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regulator: core: Add support for disabling ramp delay
Some hardwares support disabling ramp delay, so adding ramp_disable flag to constraints. It will be used to figure out whether ramp_delay in constraints is explicitly set to zero or its unintialized (zero by default). And we don't need to call set_voltage_time_sel() for regulators for whom ramp delay is disabled in constraints. Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com> Signed-off-by: Mark Brown <broonie@linaro.org>
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@ -12,6 +12,8 @@ Optional properties:
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- regulator-allow-bypass: allow the regulator to go into bypass mode
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- <name>-supply: phandle to the parent supply/regulator node
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- regulator-ramp-delay: ramp delay for regulator(in uV/uS)
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For hardwares which support disabling ramp rate, it should be explicitly
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intialised to zero (regulator-ramp-delay = <0>) for disabling ramp delay.
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Deprecated properties:
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- regulator-compatible: If a regulator chip contains multiple
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@ -984,7 +984,8 @@ static int set_machine_constraints(struct regulator_dev *rdev,
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}
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}
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if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
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if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
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&& ops->set_ramp_delay) {
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ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
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if (ret < 0) {
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rdev_err(rdev, "failed to set ramp_delay\n");
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@ -2438,7 +2439,8 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
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}
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/* Call set_voltage_time_sel if successfully obtained old_selector */
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if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
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if (ret == 0 && !rdev->constraints->ramp_disable &&
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_regulator_is_enabled(rdev) && old_selector >= 0 &&
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old_selector != selector && rdev->desc->ops->set_voltage_time_sel) {
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delay = rdev->desc->ops->set_voltage_time_sel(rdev,
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@ -21,6 +21,7 @@ static void of_get_regulation_constraints(struct device_node *np,
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{
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const __be32 *min_uV, *max_uV, *uV_offset;
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const __be32 *min_uA, *max_uA, *ramp_delay;
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struct property *prop;
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struct regulation_constraints *constraints = &(*init_data)->constraints;
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constraints->name = of_get_property(np, "regulator-name", NULL);
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@ -64,9 +65,14 @@ static void of_get_regulation_constraints(struct device_node *np,
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if (of_property_read_bool(np, "regulator-allow-bypass"))
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constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
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ramp_delay = of_get_property(np, "regulator-ramp-delay", NULL);
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if (ramp_delay)
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prop = of_find_property(np, "regulator-ramp-delay", NULL);
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if (prop && prop->value) {
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ramp_delay = prop->value;
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if (*ramp_delay)
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constraints->ramp_delay = be32_to_cpu(*ramp_delay);
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else
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constraints->ramp_disable = true;
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}
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}
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/**
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@ -134,6 +134,7 @@ struct regulation_constraints {
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unsigned always_on:1; /* regulator never off when system is on */
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unsigned boot_on:1; /* bootloader/firmware enabled regulator */
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unsigned apply_uV:1; /* apply uV constraint if min == max */
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unsigned ramp_disable:1; /* disable ramp delay */
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};
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/**
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