[PATCH] regulator: core: add regulator_get_linear_step()

From: Paul Walmsley
Date: Fri Jun 07 2013 - 04:07:06 EST

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 <pwalmsley@xxxxxxxxxx>
Reviewed-by: Andrew Chew <achew@xxxxxxxxxx>
Cc: Matthew Longnecker <mlongnecker@xxxxxxxxxx>

Applies on v3.10-rc4. Will be used by the upcoming Tegra DFLL clocksource
driver, which will build its own table of voltage-to-VSEL values by
querying the regulator framework.

drivers/regulator/core.c | 15 +++++++++++++++
include/linux/regulator/consumer.h | 1 +
2 files changed, 16 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 6e50178..f07d7ad 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2135,6 +2135,21 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector)

+ * 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;
* regulator_is_supported_voltage - check if a voltage range can be supported
* @regulator: Regulator to check.
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 145022a..3a76389c 100644
--- 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);

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