On Wed, 2009-10-28 at 21:53 +0200, Andrew Victor wrote:
> hi,
>
> > Then I think it would be best to use GPIO_PIN_NONE. Makes it clear
> > what is expected and avoids confusion on what should be the proper
> > value.
> > I hope I'm not saying non-sense, but even if I am, I guess you can see
> > that I'm advocating against the magic numbers :)
>
> What magic numbers ?
I think Thiago was referring to the "-1" in the original patch as the
magic number.
Leaving the field blank to be initialised to 0 is certainly the
cleanest, I agree, but it doesn't actually /work/. On many archs 0 is a
valid gpio number; the gpio_is_valid check used throughout the kernel
(including atmel-mci.c) looks like
static inline int gpio_is_valid(int number)
{
/* only some non-negative numbers are valid */
return ((unsigned)number) < ARCH_NR_GPIOS;
}
--Ben.
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