linux-kernel - Re: [PATCH 3/3] leds: Kconfig: leds-st1202: add select for required LEDS_TRIGGER

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Message-ID: <20250306234727.GD8350@google.com>
Date: Thu, 6 Mar 2025 15:47:27 -0800
From: Lee Jones <lee@...nel.org>
To: Manuel Fombuena <fombuena@...look.com>
Cc: pavel@....cz, linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] leds: Kconfig: leds-st1202: add select for required
 LEDS_TRIGGER_PATTERN

On Wed, 26 Feb 2025, Manuel Fombuena wrote:

> leds-st1202 requires the LED Pattern Trigger (LEDS_TRIGGER_PATTERN), which
> is not selected when LED Trigger support is (LEDS_TRIGGERS).
> 
> To reproduce this:
> 
> - make menuconfig KCONFIG_CONFIG=
> - select LEDS_ST1202 dependencies OF, I2C and LEDS_CLASS.
> - select LEDS_ST1202
> - LEDS_TRIGGERS is selected but LEDS_TRIGGER_PATTERN isn't.
> 
> The absence of LEDS_TRIGGER_PATTERN explicitly required can lead to builds
> in which LEDS_ST1202 is selected while LEDS_TRIGGER_PATTERN isn't. The direct
> result of that would be that /sys/class/leds/<led>/hw_pattern wouldn't be
> available and there would be no way of interacting with the driver and
> hardware from user space.
> 
> Add select LEDS_TRIGGER_PATTERN to Kconfig to meet the requirement and
> indirectly document it as well.
> 
> Signed-off-by: Manuel Fombuena <fombuena@...look.com>
> ---
>  drivers/leds/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 2b27d043921c..8859e8fe292a 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -971,6 +971,7 @@ config LEDS_ST1202
>  	depends on I2C
>  	depends on OF
>  	select LEDS_TRIGGERS
> +	select LEDS_TRIGGER_PATTERN

Don't you need both?

>  	help
>  	  Say Y to enable support for LEDs connected to LED1202
>  	  LED driver chips accessed via the I2C bus.
> -- 
> 2.48.1
> 

-- 
Lee Jones [李琼斯]