linux-kernel - Re: [PATCH 00/04] pinctrl: sh-pfc: r8a7794: DU support

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Message-ID: <2997631.z1xUhmAZzM@avalon>
Date:	Fri, 20 Nov 2015 04:46:50 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	linux-sh@...r.kernel.org, linus.walleij@...aro.org,
	linux-kernel@...r.kernel.org, koji.matsuoka.xm@...esas.com,
	linux-gpio@...r.kernel.org, horms@...ge.net.au, geert@...der.be
Subject: Re: [PATCH 00/04] pinctrl: sh-pfc: r8a7794: DU support

Hi Magnus,

Thank you for the patch.

On Tuesday 17 November 2015 12:18:32 Magnus Damm wrote:
> pinctrl: sh-pfc: r8a7794: DU support
> 
> [PATCH 01/04] pinctrl: sh-pfc: r8a7794: Add DU pin groups
> [PATCH 02/04] pinctrl: sh-pfc: r8a7794: Separate DU CDE and DISP
> [PATCH 03/04] pinctrl: sh-pfc: r8a7794: Add missing dot clock signals
> [PATCH 04/04] pinctrl: sh-pfc: r8a7794: Break out ODDF from sync
> 
> These patches take the r8a7794 PFC DU support code from the BSP
> and reworks it to fit the r8a7794 ALT board. Tested with the ALT
> VGA port - by default PFC is not used however enabling PFC using
> an incremental (yet to be posted) patch works well.
> 
> It is worth noting that patch 2-4 modifies the pin groups. This
> means that the upstream DT ABI for PFC DU will differ compared
> to the unreviewed BSP code.
> 
> In general it is not considered good practice to change the pin
> groups and break compatibility since they are part of the DT ABI.
> 
> For this particular case upstream never have had PFC DU support
> for r8a7794, so treating the BSP bindings as experimental and
> migrate away seems reasonable.

If we start considering DT bindings that never went upstream as stable we'll 
have a big problem. I mean even bigger than the upstream DT bindings stability 
problem :-)

> Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>

Wouldn't it make sense to merge the 4 patches together ?

> ---
> 
>  Written against v4.4-rc1
> 
>  drivers/pinctrl/sh-pfc/pfc-r8a7794.c |  282 +++++++++++++++++++++++++++----
>  1 file changed, 252 insertions(+), 30 deletions(-)

-- 
Regards,

Laurent Pinchart

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