From mboxrd@z Thu Jan  1 00:00:00 1970
From: Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH v2 6/6] devicetree: bindings: Document Renesas JPEG
 Processing Unit.
Date: Tue, 26 Aug 2014 10:03:34 +0200
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To: Simon Horman <horms@verge.net.au>
Cc: Mikhail Ulyanov <mikhail.ulyanov@cogentembedded.com>, Magnus Damm <magnus.damm@gmail.com>, Mauro Carvalho Chehab <m.chehab@samsung.com>, Rob Herring <robh+dt@kernel.org>, Grant Likely <grant.likely@linaro.org>, Mark Rutland <mark.rutland@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Hans Verkuil <hans.verkuil@cisco.com>, Linux-sh list <linux-sh@vger.kernel.org>, Linux Media Mailing List <linux-media@vger.kernel.org>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
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On Tue, Aug 26, 2014 at 1:57 AM, Simon Horman <horms@verge.net.au> wrote:
> On Mon, Aug 25, 2014 at 02:59:46PM +0200, Geert Uytterhoeven wrote:
>> Hi Mikhail,
>>
>> On Mon, Aug 25, 2014 at 2:35 PM, Mikhail Ulyanov
>> <mikhail.ulyanov@cogentembedded.com> wrote:
>> > +  - compatible: should containg one of the following:
>> > +                       - "renesas,jpu-r8a7790" for R-Car H2
>> > +                       - "renesas,jpu-r8a7791" for R-Car M2
>> > +                       - "renesas,jpu-gen2" for R-Car second generation
>>
>> Isn't "renesas,jpu-gen2" meant as a fallback?
>>
>> I.e. the DTS should have one of '7790 and '7791, AND the gen2 fallback,
>> so we can make the driver match against '7790 and '7791 is we find
>> out about an incompatibility.
>
> Is there a document that clearly states that there is such a thing
> as jpu-gen2 in hardware? If not I would prefer not to add a binding for it.

We do have a document that describes the "JPEG Processing Unit (JPU)",
as found in the following members of the "Second Generation R-Car Series
Products": "R-Car H2", "R-Car M2-W", "R-Car M2-N", and "R-Car V2H".

As for other SoCs, M1, H1, and A1 also seem to contain a JPU, but just
like Mikhail, I don't have enough information to say anything about those.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds