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

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Date:	Mon, 29 Aug 2011 14:15:38 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Barry Song <21cnbao@...il.com>
Cc:	Barry Song <Baohua.Song@....com>, linus.walleij@...ricsson.com,
	linux-kernel@...r.kernel.org, workgroup.linux@....com,
	grant.likely@...retlab.ca, Rongjun Ying <rongjun.ying@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] pinmux: add a driver for the CSR SiRFprimaII pinmux

On Mon, Aug 29, 2011 at 1:58 PM, Barry Song <21cnbao@...il.com> wrote:
>> > +static const struct sirfsoc_muxmask lcd_16bits_sirfsoc_muxmask[] = {
>> > +       {
>> > +               .group = 3,
>> > +               .mask = 0x7FFFF,
>>
>> These things look a bit magic...
>
> register seems to be magic by itself. this is register set mask of
> group 3 for LCD. group in the structure is also an offset of register
> layout.

No big deal anyway.

What some people like myself do is make #defines for most
things:

#define SIRFSOC_LCD_GROUP_OFFSET 3
#define SIRFSOC_LCD_GROUP_MASK 0x7FFFF
#define SIRFSOC_LCD_ENABLE BIT(5)

sometimes I even define shifts for masks etc.

But a comment inline explaining the magic bits is just as
fine with me.

Yours,
Linus Walleij
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