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authorLaxman Dewangan <ldewangan@nvidia.com>2017-04-04 18:59:50 +0530
committerMark Brown <broonie@kernel.org>2017-04-05 18:25:10 +0100
commitd6c1dc3f52e3a65f35c58433ba57d14c0bad902f (patch)
tree9b0d994afe52df7445db81c207fe922842d6f1c4 /drivers/regulator
parentcfd2cedb482ae29ce13a3db46cc24f0c082ca9cf (diff)
downloadlinux-d6c1dc3f52e3a65f35c58433ba57d14c0bad902f.tar.bz2
regulator: Add settling time for non-linear voltage transition
Some regulators (some PWM regulators) have the voltage transition non-linear i.e. exponentially. On such cases, the settling time for voltage transition can not be presented in the voltage-ramp-delay. Add new property for non-linear voltage transition and handle this in getting the voltage settling time. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c2
-rw-r--r--drivers/regulator/of_regulator.c4
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 04baac9a165b..3a641d64f8e1 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2753,6 +2753,8 @@ static int _regulator_set_voltage_time(struct regulator_dev *rdev,
ramp_delay = rdev->constraints->ramp_delay;
else if (rdev->desc->ramp_delay)
ramp_delay = rdev->desc->ramp_delay;
+ else if (rdev->constraints->settling_time)
+ return rdev->constraints->settling_time;
if (ramp_delay == 0) {
rdev_dbg(rdev, "ramp_delay not set\n");
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 4f613ec99500..09d677d5d3f0 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -86,6 +86,10 @@ static void of_get_regulation_constraints(struct device_node *np,
constraints->ramp_disable = true;
}
+ ret = of_property_read_u32(np, "regulator-settling-time-us", &pval);
+ if (!ret)
+ constraints->settling_time = pval;
+
ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
if (!ret)
constraints->enable_time = pval;