From 1653ccf4c52df6a4abe8ec2f33f2cb2896d129ea Mon Sep 17 00:00:00 2001 From: Yadwinder Singh Brar Date: Sat, 29 Jun 2013 18:21:15 +0530 Subject: 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 Signed-off-by: Mark Brown diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt index 48a3b8e..2bd8f09 100644 --- a/Documentation/devicetree/bindings/regulator/regulator.txt +++ b/Documentation/devicetree/bindings/regulator/regulator.txt @@ -12,6 +12,8 @@ Optional properties: - regulator-allow-bypass: allow the regulator to go into bypass mode - -supply: phandle to the parent supply/regulator node - 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. Deprecated properties: - regulator-compatible: If a regulator chip contains multiple diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 288c75a..6e6371c 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -984,7 +984,8 @@ static int set_machine_constraints(struct regulator_dev *rdev, } } - if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { + if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) + && ops->set_ramp_delay) { ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); if (ret < 0) { rdev_err(rdev, "failed to set ramp_delay\n"); @@ -2438,7 +2439,8 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev, } /* Call set_voltage_time_sel if successfully obtained old_selector */ - if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && + if (ret == 0 && !rdev->constraints->ramp_disable && + _regulator_is_enabled(rdev) && old_selector >= 0 && old_selector != selector && rdev->desc->ops->set_voltage_time_sel) { delay = rdev->desc->ops->set_voltage_time_sel(rdev, diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c index f3c8f8f..7827384 100644 --- a/drivers/regulator/of_regulator.c +++ b/drivers/regulator/of_regulator.c @@ -21,6 +21,7 @@ static void of_get_regulation_constraints(struct device_node *np, { const __be32 *min_uV, *max_uV, *uV_offset; const __be32 *min_uA, *max_uA, *ramp_delay; + struct property *prop; struct regulation_constraints *constraints = &(*init_data)->constraints; constraints->name = of_get_property(np, "regulator-name", NULL); @@ -64,9 +65,14 @@ static void of_get_regulation_constraints(struct device_node *np, if (of_property_read_bool(np, "regulator-allow-bypass")) constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; - ramp_delay = of_get_property(np, "regulator-ramp-delay", NULL); - if (ramp_delay) - constraints->ramp_delay = be32_to_cpu(*ramp_delay); + prop = of_find_property(np, "regulator-ramp-delay", NULL); + if (prop && prop->value) { + ramp_delay = prop->value; + if (*ramp_delay) + constraints->ramp_delay = be32_to_cpu(*ramp_delay); + else + constraints->ramp_disable = true; + } } /** diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h index 36adbc8..999b20c 100644 --- a/include/linux/regulator/machine.h +++ b/include/linux/regulator/machine.h @@ -134,6 +134,7 @@ struct regulation_constraints { unsigned always_on:1; /* regulator never off when system is on */ unsigned boot_on:1; /* bootloader/firmware enabled regulator */ unsigned apply_uV:1; /* apply uV constraint if min == max */ + unsigned ramp_disable:1; /* disable ramp delay */ }; /** -- cgit v0.10.2 From 5b175952011adae30b531ab89cc24acb173b2ce4 Mon Sep 17 00:00:00 2001 From: Yadwinder Singh Brar Date: Sat, 29 Jun 2013 18:21:19 +0530 Subject: regulator: core: Remove redundant checks In function _regulator_do_set_voltage(), old_selector gets intialised only if (_regulator_is_enabled(rdev) && rdev->desc->ops->set_voltage_time_sel && rdev->desc->ops->get_voltage_sel)) is true. Before calling set_voltage_time_sel() we checks if (old_selector >= 0) and it will true if it got intialised properly. so we don't need to check again _regulator_is_enabled(rdev) && rdev->desc->ops->set_voltage_time_sel before calling set_voltage_time_sel(). Signed-off-by: Yadwinder Singh Brar Signed-off-by: Mark Brown diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 6e6371c..15368f3 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2439,9 +2439,8 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev, } /* Call set_voltage_time_sel if successfully obtained old_selector */ - if (ret == 0 && !rdev->constraints->ramp_disable && - _regulator_is_enabled(rdev) && old_selector >= 0 && - old_selector != selector && rdev->desc->ops->set_voltage_time_sel) { + if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 + && old_selector != selector) { delay = rdev->desc->ops->set_voltage_time_sel(rdev, old_selector, selector); -- cgit v0.10.2