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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Cc: Simon Horman <horms@verge.net.au>,
	Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
	linux-renesas-soc@vger.kernel.org,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	"open list:DRM DRIVERS FOR RENESAS"
	<dri-devel@lists.freedesktop.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] drm: rcar-du: Add r8a77980 support
Date: Fri, 13 Dec 2019 02:48:12 +0200	[thread overview]
Message-ID: <20191213004812.GA27328@pendragon.ideasonboard.com> (raw)
In-Reply-To: <2eeacacc-f190-4ba8-32bc-b4103b41db46@ideasonboard.com>

Hi Kieran,

On Mon, Dec 09, 2019 at 12:41:07PM +0000, Kieran Bingham wrote:
> On 13/09/2019 10:03, Laurent Pinchart wrote:
> > On Fri, Sep 13, 2019 at 10:21:29AM +0200, Simon Horman wrote:
> >> On Thu, Sep 12, 2019 at 01:00:41PM +0300, Sergei Shtylyov wrote:
> >>> On 11.09.2019 22:25, Kieran Bingham wrote:
> >>>
> >>>> Add direct support for the r8a77980 (V3H).
> >>>>
> >>>> The V3H shares a common, compatible configuration with the r8a77970
> >>>> (V3M) so that device info structure is reused.
> >>>
> >>>    Do we really need to add yet another compatible in this case?
> >>> I just added r8a77970 to the compatible prop in the r8a77980 DT. That's why
> >>> a patch like this one didn't get posted by me.
> >>
> >> The reason for having per-SoC compat strings is that the IP blocks
> >> are not versioned and while we can observe that there are similarities
> >> between, f.e. the DU on the r8a77970 and r8a77980, we can't be certain that
> >> differences may not emerge at some point. By having per-SoC compat strings
> >> we have the flexibility for the driver to address any such differences as
> >> the need arises.
> >>
> >> My recollection is that this scheme has been adopted for non-versioned
> >> Renesas IP blocks since June 2015 and uses of this scheme well before that.
> > 
> > Sure, but we could use
> > 
> > 	compatible = "renesas,du-r8a77980", "renesas,du-r8a77970";
> > 
> > in DT without updating the driver. If the r8a77980 turns out to be
> > different, we'll then update the driver without a need to modify DT. I'm
> > fine either way, so
> > 
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> Thanks,
> 
> This patch has an RB tag from you, and Simon, but alas I don't believe
> it has been picked up in your drm/du/next branch.
> 
> Is this patch acceptable? Or do I need to repost?

Could you just confirm I should apply this patch, and not go for the
alternative proposal above ?

> >>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> >>
> >> Reviewed-by: Simon Horman <horms+renesas@verge.net.au>

-- 
Regards,

Laurent Pinchart

  reply	other threads:[~2019-12-13  0:48 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11 19:25 Kieran Bingham
2019-09-12 10:00 ` Sergei Shtylyov
2019-09-12 10:26   ` Kieran Bingham
2019-09-12 10:45     ` Kieran Bingham
2019-09-12 12:03     ` Geert Uytterhoeven
2019-09-12 12:11       ` Kieran Bingham
2019-09-13  8:21   ` Simon Horman
2019-09-13  8:30     ` Geert Uytterhoeven
2019-09-13  8:57       ` Simon Horman
2019-09-13  9:03     ` Laurent Pinchart
2019-12-09 12:41       ` Kieran Bingham
2019-12-13  0:48         ` Laurent Pinchart [this message]
2019-12-16  9:47           ` Kieran Bingham
2019-12-16 10:37             ` Geert Uytterhoeven
2019-12-17 23:11               ` Laurent Pinchart

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