[PATCH v2 2/7] Adding Skyworks SKY81452 regulator driver

Gyungoh Yoo
2014-08-28T10:46:49Z

v2:
Added 'compatible' attribute in the driver
Added message for exception or errors.

---
drivers/regulator/Kconfig | 11 +++
drivers/regulator/Makefile | 1 +
drivers/regulator/sky81452-regulator.c | 140 +++++++++++++++++++++++++++++++++
3 files changed, 152 insertions(+)
create mode 100644 drivers/regulator/sky81452-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 2dc8289..2b05964 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 MFD_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 aa4a6aa..d8206ec 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 0000000..b9c54c6
--- /dev/null
+++ b/drivers/regulator/sky81452-regulator.c
@@ -0,0 +1,140 @@
+/*
+ * 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 = of_node_get(dev->of_node);
+
+ if (!np) {
+ dev_err(dev, "regulator node not found");
+ return ERR_PTR(-ENODATA);
+ }
+
+ 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)) {
+ dev_err(dev, "failed to register regulator:%d", PTR_ERR(rdev));
+ return PTR_ERR(rdev);
+ }
+
+ platform_set_drvdata(pdev, rdev);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_reg_of_match[] = {
+ { .compatible = "skyworks,sky81452-regulator", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sky81452_reg_of_match);
+#endif
+
+static struct platform_driver sky81452_reg_driver = {
+ .driver = {
+ .name = "sky81452-regulator",
+ .of_match_table = of_match_ptr(sky81452_reg_of_match),
+ },
+ .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("1.1");
--
1.9.1