From: Nicolas Ferre <redacted>
Date: Thu, 24 Nov 2011 22:21:14 +0100

Use the generic gpiolib gpio_is_valid() function to test
if the phy IRQ line GPIO is actually provided.

For non-connected or non-existing phy IRQ lines, -EINVAL
value is used for phy_irq_pin field of struct at91_eth_data.

Signed-off-by: Nicolas Ferre <redacted>

I'm assuming this goes through the ARM tree, because in both of my networking
trees there is no ARM at91 implementation of gpio_is_valid().