Merge remote-tracking branches 'regulator/topic/da9211', 'regulator/t…

…opic/getreg', 'regulator/topic/gpio' and 'regulator/topic/lp872x' into regulator-next

Documentation/power/regulator/consumer.txt

@@ -180,3 +180,38 @@ int regulator_unregister_notifier(struct regulator *regulator,
 
 Regulators use the kernel notifier framework to send event to their interested
 consumers.
+
+7. Regulator Direct Register Access
+===================================
+Some kinds of power management hardware or firmware are designed such that
+they need to do low-level hardware access to regulators, with no involvement
+from the kernel. Examples of such devices are:
+
+- clocksource with a voltage-controlled oscillator and control logic to change
+  the supply voltage over I2C to achieve a desired output clock rate
+- thermal management firmware that can issue an arbitrary I2C transaction to
+  perform system poweroff during overtemperature conditions
+
+To set up such a device/firmware, various parameters like I2C address of the
+regulator, addresses of various regulator registers etc. need to be configured
+to it. The regulator framework provides the following helpers for querying
+these details.
+
+Bus-specific details, like I2C addresses or transfer rates are handled by the
+regmap framework. To get the regulator's regmap (if supported), use :-
+
+struct regmap *regulator_get_regmap(struct regulator *regulator);
+
+To obtain the hardware register offset and bitmask for the regulator's voltage
+selector register, use :-
+
+int regulator_get_hardware_vsel_register(struct regulator *regulator,
+					 unsigned *vsel_reg,
+					 unsigned *vsel_mask);
+
+To convert a regulator framework voltage selector code (used by
+regulator_list_voltage) to a hardware-specific voltage selector that can be
+directly written to the voltage selector register, use :-
+
+int regulator_list_hardware_vsel(struct regulator *regulator,
+				 unsigned selector);

drivers/regulator/Kconfig

@@ -198,6 +198,16 @@ config REGULATOR_DA9210
 	  converter 12A DC-DC Buck controlled through an I2C
 	  interface.
 
+config REGULATOR_DA9211
+	tristate "Dialog Semiconductor DA9211/DA9212 regulator"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say y here to support for the Dialog Semiconductor DA9211/DA9212.
+	  The DA9211/DA9212 is a multi-phase synchronous step down
+	  converter 12A DC-DC Buck controlled through an I2C
+	  interface.
+
 config REGULATOR_DBX500_PRCMU
 	bool
 

drivers/regulator/Makefile

@@ -27,6 +27,7 @@ obj-$(CONFIG_REGULATOR_DA9052)	+= da9052-regulator.o
 obj-$(CONFIG_REGULATOR_DA9055)	+= da9055-regulator.o
 obj-$(CONFIG_REGULATOR_DA9063)	+= da9063-regulator.o
 obj-$(CONFIG_REGULATOR_DA9210) += da9210-regulator.o
+obj-$(CONFIG_REGULATOR_DA9211) += da9211-regulator.o
 obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o
 obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_FAN53555) += fan53555.o

drivers/regulator/core.c

@@ -24,6 +24,7 @@
 #include <linux/suspend.h>
 #include <linux/delay.h>
 #include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/regulator/of_regulator.h>
@@ -77,7 +78,7 @@ struct regulator_map {
  */
 struct regulator_enable_gpio {
 	struct list_head list;
-	int gpio;
+	struct gpio_desc *gpiod;
 	u32 enable_count;	/* a number of enabled shared GPIO */
 	u32 request_count;	/* a number of requested shared GPIO */
 	unsigned int ena_gpio_invert:1;
@@ -1662,10 +1663,13 @@ static int regulator_ena_gpio_request(struct regulator_dev *rdev,
 				const struct regulator_config *config)
 {
 	struct regulator_enable_gpio *pin;
+	struct gpio_desc *gpiod;
 	int ret;
 
+	gpiod = gpio_to_desc(config->ena_gpio);
+
 	list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
-		if (pin->gpio == config->ena_gpio) {
+		if (pin->gpiod == gpiod) {
 			rdev_dbg(rdev, "GPIO %d is already used\n",
 				config->ena_gpio);
 			goto update_ena_gpio_to_rdev;
@@ -1684,7 +1688,7 @@ static int regulator_ena_gpio_request(struct regulator_dev *rdev,
 		return -ENOMEM;
 	}
 
-	pin->gpio = config->ena_gpio;
+	pin->gpiod = gpiod;
 	pin->ena_gpio_invert = config->ena_gpio_invert;
 	list_add(&pin->list, &regulator_ena_gpio_list);
 
@@ -1703,10 +1707,10 @@ static void regulator_ena_gpio_free(struct regulator_dev *rdev)
 
 	/* Free the GPIO only in case of no use */
 	list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
-		if (pin->gpio == rdev->ena_pin->gpio) {
+		if (pin->gpiod == rdev->ena_pin->gpiod) {
 			if (pin->request_count <= 1) {
 				pin->request_count = 0;
-				gpio_free(pin->gpio);
+				gpiod_put(pin->gpiod);
 				list_del(&pin->list);
 				kfree(pin);
 			} else {
@@ -1734,8 +1738,8 @@ static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
 	if (enable) {
 		/* Enable GPIO at initial use */
 		if (pin->enable_count == 0)
-			gpio_set_value_cansleep(pin->gpio,
-						!pin->ena_gpio_invert);
+			gpiod_set_value_cansleep(pin->gpiod,
+						 !pin->ena_gpio_invert);
 
 		pin->enable_count++;
 	} else {
@@ -1746,8 +1750,8 @@ static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
 
 		/* Disable GPIO if not used */
 		if (pin->enable_count <= 1) {
-			gpio_set_value_cansleep(pin->gpio,
-						pin->ena_gpio_invert);
+			gpiod_set_value_cansleep(pin->gpiod,
+						 pin->ena_gpio_invert);
 			pin->enable_count = 0;
 		}
 	}
@@ -2234,6 +2238,77 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector)
 }
 EXPORT_SYMBOL_GPL(regulator_list_voltage);
 
+/**
+ * regulator_get_regmap - get the regulator's register map
+ * @regulator: regulator source
+ *
+ * Returns the register map for the given regulator, or an ERR_PTR value
+ * if the regulator doesn't use regmap.
+ */
+struct regmap *regulator_get_regmap(struct regulator *regulator)
+{
+	struct regmap *map = regulator->rdev->regmap;
+
+	return map ? map : ERR_PTR(-EOPNOTSUPP);
+}
+
+/**
+ * regulator_get_hardware_vsel_register - get the HW voltage selector register
+ * @regulator: regulator source
+ * @vsel_reg: voltage selector register, output parameter
+ * @vsel_mask: mask for voltage selector bitfield, output parameter
+ *
+ * Returns the hardware register offset and bitmask used for setting the
+ * regulator voltage. This might be useful when configuring voltage-scaling
+ * hardware or firmware that can make I2C requests behind the kernel's back,
+ * for example.
+ *
+ * On success, the output parameters @vsel_reg and @vsel_mask are filled in
+ * and 0 is returned, otherwise a negative errno is returned.
+ */
+int regulator_get_hardware_vsel_register(struct regulator *regulator,
+					 unsigned *vsel_reg,
+					 unsigned *vsel_mask)
+{
+	struct regulator_dev	*rdev = regulator->rdev;
+	struct regulator_ops	*ops = rdev->desc->ops;
+
+	if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
+		return -EOPNOTSUPP;
+
+	 *vsel_reg = rdev->desc->vsel_reg;
+	 *vsel_mask = rdev->desc->vsel_mask;
+
+	 return 0;
+}
+EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
+
+/**
+ * regulator_list_hardware_vsel - get the HW-specific register value for a selector
+ * @regulator: regulator source
+ * @selector: identify voltage to list
+ *
+ * Converts the selector to a hardware-specific voltage selector that can be
+ * directly written to the regulator registers. The address of the voltage
+ * register can be determined by calling @regulator_get_hardware_vsel_register.
+ *
+ * On error a negative errno is returned.
+ */
+int regulator_list_hardware_vsel(struct regulator *regulator,
+				 unsigned selector)
+{
+	struct regulator_dev	*rdev = regulator->rdev;
+	struct regulator_ops	*ops = rdev->desc->ops;
+
+	if (selector >= rdev->desc->n_voltages)
+		return -EINVAL;
+	if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
+		return -EOPNOTSUPP;
+
+	return selector;
+}
+EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
+
 /**
  * regulator_get_linear_step - return the voltage step size between VSEL values
  * @regulator: regulator source