regulator: mt6311: Add support for mt6311 regulator

Add regulator support for mt6311.
It has 2 regulaotrs - Buck and LDO, provide the related buck/ldo voltage
data to the driver, and creates the regulator_desc table. Supported
operations for Buck are enabled/disabled and voltage change, only
enabled/disabled for LDO.

Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

5 files changed, 284 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index bef3bde6971b..aab09ac499a0 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -451,6 +451,15 @@ config REGULATOR_MC13892
           Say y here to support the regulators found on the Freescale MC13892
           PMIC.
 
+config REGULATOR_MT6311
+        tristate "MediaTek MT6311 PMIC"
+        depends on I2C
+        help
+          Say y here to select this option to enable the power regulator of
+          MediaTek MT6311 PMIC.
+          This driver supports the control of different power rails of device
+          through regulator interface.
+
 config REGULATOR_MT6397
         tristate "MediaTek MT6397 PMIC"
         depends on MFD_MT6397
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 91bf76267404..45e790f92715 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -60,6 +60,7 @@ obj-$(CONFIG_REGULATOR_MAX77843) += max77843.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
+obj-$(CONFIG_REGULATOR_MT6311) += mt6311-regulator.o
 obj-$(CONFIG_REGULATOR_MT6397)  += mt6397-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o
diff --git a/drivers/regulator/mt6311-regulator.c b/drivers/regulator/mt6311-regulator.c
new file mode 100644
index 000000000000..096e6202be1c
--- /dev/null
+++ b/drivers/regulator/mt6311-regulator.c
@@ -0,0 +1,180 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: Henry Chen <henryc.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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/err.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/mt6311.h>
+#include <linux/slab.h>
+#include "mt6311-regulator.h"
+
+static const struct regmap_config mt6311_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+        .max_register = MT6311_FQMTR_CON4,
+};
+
+/* Default limits measured in millivolts and milliamps */
+#define MT6311_MIN_UV           600000
+#define MT6311_MAX_UV           1400000
+#define MT6311_STEP_UV          6250
+
+static const struct regulator_linear_range buck_volt_range[] = {
+        REGULATOR_LINEAR_RANGE(MT6311_MIN_UV, 0, 0x7f, MT6311_STEP_UV),
+};
+
+static struct regulator_ops mt6311_buck_ops = {
+        .list_voltage = regulator_list_voltage_linear_range,
+        .map_voltage = regulator_map_voltage_linear_range,
+        .set_voltage_sel = regulator_set_voltage_sel_regmap,
+        .get_voltage_sel = regulator_get_voltage_sel_regmap,
+        .set_voltage_time_sel = regulator_set_voltage_time_sel,
+        .enable = regulator_enable_regmap,
+        .disable = regulator_disable_regmap,
+        .is_enabled = regulator_is_enabled_regmap,
+};
+
+static struct regulator_ops mt6311_ldo_ops = {
+        .enable = regulator_enable_regmap,
+        .disable = regulator_disable_regmap,
+        .is_enabled = regulator_is_enabled_regmap,
+};
+
+#define MT6311_BUCK(_id) \
+{\
+        .name = #_id,\
+        .ops = &mt6311_buck_ops,\
+        .of_match = of_match_ptr(#_id),\
+        .regulators_node = of_match_ptr("regulators"),\
+        .type = REGULATOR_VOLTAGE,\
+        .id = MT6311_ID_##_id,\
+        .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
+        .min_uV = MT6311_MIN_UV,\
+        .uV_step = MT6311_STEP_UV,\
+        .owner = THIS_MODULE,\
+        .linear_ranges = buck_volt_range, \
+        .n_linear_ranges = ARRAY_SIZE(buck_volt_range), \
+        .enable_reg = MT6311_VDVFS11_CON9,\
+        .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
+        .vsel_reg = MT6311_VDVFS11_CON12,\
+        .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
+}
+
+#define MT6311_LDO(_id) \
+{\
+        .name = #_id,\
+        .ops = &mt6311_ldo_ops,\
+        .of_match = of_match_ptr(#_id),\
+        .regulators_node = of_match_ptr("regulators"),\
+        .type = REGULATOR_VOLTAGE,\
+        .id = MT6311_ID_##_id,\
+        .owner = THIS_MODULE,\
+        .enable_reg = MT6311_LDO_CON3,\
+        .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
+}
+
+static struct regulator_desc mt6311_regulators[] = {
+        MT6311_BUCK(VDVFS),
+        MT6311_LDO(VBIASN),
+};
+
+/*
+ * I2C driver interface functions
+ */
+static int mt6311_i2c_probe(struct i2c_client *i2c,
+                const struct i2c_device_id *id)
+{
+        struct regulator_config config = { };
+        struct regulator_dev *rdev;
+        struct regmap *regmap;
+        int error, i, ret;
+        unsigned int data;
+
+        regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
+        if (IS_ERR(regmap)) {
+                error = PTR_ERR(regmap);
+                dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
+                        error);
+                return error;
+        }
+
+        ret = regmap_read(regmap, MT6311_SWCID, &data);
+        if (ret < 0) {
+                dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
+                return ret;
+        }
+
+        switch (data) {
+        case MT6311_E1_CID_CODE:
+        case MT6311_E2_CID_CODE:
+        case MT6311_E3_CID_CODE:
+                break;
+        default:
+                dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
+                return -ENODEV;
+        }
+
+        for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
+                config.dev = &i2c->dev;
+                config.regmap = regmap;
+
+                rdev = devm_regulator_register(&i2c->dev,
+                        &mt6311_regulators[i], &config);
+                if (IS_ERR(rdev)) {
+                        dev_err(&i2c->dev,
+                                "Failed to register MT6311 regulator\n");
+                        return PTR_ERR(rdev);
+                }
+        }
+
+        return 0;
+}
+
+static const struct i2c_device_id mt6311_i2c_id[] = {
+        {"mt6311", 0},
+        {},
+};
+MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id mt6311_dt_ids[] = {
+        { .compatible = "mediatek,mt6311-regulator",
+          .data = &mt6311_i2c_id[0] },
+        {},
+};
+MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
+#endif
+
+static struct i2c_driver mt6311_regulator_driver = {
+        .driver = {
+                .name = "mt6311",
+                .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(mt6311_dt_ids),
+        },
+        .probe = mt6311_i2c_probe,
+        .id_table = mt6311_i2c_id,
+};
+
+module_i2c_driver(mt6311_regulator_driver);
+
+MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
+MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/regulator/mt6311-regulator.h b/drivers/regulator/mt6311-regulator.h
new file mode 100644
index 000000000000..5218db46a798
--- /dev/null
+++ b/drivers/regulator/mt6311-regulator.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: Henry Chen <henryc.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __MT6311_REGULATOR_H__
+#define __MT6311_REGULATOR_H__
+
+#define MT6311_SWCID              0x01
+
+#define MT6311_TOP_INT_CON        0x18
+#define MT6311_TOP_INT_MON        0x19
+
+#define MT6311_VDVFS11_CON0       0x87
+#define MT6311_VDVFS11_CON7       0x88
+#define MT6311_VDVFS11_CON8       0x89
+#define MT6311_VDVFS11_CON9       0x8A
+#define MT6311_VDVFS11_CON10      0x8B
+#define MT6311_VDVFS11_CON11      0x8C
+#define MT6311_VDVFS11_CON12      0x8D
+#define MT6311_VDVFS11_CON13      0x8E
+#define MT6311_VDVFS11_CON14      0x8F
+#define MT6311_VDVFS11_CON15      0x90
+#define MT6311_VDVFS11_CON16      0x91
+#define MT6311_VDVFS11_CON17      0x92
+#define MT6311_VDVFS11_CON18      0x93
+#define MT6311_VDVFS11_CON19      0x94
+
+#define MT6311_LDO_CON0           0xCC
+#define MT6311_LDO_OCFB0          0xCD
+#define MT6311_LDO_CON2           0xCE
+#define MT6311_LDO_CON3           0xCF
+#define MT6311_LDO_CON4           0xD0
+#define MT6311_FQMTR_CON0         0xD1
+#define MT6311_FQMTR_CON1         0xD2
+#define MT6311_FQMTR_CON2         0xD3
+#define MT6311_FQMTR_CON3         0xD4
+#define MT6311_FQMTR_CON4         0xD5
+
+#define MT6311_PMIC_RG_INT_POL_MASK                      0x1
+#define MT6311_PMIC_RG_INT_EN_MASK                       0x2
+#define MT6311_PMIC_RG_BUCK_OC_INT_STATUS_MASK           0x10
+
+#define MT6311_PMIC_VDVFS11_EN_CTRL_MASK                 0x1
+#define MT6311_PMIC_VDVFS11_VOSEL_CTRL_MASK              0x2
+#define MT6311_PMIC_VDVFS11_EN_SEL_MASK                  0x3
+#define MT6311_PMIC_VDVFS11_VOSEL_SEL_MASK               0xc
+#define MT6311_PMIC_VDVFS11_EN_MASK                      0x1
+#define MT6311_PMIC_VDVFS11_VOSEL_MASK                   0x7F
+#define MT6311_PMIC_VDVFS11_VOSEL_ON_MASK                0x7F
+#define MT6311_PMIC_VDVFS11_VOSEL_SLEEP_MASK             0x7F
+#define MT6311_PMIC_NI_VDVFS11_VOSEL_MASK                0x7F
+
+#define MT6311_PMIC_RG_VBIASN_EN_MASK                    0x1
+
+#endif
diff --git a/include/linux/regulator/mt6311.h b/include/linux/regulator/mt6311.h
new file mode 100644
index 000000000000..8473259395b6
--- /dev/null
+++ b/include/linux/regulator/mt6311.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: Henry Chen <henryc.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __LINUX_REGULATOR_MT6311_H
+#define __LINUX_REGULATOR_MT6311_H
+
+#define MT6311_MAX_REGULATORS   2
+
+enum {
+        MT6311_ID_VDVFS = 0,
+        MT6311_ID_VBIASN,
+};
+
+#define MT6311_E1_CID_CODE    0x10
+#define MT6311_E2_CID_CODE    0x20
+#define MT6311_E3_CID_CODE    0x30
+
+#endif /* __LINUX_REGULATOR_MT6311_H */