regulator: core: add regulator_get_linear_step()

Add regulator_get_linear_step(), which returns the voltage step size between VSEL values for linear regulators. This is intended for use by regulator consumers which build their own voltage-to-VSEL tables. Signed-off-by: Paul Walmsley <[email protected]> Reviewed-by: Andrew Chew <[email protected]> Cc: Matthew Longnecker <[email protected]> Signed-off-by: Mark Brown <[email protected]>
opendata26 · Jun 7, 2013 · 2a668a8 · 2a668a8
1 parent d683b96
commit 2a668a8
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diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
@@ -2134,6 +2134,21 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector)
 }
 EXPORT_SYMBOL_GPL(regulator_list_voltage);
 
+/**
+ * regulator_get_linear_step - return the voltage step size between VSEL values
+ * @regulator: regulator source
+ *
+ * Returns the voltage step size between VSEL values for linear
+ * regulators, or return 0 if the regulator isn't a linear regulator.
+ */
+unsigned int regulator_get_linear_step(struct regulator *regulator)
+{
+	struct regulator_dev *rdev = regulator->rdev;
+
+	return rdev->desc->uV_step;
+}
+EXPORT_SYMBOL_GPL(regulator_get_linear_step);
+
 /**
  * regulator_is_supported_voltage - check if a voltage range can be supported
  *

diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
@@ -165,6 +165,7 @@ int regulator_count_voltages(struct regulator *regulator);
 int regulator_list_voltage(struct regulator *regulator, unsigned selector);
 int regulator_is_supported_voltage(struct regulator *regulator,
 				   int min_uV, int max_uV);
+unsigned int regulator_get_linear_step(struct regulator *regulator);
 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
 int regulator_set_voltage_time(struct regulator *regulator,
 			       int old_uV, int new_uV);