ar71xx: implement callback in mdio reset

This enables us to add fixups to the board specific code for boards that
require special treatment of PHYs on mdio bus reset.

Signed-off-by: Felix Kaechele <heffer@fedoraproject.org>
http://patchwork.openwrt.org/patch/4614/
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39127

target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h

@@ -55,6 +55,8 @@ struct ag71xx_mdio_platform_data {
 	u8		is_ar934x:1;
 	unsigned long	mdio_clock;
 	unsigned long	ref_clock;
+
+	void		(*reset)(struct mii_bus *bus);
 };
 
 #endif /* __ASM_MACH_ATH79_PLATFORM_H */

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_mdio.c

@@ -181,6 +181,9 @@ static int ag71xx_mdio_reset(struct mii_bus *bus)
 	ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t);
 	udelay(100);
 
+	if (am->pdata->reset)
+		am->pdata->reset(bus);
+
 	return 0;
 }