4 files changed, 158 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
new file mode 100644
index 000000000000..882455e9b36d
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/sky81452-regulator.txt
@@ -0,0 +1,16 @@
+SKY81452 voltage regulator
+
+Required properties:
+- any required generic properties defined in regulator.txt
+
+Optional properties:
+- any available generic properties defined in regulator.txt
+
+Example:
+
+        regulator {
+                /* generic regulator properties */
+                regulator-name = "touch_en";
+                regulator-min-microvolt = <4500000>;
+                regulator-max-microvolt = <8000000>;
+        };
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 2dc8289e5dba..f6bf208f0fca 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -483,6 +483,17 @@ 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_SKY81452
+        tristate "Skyworks Solutions SKY81452 voltage regulator"
+        depends on SKY81452
+        help
+          This driver supports Skyworks SKY81452 voltage output regulator
+          via I2C bus. SKY81452 has one voltage linear regulator can be
+          programmed from 4.5V to 20V.
+
+          This driver can also be built as a module. If so, the module
+          will be called sky81452-regulator.
+
 config REGULATOR_ST_PWM
         tristate "STMicroelectronics PWM voltage regulator"
         depends on ARCH_STI
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index aa4a6aa7b558..d8206ec63d15 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_REGULATOR_RC5T583)  += rc5t583-regulator.o
 obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
+obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o
 obj-$(CONFIG_REGULATOR_ST_PWM) += st-pwm.o
 obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
 obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
diff --git a/drivers/regulator/sky81452-regulator.c b/drivers/regulator/sky81452-regulator.c
new file mode 100644
index 000000000000..97aff0ccd65f
--- /dev/null
+++ b/drivers/regulator/sky81452-regulator.c
@@ -0,0 +1,130 @@
+/*
+ * sky81452-regulator.c SKY81452 regulator driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+/* registers */
+#define SKY81452_REG1   0x01
+#define SKY81452_REG3   0x03
+
+/* bit mask */
+#define SKY81452_LEN    0x40
+#define SKY81452_LOUT   0x1F
+
+static struct regulator_ops sky81452_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 const struct regulator_linear_range sky81452_reg_ranges[] = {
+        REGULATOR_LINEAR_RANGE(4500000, 0, 14, 250000),
+        REGULATOR_LINEAR_RANGE(9000000, 15, 31, 1000000),
+};
+
+static const struct regulator_desc sky81452_reg = {
+        .name = "LOUT",
+        .ops = &sky81452_reg_ops,
+        .type = REGULATOR_VOLTAGE,
+        .owner = THIS_MODULE,
+        .n_voltages = SKY81452_LOUT + 1,
+        .linear_ranges = sky81452_reg_ranges,
+        .n_linear_ranges = ARRAY_SIZE(sky81452_reg_ranges),
+        .vsel_reg = SKY81452_REG3,
+        .vsel_mask = SKY81452_LOUT,
+        .enable_reg = SKY81452_REG1,
+        .enable_mask = SKY81452_LEN,
+};
+
+#ifdef CONFIG_OF
+static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
+{
+        struct regulator_init_data *init_data;
+        struct device_node *np;
+
+        np = of_get_child_by_name(dev->parent->of_node, "regulator");
+        if (unlikely(!np)) {
+                dev_err(dev, "regulator node not found");
+                return NULL;
+        }
+
+        init_data = of_get_regulator_init_data(dev, np);
+
+        of_node_put(np);
+        return init_data;
+}
+#else
+static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
+{
+        return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int sky81452_reg_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        const struct regulator_init_data *init_data = dev_get_platdata(dev);
+        struct regulator_config config = { };
+        struct regulator_dev *rdev;
+
+        if (!init_data) {
+                init_data = sky81452_reg_parse_dt(dev);
+                if (IS_ERR(init_data))
+                        return PTR_ERR(init_data);
+        }
+
+        config.dev = dev;
+        config.init_data = init_data;
+        config.of_node = dev->of_node;
+        config.regmap = dev_get_drvdata(dev->parent);
+
+        rdev = devm_regulator_register(dev, &sky81452_reg, &config);
+        if (IS_ERR(rdev))
+                return PTR_ERR(rdev);
+
+        platform_set_drvdata(pdev, rdev);
+
+        return 0;
+}
+
+static struct platform_driver sky81452_reg_driver = {
+        .driver = {
+                .name = "sky81452-regulator",
+        },
+        .probe = sky81452_reg_probe,
+};
+
+module_platform_driver(sky81452_reg_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");