[PATCH v2] phy/at8031: enable at8031 to work on interrupt mode

[David Miller]

From: Zhao Qiang <B45475 at freescale.com>
Date: Fri, 28 Mar 2014 15:39:41 +0800

> The at8031 can work on polling mode and interrupt mode.
> Add ack_interrupt and config intr funcs to enable
> interrupt mode for it.
> 
> Signed-off-by: Zhao Qiang <B45475 at freescale.com>
> ---
> changes for v2:
> 	- when interrupt is not enabled, write 0 to interrupt enbale register
> 	- delete a inner parens not needed

Applied to net-next, thanks.