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Subject[PATCH 11/15 v4] regulator: max8973: Let core handle GPIO descriptor
Date
The probe path of this driver is a bit complex: sometimes the
GPIO descriptor is passed to the regulator core, sometimes
it is not.

To handle it in a simple way: stick with the devm_* resource
management and unhinge the GPIO descriptor devres handling
right before passing it to the regulator core, if we pass it
to the regulator core.

Fixes: e7d2be696faa ("regulator: max8973: Pass descriptor instead of GPIO number")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v3->v4:
- Stick with devm_*, use devm_gpiod_unhinge() to handle the
descriptor for lifecycling in the regulator core as suggested
by Charles.
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.
- Fix the second case of devm_gpiod_get()
- Put a comment in the code so maintainers knows not to
use managed resources (devm*)
---
drivers/regulator/max8973-regulator.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/max8973-regulator.c b/drivers/regulator/max8973-regulator.c
index e7a58b509032..9aee1444181d 100644
--- a/drivers/regulator/max8973-regulator.c
+++ b/drivers/regulator/max8973-regulator.c
@@ -808,7 +808,13 @@ static int max8973_probe(struct i2c_client *client,
config.of_node = client->dev.of_node;
config.regmap = max->regmap;

- /* Register the regulators */
+ /*
+ * Register the regulators
+ * Turn the GPIO descriptor over to the regulator core for
+ * lifecycle management if we pass an ena_gpiod.
+ */
+ if (config.ena_gpiod)
+ devm_gpiod_unhinge(&client->dev, config.ena_gpiod);
rdev = devm_regulator_register(&client->dev, &max->desc, &config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
--
2.19.2
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