net: phy: cicada: implement the generic .handle_interrupt() callback

In an attempt to actually support shared IRQs in phylib, we now move the
responsibility of triggering the phylib state machine or just returning
IRQ_NONE, based on the IRQ status register, to the PHY driver. Having
3 different IRQ handling callbacks (.handle_interrupt(),
.did_interrupt() and .ack_interrupt() ) is confusing so let the PHY
driver implement directly an IRQ handler like any other device driver.
Make this driver follow the new convention.

Signed-off-by: Ioana Ciornei <[e-mail]>
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/phy/cicada.c

···
 	return err;
 }
 
+static irqreturn_t cis820x_handle_interrupt(struct phy_device *phydev)
+{
+	int irq_status;
+
+	irq_status = phy_read(phydev, MII_CIS8201_ISTAT);
+	if (irq_status < 0) {
+		phy_error(phydev);
+		return IRQ_NONE;
+	}
+
+	if (!(irq_status & MII_CIS8201_IMASK_MASK))
+		return IRQ_NONE;
+
+	phy_trigger_machine(phydev);
+
+	return IRQ_HANDLED;
+}
+
 /* Cicada 8201, a.k.a Vitesse VSC8201 */
 static struct phy_driver cis820x_driver[] = {
 {
···
 	.config_init	= &cis820x_config_init,
 	.ack_interrupt	= &cis820x_ack_interrupt,
 	.config_intr	= &cis820x_config_intr,
+	.handle_interrupt = &cis820x_handle_interrupt,
 }, {
 	.phy_id		= 0x000fc440,
 	.name		= "Cicada Cis8204",
···
 	.config_init	= &cis820x_config_init,
 	.ack_interrupt	= &cis820x_ack_interrupt,
 	.config_intr	= &cis820x_config_intr,
+	.handle_interrupt = &cis820x_handle_interrupt,
 } };
 
 module_phy_driver(cis820x_driver);