net: phy: national: implement 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 <ioana.ciornei@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/national.c

@@ -89,6 +89,27 @@ static int ns_ack_interrupt(struct phy_device *phydev)
 	return ret;
 }
 
+static irqreturn_t ns_handle_interrupt(struct phy_device *phydev)
+{
+	int irq_status;
+
+	irq_status = phy_read(phydev, DP83865_INT_STATUS);
+	if (irq_status < 0) {
+		phy_error(phydev);
+		return IRQ_NONE;
+	}
+
+	if (!(irq_status & DP83865_INT_MASK_DEFAULT))
+		return IRQ_NONE;
+
+	/* clear the interrupt */
+	phy_write(phydev, DP83865_INT_CLEAR, irq_status & ~0x7);
+
+	phy_trigger_machine(phydev);
+
+	return IRQ_HANDLED;
+}
+
 static void ns_giga_speed_fallback(struct phy_device *phydev, int mode)
 {
 	int bmcr = phy_read(phydev, MII_BMCR);
@@ -135,6 +156,7 @@ static struct phy_driver dp83865_driver[] = { {
 	.config_init = ns_config_init,
 	.ack_interrupt = ns_ack_interrupt,
 	.config_intr = ns_config_intr,
+	.handle_interrupt = ns_handle_interrupt,
 } };
 
 module_phy_driver(dp83865_driver);