linux-kernel - Re: [PATCH v2 3/6] spi: sh-msiof: Add support for R-Car H2 and M2

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Date:	Thu, 27 Feb 2014 09:39:54 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Mark Brown <broonie@...nel.org>,
	Takashi Yoshii <takasi-y@....dti.ne.jp>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-spi <linux-spi@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 3/6] spi: sh-msiof: Add support for R-Car H2 and M2

On Wed, Feb 26, 2014 at 11:16 PM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>> diff --git a/Documentation/devicetree/bindings/spi/sh-msiof.txt
>> b/Documentation/devicetree/bindings/spi/sh-msiof.txt index
>> eae3c8c9300e..1f0cb33763a1 100644
>> --- a/Documentation/devicetree/bindings/spi/sh-msiof.txt
>> +++ b/Documentation/devicetree/bindings/spi/sh-msiof.txt
>> @@ -1,8 +1,13 @@
>>  Renesas MSIOF spi controller
>>
>>  Required properties:
>> -- compatible           : "renesas,sh-msiof" for SuperH, or
>> +- compatible           : "renesas,msiof-<soctype>" for SoCs,
>> +                      "renesas,sh-msiof" for SuperH, or
>>                        "renesas,sh-mobile-msiof" for SH Mobile series.
>> +                      Examples with soctypes are:
>> +                      "renesas,msiof-sh7724" (SH)
>
> Given that the driver doesn't handle the "renesas,msiof-sh7724" compatible
> string this might not be a good example. Furthermore SuperH doesn't have DT
> support. I would thus drop the "renesas,sh-msiof" compatible string from patch
> 1/6 and wouldn't mention sh7724 here. I very much doubt that someone would
> have developed DT support for SuperH on the side and shipped products that
> would be broken by this change :-)

Upon reading your comment again: do you suggest to also remove the plain
"renesas,sh-msiof"? That one was present before, since DT support was added
to the driver in

commit cf9c86efecf9510e62388fd174cf607671c59fa3
Author: Bastian Hecht <hechtb@...il.com>
Date:   Wed Dec 12 12:54:48 2012 +0100

    spi/sh-msiof: Add device tree parsing to driver

    This adds the capability to retrieve setup data from the device tree
    node. The usage of platform data is still available.

    Signed-off-by: Bastian Hecht <hechtb+renesas@...il.com>
    Signed-off-by: Grant Likely <grant.likely@...retlab.ca>

So I prefer not to remove any pre-existing compatible values.
Do you agree?

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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
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