linux-kernel - [PATCH] regulator: change devm_regulator_get_enable

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Date: Tue, 23 Apr 2024 14:38:28 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
	Matti Vaittinen <mazziesaccount@...il.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org, Aleksander Mazur <deweloper@...pl>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH] regulator: change devm_regulator_get_enable_optional() stub
 to return Ok

The devm_regulator_get_enable_optional() should be a 'call and forget'
API, meaning, when it is used to enable the regulators, the API does not
provide a handle to do any further control of the regulators. It gives
no real benefit to return an error from the stub if CONFIG_REGULATOR is
not set.

On the contrary, returning an error is causing problems to drivers when
hardware is such it works out just fine with no regulator control.
Returning an error forces drivers to specifically handle the case where
CONFIG_REGULATOR is not set, making the mere existence of the stub
questionalble.

Change the stub implementation for the
devm_regulator_get_enable_optional() to return Ok so drivers do not
separately handle the case where the CONFIG_REGULATOR is not set.

Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
Fixes: da279e6965b3 ("regulator: Add devm helpers for get and enable")
---
 include/linux/regulator/consumer.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 71232fb7dda3..ed180ca419da 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -326,7 +326,7 @@ static inline int devm_regulator_get_enable(struct device *dev, const char *id)
 static inline int devm_regulator_get_enable_optional(struct device *dev,
 						     const char *id)
 {
-	return -ENODEV;
+	return 0;
 }

 static inline struct regulator *__must_check

base-commit: f7638784bd0cf2ca9daebd47477983811f832300
-- 
2.43.2

-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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