linux-kernel - Re: [PATCH v2] pinmux: add a driver for the CSR SiRFprimaII pinmux

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Date:	Thu, 1 Sep 2011 13:12:07 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Barry Song <Baohua.Song@....com>
Cc:	linus.walleij@...ricsson.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, workgroup.linux@....com,
	Rongjun Ying <rongjun.ying@....com>,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH v2] pinmux: add a driver for the CSR SiRFprimaII pinmux

On Thu, Sep 1, 2011 at 4:22 AM, Barry Song <Baohua.Song@....com> wrote:

>  -v2:
>  rebase to Linus W's v5 patch(v5 is still in discussion);
>  add complete pinmux list table;
>  add gpio ranges;
>  replace mask magic number by bitops;
>  rename upmx to spmx

No further comments on this, but now I went in and rewrote
pinmuxing a bit so that pin groups are a separate concept from
pinmux (which just refers to a group). Please have a look at
the U300 driver and see if you can accomodate the changes.

Sorry for the flow of respins but I'm really liking the stuff that
has come out as a result of Stephen's feedback. Having
separate groups and functions may look a bit crufty on
simple pinmuxes but I'm pretty convinced it'll be a win
for the subsystem when moving to more complex drivers.

> +static const struct sirfsoc_pinmux_func sirfsoc_pinmux_funcs[] = {
> +       {
> +               .name = "lcd_16bits",
> +               .pins = lcd_16bits_pins,
> +               .num_pins = ARRAY_SIZE(lcd_16bits_pins),
> +               .padmux = &lcd_16bits_padmux,
> +       }, {
> +               .name = "lcd_18bits",
> +               .pins = lcd_18bits_pins,
> +               .num_pins = ARRAY_SIZE(lcd_18bits_pins),
> +               .padmux = &lcd_18bits_padmux,
> +       }, {

You can probably simplify this and other things with
preprocessor macros if you want to, like:

#define SIRF_FUNC_ENTRY(a) \
{ .name = "##a##", .pins = ##a##_pins, .num_pins =
ARRAY_SIZE(##a##_pins), .padmux = &##a##_padmux }

Then just:

static const struct sirfsoc_pinmux_func sirfsoc_pinmux_funcs[] = {
    SIRF_FUNC_ENTRY(lcd_16bits),

The macro syntax is probably wrong, the preprocessor always
craze me out, but you get the idea.

Thanks,
Linus Walleij
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