linux-kernel - Re: [PATCH 11/15] gpio: rcar: Add R-Car M3-N compatible string

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Date:   Tue, 20 Feb 2018 14:40:50 +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 11/15] gpio: rcar: Add R-Car M3-N compatible string

Hi Jacopo,

On Tue, Feb 20, 2018 at 2:35 PM, jacopo mondi <jacopo@...ndi.org> wrote:
> On Wed, Feb 14, 2018 at 03:05:05PM +0100, Geert Uytterhoeven wrote:
>> On Tue, Feb 13, 2018 at 10:45 AM, Jacopo Mondi
>> <jacopo+renesas@...ndi.org> wrote:
>> > Add compatible string for R-Car M3-N (r8a77965) in gpio-rcar.
>> >
>> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
>>
>> > --- a/drivers/gpio/gpio-rcar.c
>> > +++ b/drivers/gpio/gpio-rcar.c
>> > @@ -360,6 +360,10 @@ static const struct of_device_id gpio_rcar_of_table[] = {
>> >                 /* Gen3 GPIO is identical to Gen2. */
>> >                 .data = &gpio_rcar_info_gen2,
>> >         }, {
>> > +               .compatible = "renesas,gpio-r8a77965",
>> > +               /* Gen3 GPIO is identical to Gen2. */
>> > +               .data = &gpio_rcar_info_gen2,
>> > +       }, {
>>
>> This part is not needed, as the driver already matches agains the generic
>> "renesas,rcar-gen3-gpio".
>
> Just to point out that the compatible string is there for M3-W and H3.
> Anyway, if that's not good practice to add per-SoC strings here, I'll
> drop this bit.

That's correct. Initially, we added the H3 string first, and the M3-W later.
After that we learned about new future Gen3 members, and we started using
the family-specific one.

Note that we cannot drop the strings for H3 and M3-W from the driver, as
old DTBs do not have the family-specific strings.

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