linux-kernel - [PATCH 05/15 v3] regulator: max8952: Let core handle GPIO descriptor

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Date:   Wed,  5 Dec 2018 13:47:11 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 05/15 v3] regulator: max8952: Let core handle GPIO descriptor

Use the gpiod_get() rather than the devm_* version so that the
regulator core can handle the lifecycle of these descriptors.

Fixes: d7a261c2d1f2 ("regulator: max8952: Pass descriptor instead of GPIO number")
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
ChangeLog v2->v3:
- Resending.
ChangeLog v1->v2:
- Drop the gpiod_put() on the errorpath after devm_regulator_register()
  as this will be handled by the regulator core.
- Put a comment in the code so maintainers knows not to
  use managed resources (devm*)
---
 drivers/regulator/max8952.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/max8952.c b/drivers/regulator/max8952.c
index 6c39fff73b8a..cf2a2912cb1b 100644
--- a/drivers/regulator/max8952.c
+++ b/drivers/regulator/max8952.c
@@ -231,9 +231,13 @@ static int max8952_pmic_probe(struct i2c_client *client,
 	else
 		gflags = GPIOD_OUT_LOW;
 	gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
-	gpiod = devm_gpiod_get_optional(&client->dev,
-					"max8952,en",
-					gflags);
+	/*
+	 * Do not use devm* here: the regulator core takes over the
+	 * lifecycle management of the GPIO descriptor.
+	 */
+	gpiod = gpiod_get_optional(&client->dev,
+				   "max8952,en",
+				   gflags);
 	if (IS_ERR(gpiod))
 		return PTR_ERR(gpiod);
 	if (gpiod)
-- 
2.19.2