linux-kernel - Re: [RFC PATCH] drm: rcar-du: make all sub-symbols depend on DRM_RCAR

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Date:   Fri, 6 Mar 2020 16:28:19 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Koji Matsuoka <koji.matsuoka.xm@...esas.com>,
        David Airlie <airlied@...ux.ie>
Subject: Re: [RFC PATCH] drm: rcar-du: make all sub-symbols depend on
 DRM_RCAR_DU

Hi Randy,

On Thu, Mar 05, 2020 at 07:17:49PM -0800, Randy Dunlap wrote:
> From: Randy Dunlap <rdunlap@...radead.org>
> 
> DRM_RCAR_CMM depends on DRM_RCAR_DU. Since the following Kconfig
> symbols do not depend on DRM_RCAR_DU, the menu presentation is
> broken for these and following non-R-Car Kconfig symbols.
> 
> Is it safe/appropriate to make all of these symbols depend on
> DRM_RCAR_DU?  It make the kconfig menu presentation much cleaner.

As those drivers are useless without DRM_RCAR_DU, I'm fine with this
change. It however prevents test-compiling those drivers when
DRM_RCAR_DU is disabled, but I see little reason to do so anyway, I
expect compile tests to aim for as large coverage as possible, and they
should thus enable DRM_RCAR_DU.

Would you like to submit a new version without this question, and
possibly addressing Geert's concern if you think it's appropriate, or
should I do so when applying ?

> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-renesas-soc@...r.kernel.org
> Cc: Koji Matsuoka <koji.matsuoka.xm@...esas.com>
> Cc: Dave Airlie <airlied@...ux.ie>
> ---
>  drivers/gpu/drm/rcar-du/Kconfig |    3 +++
>  1 file changed, 3 insertions(+)
> 
> --- linux-next-20200305.orig/drivers/gpu/drm/rcar-du/Kconfig
> +++ linux-next-20200305/drivers/gpu/drm/rcar-du/Kconfig
> @@ -24,6 +24,7 @@ config DRM_RCAR_CMM
>  config DRM_RCAR_DW_HDMI
>  	tristate "R-Car DU Gen3 HDMI Encoder Support"
>  	depends on DRM && OF
> +	depends on DRM_RCAR_DU
>  	select DRM_DW_HDMI
>  	help
>  	  Enable support for R-Car Gen3 internal HDMI encoder.
> @@ -31,6 +32,7 @@ config DRM_RCAR_DW_HDMI
>  config DRM_RCAR_LVDS
>  	tristate "R-Car DU LVDS Encoder Support"
>  	depends on DRM && DRM_BRIDGE && OF
> +	depends on DRM_RCAR_DU
>  	select DRM_PANEL
>  	select OF_FLATTREE
>  	select OF_OVERLAY
> @@ -47,4 +49,5 @@ config DRM_RCAR_VSP
>  
>  config DRM_RCAR_WRITEBACK
>  	bool
> +	depends on DRM_RCAR_DU
>  	default y if ARM64

Is this one needed ? The symbol should not be shown in the kconfig menu
as it has no text.

-- 
Regards,

Laurent Pinchart