linux-kernel - Re: [PATCH 1/2] regmap: soundwire: fix Kconfig select/depend issue

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Date:   Fri, 12 Apr 2019 10:38:19 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        broonie@...nel.org, vkoul@...nel.org, gregkh@...uxfoundation.org,
        liam.r.girdwood@...ux.intel.com, jank@...ence.com, joe@...ches.com,
        srinivas.kandagatla@...aro.org,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH 1/2] regmap: soundwire: fix Kconfig select/depend issue

On Thu, 11 Apr 2019 21:28:13 +0200,
Pierre-Louis Bossart wrote:
> 
> The mechanism should be
> 
> config CODEC_XYX_SDW
>        depends on SOUNDWIRE
>        select REGMAP_SOUNDWIRE
> 
> config REGMAP_SOUNDWIRE
>        depends on SOUNDWIRE
>        select SOUNDWIRE_BUS

To be noted, in general you can't do put both depends-on and select.
The select always wins.  So the depends-on in REGMAP_SOUNDWIRE is more
or less moot.


thanks,

Takashi

> SOUNDWIRE_BUS can be independently selected by the SOC driver. The SOC
> driver should not know or care about REGMAP_SOUNDWIRE.
> 
> Fixes: 7c22ce6e2184 ('03fc8746f7915b5a391d8227f7e1')
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> ---
>  drivers/base/regmap/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
> index 6ad5ef48b61e..4e422afe3c0d 100644
> --- a/drivers/base/regmap/Kconfig
> +++ b/drivers/base/regmap/Kconfig
> @@ -44,7 +44,8 @@ config REGMAP_IRQ
>  
>  config REGMAP_SOUNDWIRE
>  	tristate
> -	depends on SOUNDWIRE_BUS
> +	depends on SOUNDWIRE
> +	select SOUNDWIRE_BUS
>  
>  config REGMAP_SCCB
>  	tristate
> -- 
> 2.17.1
>