_node *np, *reg_np;
+        int i, ret;
+
+        np = rk808->dev->of_node;
+        if (!np) {
+                dev_err(rk808->dev, "could not find pmic sub-node\n");
+                return -ENXIO;
+        }
+
+        reg_np = of_get_child_by_name(np, "regulators");
+        if (!reg_np)
+                return -ENXIO;
+
+        ret = of_regulator_match(rk808->dev, reg_np, rk808_reg_matches,
+                                 RK808_NUM_REGULATORS);
+        if (ret  < 0) {
+                dev_err(rk808->dev,
+                        "failed to parse regulator data: %d\n", ret);
+                return ret;
+        }
+
+        for (i = 0; i < RK808_NUM_REGULATORS; i++) {
+                if (!rk808_reg_matches[i].init_data ||
+                    !rk808_reg_matches[i].of_node)
+                        continue;
+
+                pdata->rk808_init_data[i] = rk808_reg_matches[i].init_data;
+                pdata->of_node[i] = rk808_reg_matches[i].of_node;
+        }
+
+        return 0;
+}
+
+static int rk808_regulator_probe(struct platform_device *pdev)
+{
+        struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
+        struct rk808_board *pdata;
+        struct regulator_config config;
+        struct regulator_dev *rk808_rdev;
+        struct regulator_init_data *reg_data;
+        int i = 0;
+        int ret = 0;
+
+        dev_dbg(rk808->dev, "%s\n", __func__);
+
+        if (!rk808) {
+                dev_err(rk808->dev, "%s no rk808\n", __func__);
+                return -ENODEV;
+        }
+
+        pdata = rk808->pdata;
+        if (!pdata) {
+                dev_warn(rk808->dev, "%s no pdata, create it\n", __func__);
+                pdata = devm_kzalloc(rk808->dev, sizeof(*pdata), GFP_KERNEL);
+                if (!pdata)
+                        return -ENOMEM;
+        }
+
+        ret = rk808_regulator_dts(rk808);
+        if (ret)
+                return ret;
+
+        rk808->num_regulators = RK808_NUM_REGULATORS;
+        rk808->rdev = devm_kzalloc(&pdev->dev, RK808_NUM_REGULATORS *
+                                   sizeof(struct regulator_dev *), GFP_KERNEL);
+        if (!rk808->rdev)
+                return -ENOMEM;
+
+        /* Instantiate the regulators */
+        for (i = 0; i < RK808_NUM_REGULATORS; i++) {
+                reg_data = pdata->rk808_init_data[i];
+                if (!reg_data)
+                        continue;
+
+                config.dev = rk808->dev;
+                config.driver_data = rk808;
+                config.regmap = rk808->regmap;
+
+                if (rk808->dev->of_node)
+                        config.of_node = pdata->of_node[i];
+
+                reg_data->supply_regulator = rk808_reg[i].name;
+                config.init_data = reg_data;
+
+                rk808_rdev = devm_regulator_register(&pdev->dev,
+                                                     &rk808_reg[i], &config);
+                if (IS_ERR(rk808_rdev)) {
+                        dev_err(rk808->dev,
+                                "failed to register %d regulator\n", i);
+                        return PTR_ERR(rk808_rdev);
+                }
+                rk808->rdev[i] = rk808_rdev;
+        }
+        return 0;
+}
+
+static struct platform_driver rk808_regulator_driver = {
+        .probe = rk808_regulator_probe,
+        .driver = {
+                .name = "rk808-regulator",
+                .owner = THIS_MODULE,
+        },
+};
+
+module_platform_driver(rk808_regulator_driver);
+
+MODULE_DESCRIPTION("regulator driver for the rk808 series PMICs");
+MODULE_AUTHOR("Chris Zhong<zyw@rock-chips.com>");
+MODULE_AUTHOR("Zhang Qing<zhanqging@rock-chips.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rk808-regulator");