net/at91_ether: use gpio_is_valid for phy IRQ line
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 <nicolas.ferre@atmel.com> Acked-by:
Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Acked-by:
David S. Miller <davem@davemloft.net>
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