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@gmail.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 =] 

On Tue, 23 Apr 2024 14:38:28 +0300, Matti Vaittinen wrote:
> 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.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-next

Thanks!

[1/1] regulator: change devm_regulator_get_enable_optional() stub to return Ok
      commit: ff33132605c1a0acea59e4c523cb7c6fabe856b2

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

On Tue, Apr 23, 2024 at 02:38:28PM +0300, Matti Vaittinen wrote:
> 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@gmail.com>
> Fixes: da279e6965b3 ("regulator: Add devm helpers for get and enable")

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  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 =]