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

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Date:	Sat, 8 Oct 2011 19:58:23 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Barry Song <Baohua.Song@....com>,
	Stephen Warren <swarren@...dia.com>,
	linus.walleij@...ricsson.com, linux-kernel@...r.kernel.org,
	workgroup.linux@....com, Rongjun Ying <rongjun.ying@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] pinmux: add a driver for the CSR SiRFprimaII pinmux

2011/9/1, Linus Walleij <linus.walleij@...aro.org>:
> 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.

 :-)  .name = "##a##"  should be changed to .name = #a

#name will convert name into a string "name"

for example,

#define PRINT( n ) printf( #n )

main()
{
    PRINT(100);
}

will output 100.

-barry
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