linux-kernel - Re: [PATCH 04/15] pinctrl: sh-pfc: Initial R-Car M3-N support

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Date:   Wed, 14 Feb 2018 15:25:36 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     jacopo mondi <jacopo@...ndi.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-arm-kernel@...ts.infradead.org,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/15] pinctrl: sh-pfc: Initial R-Car M3-N support

Hi Jacopo,

On Wed, Feb 14, 2018 at 2:53 PM, jacopo mondi <jacopo@...ndi.org> wrote:
> On Wed, Feb 14, 2018 at 02:37:08PM +0100, Geert Uytterhoeven wrote:
>> On Tue, Feb 13, 2018 at 10:45 AM, Jacopo Mondi
>> <jacopo+renesas@...ndi.org> wrote:
>> > Add initial PFC support for R-Car M3-N (r8a77965) SoC.
>> > No groups or functions defined, just pin and registers enumeration.
>> >
>> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
>>
>> Thanks for your patch!
>>
>> Looks mostly OK to me.
>> You do want to compare with pfc-r8a7796.c: all differences not related to
>> SATA_DEVSL, FSCLK, DU_DOTCLKIN2/3, and PRESET are issues that were fixed
>> recently in pfc-r8a7796.c, and should apply to pfc-r8a77965.c, too.
>>
>
> I have used the M3-W tables with the exception of the pins/groups you
> mentioned, that are clearly marked as different in the datasheet. At
> least, this was my intention :)
>
> I used v4.15 M3-W PFC tables, should I look in v4.16-rc1 or in
> renesas-drivers for updates?

Always look at the latest version in my sh-pfc branch ;-)

>> That leaves us with very few differences only, but it won't be trivial to have
>> a combined M3-W/N PFC driver, I'm afraid.
>
> Takes a certain degree of grep-foo to clearly highlight differences
> between the two version. Do you have any script/tools you use to
> compare PFC tables a bit more easily?

The "--no-index" option of git diff allows to compare files against each
other, instead of against some other version.
Can be combined with wdiff:

$ git help wdiff
`git wdiff' is aliased to `diff --color-words'

soc-dts-diff (https://www.spinics.net/lists/linux-renesas-soc/msg22630.html)
also helps, even for drivers.

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