linux-kernel - Applied "regulator: pwm: implement ->enable(), ->disable() and ->is

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Date:	Mon, 21 Sep 2015 14:15:12 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Applied "regulator: pwm: implement ->enable(), ->disable() and ->is_enabled methods" to the regulator tree

The patch

   regulator: pwm: implement ->enable(), ->disable() and ->is_enabled methods

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 1de7d80246a047edaa4ea7de225437571a3aec34 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
Date: Mon, 21 Sep 2015 11:33:28 +0200
Subject: [PATCH] regulator: pwm: implement ->enable(), ->disable() and
 ->is_enabled methods

Implement the ->enable(), ->disable() and ->is_enabled methods and remove
the PWM call in ->set_voltage_sel().
This is particularly important for critical regulators tagged as always-on,
because not claiming the PWM (and its dependencies) might lead to
unpredictable behavior (like a system hang because the PWM clk is only
claimed when the PWM device is enabled).

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/regulator/pwm-regulator.c | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index fc3166d..3aca067b 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -69,12 +69,6 @@ static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev,
 
 	drvdata->state = selector;
 
-	ret = pwm_enable(drvdata->pwm);
-	if (ret) {
-		dev_err(&rdev->dev, "Failed to enable PWM\n");
-		return ret;
-	}
-
 	return 0;
 }
 
@@ -89,6 +83,29 @@ static int pwm_regulator_list_voltage(struct regulator_dev *rdev,
 	return drvdata->duty_cycle_table[selector].uV;
 }
 
+static int pwm_regulator_enable(struct regulator_dev *dev)
+{
+	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
+
+	return pwm_enable(drvdata->pwm);
+}
+
+static int pwm_regulator_disable(struct regulator_dev *dev)
+{
+	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
+
+	pwm_disable(drvdata->pwm);
+
+	return 0;
+}
+
+static int pwm_regulator_is_enabled(struct regulator_dev *dev)
+{
+	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
+
+	return pwm_is_enabled(drvdata->pwm);
+}
+
 /**
  * Continuous voltage call-backs
  */
@@ -144,11 +161,17 @@ static struct regulator_ops pwm_regulator_voltage_table_ops = {
 	.get_voltage_sel = pwm_regulator_get_voltage_sel,
 	.list_voltage    = pwm_regulator_list_voltage,
 	.map_voltage     = regulator_map_voltage_iterate,
+	.enable          = pwm_regulator_enable,
+	.disable         = pwm_regulator_disable,
+	.is_enabled      = pwm_regulator_is_enabled,
 };
 
 static struct regulator_ops pwm_regulator_voltage_continuous_ops = {
 	.get_voltage = pwm_regulator_get_voltage,
 	.set_voltage = pwm_regulator_set_voltage,
+	.enable          = pwm_regulator_enable,
+	.disable         = pwm_regulator_disable,
+	.is_enabled      = pwm_regulator_is_enabled,
 };
 
 static struct regulator_desc pwm_regulator_desc = {
-- 
2.5.0

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