linux-kernel - Re: [PATCH] drm/bridge: sil_sii8620: depend on INPUT instead of selecting it.

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Message-ID: <20190122211028.GK3264@pendragon.ideasonboard.com>
Date:   Tue, 22 Jan 2019 23:10:28 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ronald Tschalär <ronald@...ovation.ch>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Inki Dae <inki.dae@...sung.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: sil_sii8620: depend on INPUT instead of
 selecting it.

Hi Ronald,

Thank you for the patch.

On Tue, Jan 22, 2019 at 06:13:11AM -0800, Ronald Tschalär wrote:
> commit d6abe6df706c66d803e6dd4fe98c1b6b7f125a56 (drm/bridge:

Commits are usually quoted using the short 12 digits version of their
SHA-1.

> sil_sii8620: do not have a dependency of RC_CORE) added a dependency on
> INPUT. However, this causes problems with other drivers, in particular
> an input driver that depends on MFD_INTEL_LPSS_PCI (to be added in a
> future commit):
> 
>   drivers/clk/Kconfig:9:error: recursive dependency detected!
>   drivers/clk/Kconfig:9:        symbol COMMON_CLK is selected by MFD_INTEL_LPSS
>   drivers/mfd/Kconfig:566:      symbol MFD_INTEL_LPSS is selected by MFD_INTEL_LPSS_PCI
>   drivers/mfd/Kconfig:580:      symbol MFD_INTEL_LPSS_PCI is implied by KEYBOARD_APPLESPI
>   drivers/input/keyboard/Kconfig:73:    symbol KEYBOARD_APPLESPI depends on INPUT
>   drivers/input/Kconfig:8:      symbol INPUT is selected by DRM_SIL_SII8620
>   drivers/gpu/drm/bridge/Kconfig:83:    symbol DRM_SIL_SII8620 depends on DRM_BRIDGE
>   drivers/gpu/drm/bridge/Kconfig:1:     symbol DRM_BRIDGE is selected by DRM_PL111
>   drivers/gpu/drm/pl111/Kconfig:1:      symbol DRM_PL111 depends on COMMON_CLK
> 
> According to the docs, select should only be used for non-visible
> symbols. Furthermore almost all other references to INPUT throughout the
> kernel config are depends, not selects. Hence this change.
> 
> CC: Inki Dae <inki.dae@...sung.com>
> CC: Andrzej Hajda <a.hajda@...sung.com>
> Signed-off-by: Ronald Tschalär <ronald@...ovation.ch>
> ---
>  drivers/gpu/drm/bridge/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 2fee47b0d50b..eabedc83f25c 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -83,9 +83,9 @@ config DRM_PARADE_PS8622
>  config DRM_SIL_SII8620
>  	tristate "Silicon Image SII8620 HDMI/MHL bridge"
>  	depends on OF
> +	depends on INPUT
>  	select DRM_KMS_HELPER
>  	imply EXTCON
> -	select INPUT
>  	select RC_CORE

RC_CORE is always a user-visible symbol (which by the way depends on
INPUT). I think reverting commit d6abe6df706c would be a better
solution.

>  	help
>  	  Silicon Image SII8620 HDMI/MHL bridge chip driver.

-- 
Regards,

Laurent Pinchart