linux-kernel - Re: [PATCH] drm/vc4: Enable selection in Kconfig on any BCM platform.

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Date:   Mon, 8 May 2017 11:30:40 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Eric Anholt <eric@...olt.net>, dri-devel@...ts.freedesktop.org,
        bcm-kernel-feedback-list@...adcom.com, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>
Cc:     linux-kernel@...r.kernel.org, mircea.carausu@...adcom.com
Subject: Re: [PATCH] drm/vc4: Enable selection in Kconfig on any BCM platform.

On 05/08/2017 11:18 AM, Eric Anholt wrote:
> With the Cygnus port, we needed to add at least "|| ARCH_BCM_CYGNUS"
> to let the module get built on a cygnus-only kernel.  However, I
> anticipate having a port for Kona soon, so just present the module on
> all of BCM.

This seems reasonable, but by replacing ARCH_BCM2835 which is common to
ARM/Linux and ARM64/Linux, you are no longer allowing an ARM64 systems
to benefit from this driver unless COMPILE_TEST is also selected, right?

This could be:

depends on COMPILE_TEST
depends on ARCH_BCM # 32-bit ARM
depends on ARCH_BCM2835 || ARCH_BCM_IPROC # 64-bit ARM

or maybe down to just:

depends on COMPILE_TEST

and let DRM, COMMON_CLK and SND drive the bulk of the dependencies?

> 
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
> 
> I would be sending this through drm-misc-next, assuming BCM
> maintainers like it.
> 
>  drivers/gpu/drm/vc4/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig
> index 973b4203c0b2..f136813abf56 100644
> --- a/drivers/gpu/drm/vc4/Kconfig
> +++ b/drivers/gpu/drm/vc4/Kconfig
> @@ -1,6 +1,6 @@
>  config DRM_VC4
>  	tristate "Broadcom VC4 Graphics"
> -	depends on ARCH_BCM2835 || COMPILE_TEST
> +	depends on ARCH_BCM || COMPILE_TEST
>  	depends on DRM
>  	depends on SND && SND_SOC
>  	depends on COMMON_CLK
> 


-- 
Florian