[U-Boot] [PATCH] M28: GPIO pin validity check added

[Mike Frysinger]

On Wednesday 23 November 2011 10:08:58 Robert Deliën wrote:
> +extern int gpio_invalid(int gp);

if you really want to add this function, the Linux GPIO API uses:
	bool gpio_is_valid(int number);

but that doesn't negate the gpio_request() func from having to validate the 
pin given to it, so i don't see much point in providing this at this time ... 
no code should do something like:
	if (!gpio_is_valid())
		return error;
	if (gpio_request())
		return error;
-mike
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