regulator: core: add support for configuring turn-on time through constraints

The turn-on time of the regulator depends on the regulator device's
electrical characteristics. Sometimes regulator turn-on time also
depends on the capacitive load on the given platform and it can be
more than the datasheet value.

The driver provides the enable-time as per datasheet.

Add support for configure the enable ramp time through regulator
constraints so that regulator core can take this value for enable
time for that regulator.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
index 2bd8f09787659269bb03847b3517cff2b52cfca9..e2c7f1e7251a3a16c922c50d10f8b8f50ee750cb 100644 (file)
--- a/Documentation/devicetree/bindings/regulator/regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/regulator.txt
@@ -14,6 +14,11 @@ Optional properties:
 - regulator-ramp-delay: ramp delay for regulator(in uV/uS)
   For hardwares which support disabling ramp rate, it should be explicitly
   intialised to zero (regulator-ramp-delay = <0>) for disabling ramp delay.
+- regulator-enable-ramp-delay: The time taken, in microseconds, for the supply
+  rail to reach the target voltage, plus/minus whatever tolerance the board
+  design requires. This property describes the total system ramp time
+  required due to the combination of internal ramping of the regulator itself,
+  and board design issues such as trace capacitance and load on the supply.
 
 Deprecated properties:
 - regulator-compatible: If a regulator chip contains multiple

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index a01b8b3b70ca2fc3adb4e81d7f96358282115ba4..5217c1964c3224af8520c6addcedcb35155b0199 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1186,6 +1186,8 @@ overflow_err:
 
 static int _regulator_get_enable_time(struct regulator_dev *rdev)
 {
+       if (rdev->constraints && rdev->constraints->enable_time)
+               return rdev->constraints->enable_time;
        if (!rdev->desc->ops->enable_time)
                return rdev->desc->enable_time;
        return rdev->desc->ops->enable_time(rdev);

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 7827384680d64a7f62b5e248d687953e5ca8ae7b..ea4f36f2cbe2f1e5432e594711fdb5d4c2c677c6 100644 (file)
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -23,6 +23,8 @@ static void of_get_regulation_constraints(struct device_node *np,
        const __be32 *min_uA, *max_uA, *ramp_delay;
        struct property *prop;
        struct regulation_constraints *constraints = &(*init_data)->constraints;
+       int ret;
+       u32 pval;
 
        constraints->name = of_get_property(np, "regulator-name", NULL);
 
@@ -73,6 +75,10 @@ static void of_get_regulation_constraints(struct device_node *np,
                else
                        constraints->ramp_disable = true;
        }
+
+       ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
+       if (!ret)
+               constraints->enable_time = pval;
 }
 
 /**

diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index 999b20ce06cf349185f008388e12e64c70518196..8108751acb86cb4ece223abc9f5f87c6c07aed4f 100644 (file)
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -95,6 +95,7 @@ struct regulator_state {
  * @initial_state: Suspend state to set by default.
  * @initial_mode: Mode to set at startup.
  * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
+ * @enable_time: Turn-on time of the rails (unit: microseconds)
  */
 struct regulation_constraints {
 
@@ -129,6 +130,7 @@ struct regulation_constraints {
        unsigned int initial_mode;
 
        unsigned int ramp_delay;
+       unsigned int enable_time;
 
        /* constraint flags */
        unsigned always_on:1;   /* regulator never off when system is on */