Re: [PATCH] pio: add arch specific gpio_is_valid() function

[Alan Cox]

> Adding:
> 
> 	 device->output_pin = -EINVAL;

gpio numbers are unsigned in the rest of the API

It's unfortunate that 0 was used for a GPIO - I take it this is too late
to get fixed as we had to fix IRQ numbering and the like ?
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