linux-kernel - Re: [PATCH 0/2] pinctrl: sh-pfc: r8a77965: Add VIN4 and VIN5

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Date:   Tue, 6 Nov 2018 10:31:21 +0100
From:   jacopo mondi <jacopo@...ndi.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Simon Horman <horms@...ge.net.au>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] pinctrl: sh-pfc: r8a77965: Add VIN4 and VIN5

Hi Geert,

On Tue, Nov 06, 2018 at 10:24:30AM +0100, Geert Uytterhoeven wrote:
> Hi Jacopo,
>
> On Tue, Nov 6, 2018 at 10:08 AM jacopo mondi <jacopo@...ndi.org> wrote:
> > On Mon, Nov 05, 2018 at 06:19:22PM +0100, Geert Uytterhoeven wrote:
> > > On Mon, Oct 29, 2018 at 7:14 PM Jacopo Mondi <jacopo+renesas@...ndi.org> wrote:
> > > >    this two patches add supports for VIN4 and VIN5 interfaces to R-Car M3-N.
> > > >
> > > > On this SoC (and in the forthcoming support for E3 R8A77990) the VIN groups
> > > > could appear on different sets of pins, usually the 'a' and 'b' one.
> > > >
> > > > With the existing VIN_DATA_PIN_GROUP macro we have to specify group names as:
> > > >
> > > > VIN_DATA_PIN_GROUP(vin4_data_a, 8)
> > > >
> > > > which results in the group being named as "vin4_data_a_8" which is
> > > > un-consistent with the canonical group names (eg. "vin4_data8_a").
> > > >
> > > > This series adds a macro that allows to specify the group 'version' along with
> > > > the pin and mux numbers in patch [1/1]. I haven't been able to find a better
> > > > term than 'version' as 'group' was already taken. Suggestions welcome.
> > >
> > > Yeah, the datasheet also calls these groups :-(
> > > A possible alternative is to use "variant"?
> > >
> > > Or, what about avoiding the name issue by making the VIN_DATA_PIN_GROUP()
> > > macro varargs, and passing the "variant" as the (optional) third parameter?
> > > That way existing users work as a before, while you can also write e.g.
> > >
> > >     VIN_DATA_PIN_GROUP_VER(vin4_data, 8, _a),
> >
> > Indeed.
> >
> > Would something along the following lines fly for you?
> >
> > #define VIN_DATA_PIN_GROUP(n, s, ...)                                   \
> >         {                                                               \
> >                 .name = #n#s#__VA_ARGS__,                               \
> >                 .pins = n##__VA_ARGS__##_pins.data##s,                  \
> >                 .mux = n##__VA_ARGS__##_mux.data##s,                    \
> >                 .nr_pins = ARRAY_SIZE(n##__VA_ARGS__##_pins.data##s),   \
> >         }
> >
> > It can be used as:
> > VIN_DATA_PIN_GROUP(vin4_data, 8, _a),
> > VIN_DATA_PIN_GROUP(vin5_data, 8),
> >
> > With your ack on this, I'll send v2.
>
> Thank you, that is exactly what I had in mind.
>
> > > > As I cannot test VIN4 nor VIN5 on Salvator-XS as the parallel pins are not
> > > > wired, I made sure the macro creates correct names and fields not only by
> > > > compile testing it, but with a small C program [1] that replicates the VIN data
> > > > layout defined in the PFC module and access fields (and has helped me testing
> > > > more easily the preprocessor stringification/concatenation process).
> > > >
> > > > Final note: Simon, you took the E3 patches in your tree, and I expect them to
> > > > land on v4.20-rc1. They use the old macros, are follow up patches ok?)
> > >
> > > Which patches are using these macro names, and are in v4.20-rc1?
> > >
> > > BTW, "grep vin._data_[a-z][0-9] drivers/pinctrl/sh-pfc/*o" tells me we already
> > > have broken groups names on r8a7792, r8a7795, and r8a7796.
> > > Fortunately we have no known users of them, so they can be fixed.
> > >
> >
> > On v4.20-rc1 the grep returns none for me :/
> > git grep v4.20-rc1 "vin._data_[a-z][0-9]" drivers/pinctrl/sh-pfc/
>
> I grepped the .o files, to make sure it would see the final strings, which
> obviously works in the build tree only ;-)

Ah yes, stupid me.

>
> For the source tree, please try:
>
>     git grep -w VIN_DATA_PIN_GROUP.*_[a-z] v4.20-rc1

Argh, there are quite a few of them, but fortunately no users so far.

Is it ok fixing them in v2 of this series with follow-up patches, or
would you like a single patch that introduces the variadic macro and
replaces all the occurrences in the per-SoC PFC modules in one go?

>
> 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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