linux-kernel - Re: [PATCH 07/10] spi: sh-msiof: Add support for R-Car H2 and M2

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Message-ID: <CANqRtoT6G6mxce=cN05mNNtYCcyCvMPzpHQ7RyzPE8XfkFjMyQ@mail.gmail.com>
Date:	Mon, 24 Feb 2014 17:09:15 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Mark Brown <broonie@...nel.org>,
	Takashi Yoshii <takasi-y@....dti.ne.jp>,
	linux-spi <linux-spi@...r.kernel.org>,
	SH-Linux <linux-sh@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 07/10] spi: sh-msiof: Add support for R-Car H2 and M2

Hi Geert,

On Mon, Feb 24, 2014 at 4:39 PM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> Hi Magnus,
>
> On Mon, Feb 24, 2014 at 3:45 AM, Magnus Damm <magnus.damm@...il.com> wrote:
>> On Fri, Feb 21, 2014 at 1:13 AM, Geert Uytterhoeven
>> <geert@...ux-m68k.org> wrote:
>>> On Thu, Feb 20, 2014 at 4:41 PM, Magnus Damm <magnus.damm@...il.com> wrote:
>>>> On thing stuck out a bit with the bindings. I can see that you specify
>>>> both fifo size and use the SoC suffix for the r8a7790 and r8a7791
>>>> bindings. Isn't that a bit of redundant information there, if we know
>>>> that the SoC is r8a7790 or r8a7791 then can't we simply put that
>>>> information in r8a779x_data above and perhaps keep the binding
>>>> simpler? Perhaps same thing applies to other properties as well?
>>>
>>> "renesas,tx-fifo-size" and "renesas,rx-fifo-size" are part of the existing
>>> bindings, so I'm a bit reluctant to change these.
>>> Hmm, since the original bindings didn't specify the default values,
>>> I could make them chip-specific, though.
>>
>> Thanks, yes I think treating the "renesas,tx-fifo-size" and
>> "renesas,rx-fifo-size" bindings as optional and allow us to rely on
>> chip-specific default values makes sense.
>>
>>> The only other property is "num-cs", which can have any value if you
>>> start using the generic "cs-gpios".
>>
>> I see. It looks to me that such a setting is board-specific, so what
>> is a sane default in the SoC DTSI? You seem to have it set to "1"
>> today, but if the board is supposed to override it anyway then do we
>> need to set it?
>>
>> Anyway, "num-cs" is a minor detail so no need to bother about that too much!
>
> In v2, I'll drop the "num-cs" from the dtsi, so it will default to the driver's
> default (which is 1, for the simple case of using hardware controlled CS).

Sounds good, thanks for your help!

/ magnus
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