regulator: core: Support for continuous voltage range

Some regulators can set any voltage within the constraints range,
not being limited to specified operating points.

This patch makes it possible to describe such regulator and makes
the regulator_is_supported_voltage() function behave correctly.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 5c4829cba6a62de6168c6bb3c4913812e5e8b4e1..f7c74db7465cefa6b375b19ab986f36eda0e7a1c 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1979,6 +1979,11 @@ int regulator_is_supported_voltage(struct regulator *regulator,
                        return ret;
        }
 
+       /* Any voltage within constrains range is fine? */
+       if (rdev->desc->continuous_voltage_range)
+               return min_uV >= rdev->constraints->min_uV &&
+                               max_uV <= rdev->constraints->max_uV;
+
        ret = regulator_count_voltages(regulator);
        if (ret < 0)
                return ret;

diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 7932a3bf21bdba89f84275b7b990bcaa3a5773b0..f2b72b230b9ba495965c1b5fa4ddd1d619e10608 100644 (file)
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -181,6 +181,8 @@ enum regulator_type {
  * @type: Indicates if the regulator is a voltage or current regulator.
  * @owner: Module providing the regulator, used for refcounting.
  *
+ * @continuous_voltage_range: Indicates if the regulator can set any
+ *                            voltage within constrains range.
  * @n_voltages: Number of selectors available for ops.list_voltage().
  *
  * @min_uV: Voltage given by the lowest selector (if linear mapping)
@@ -199,6 +201,7 @@ struct regulator_desc {
        const char *name;
        const char *supply_name;
        int id;
+       bool continuous_voltage_range;
        unsigned n_voltages;
        struct regulator_ops *ops;
        int irq;