[U-Boot] [PATCH v2 2/9] sunxi: initial sun7i pinmux and gpio support

[Ian Campbell]

On Mon, 2014-03-24 at 21:54 +0100, Marek Vasut wrote:

> > +int sunxi_gpio_set_cfgpin(u32 pin, u32 val);
> > +int sunxi_gpio_get_cfgpin(u32 pin);
> > +int sunxi_gpio_set_drv(u32 pin, u32 val);
> > +int sunxi_gpio_set_pull(u32 pin, u32 val);
> > +int name_to_gpio(const char *name);
> > +#define name_to_gpio name_to_gpio
> 
> What is this ugly define doing here ?

common/cmd_gpio.c uses the #ifndef name_to_gpio pattern to provide (or
not) a default fallback implementation. I think this is a reasonably
(but not very) common idiom for such cases where the non-default variant
is not best expressed as a macro.

Ian.