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

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Date:   Tue, 6 Nov 2018 10:07:56 +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 Mon, Nov 05, 2018 at 06:19:22PM +0100, Geert Uytterhoeven wrote:
> Hi Jacopo,
>
> 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.

Thanks
  j
>
> > 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/

Thanks
   j

> 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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