net: phy: add callback for custom interrupt handler to struct phy_driver

The phylib interrupt handler handles link change events only currently.
However PHY drivers may want to use other interrupt sources too,
e.g. to report temperature monitoring events. Therefore add a callback
to struct phy_driver allowing PHY drivers to implement a custom
interrupt handler.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Suggested-by: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy.c

@@ -772,8 +772,13 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 	if (phydev->drv->did_interrupt && !phydev->drv->did_interrupt(phydev))
 		return IRQ_NONE;
 
-	/* reschedule state queue work to run as soon as possible */
-	phy_trigger_machine(phydev);
+	if (phydev->drv->handle_interrupt) {
+		if (phydev->drv->handle_interrupt(phydev))
+			goto phy_err;
+	} else {
+		/* reschedule state queue work to run as soon as possible */
+		phy_trigger_machine(phydev);
+	}
 
 	if (phy_clear_interrupt(phydev))
 		goto phy_err;

include/linux/phy.h

@@ -537,6 +537,9 @@ struct phy_driver {
 	 */
 	int (*did_interrupt)(struct phy_device *phydev);
 
+	/* Override default interrupt handling */
+	int (*handle_interrupt)(struct phy_device *phydev);
+
 	/* Clears up any memory if needed */
 	void (*remove)(struct phy_device *phydev);