Re: [PATCH] pinmux: add a driver for the CSR SiRFprimaII pinmux
From: Linus Walleij
Date: Mon Aug 29 2011 - 08:15:45 EST
On Mon, Aug 29, 2011 at 1:58 PM, Barry Song <21cnbao@xxxxxxxxx> 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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