net: phy: at803x: 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.

Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Michael Walle <michael@walle.cc>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Tested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/at803x.c

@@ -628,6 +628,32 @@ static int at803x_config_intr(struct phy_device *phydev)
 	return err;
 }
 
+static irqreturn_t at803x_handle_interrupt(struct phy_device *phydev)
+{
+	int irq_status, int_enabled;
+
+	irq_status = phy_read(phydev, AT803X_INTR_STATUS);
+	if (irq_status < 0) {
+		phy_error(phydev);
+		return IRQ_NONE;
+	}
+
+	/* Read the current enabled interrupts */
+	int_enabled = phy_read(phydev, AT803X_INTR_ENABLE);
+	if (int_enabled < 0) {
+		phy_error(phydev);
+		return IRQ_NONE;
+	}
+
+	/* See if this was one of our enabled interrupts */
+	if (!(irq_status & int_enabled))
+		return IRQ_NONE;
+
+	phy_trigger_machine(phydev);
+
+	return IRQ_HANDLED;
+}
+
 static void at803x_link_change_notify(struct phy_device *phydev)
 {
 	/*
@@ -1064,6 +1090,7 @@ static struct phy_driver at803x_driver[] = {
 	.read_status		= at803x_read_status,
 	.ack_interrupt		= at803x_ack_interrupt,
 	.config_intr		= at803x_config_intr,
+	.handle_interrupt	= at803x_handle_interrupt,
 	.get_tunable		= at803x_get_tunable,
 	.set_tunable		= at803x_set_tunable,
 	.cable_test_start	= at803x_cable_test_start,
@@ -1084,6 +1111,7 @@ static struct phy_driver at803x_driver[] = {
 	/* PHY_BASIC_FEATURES */
 	.ack_interrupt		= at803x_ack_interrupt,
 	.config_intr		= at803x_config_intr,
+	.handle_interrupt	= at803x_handle_interrupt,
 }, {
 	/* Qualcomm Atheros AR8031/AR8033 */
 	PHY_ID_MATCH_EXACT(ATH8031_PHY_ID),
@@ -1102,6 +1130,7 @@ static struct phy_driver at803x_driver[] = {
 	.aneg_done		= at803x_aneg_done,
 	.ack_interrupt		= &at803x_ack_interrupt,
 	.config_intr		= &at803x_config_intr,
+	.handle_interrupt	= at803x_handle_interrupt,
 	.get_tunable		= at803x_get_tunable,
 	.set_tunable		= at803x_set_tunable,
 	.cable_test_start	= at803x_cable_test_start,
@@ -1122,6 +1151,7 @@ static struct phy_driver at803x_driver[] = {
 	/* PHY_BASIC_FEATURES */
 	.ack_interrupt		= at803x_ack_interrupt,
 	.config_intr		= at803x_config_intr,
+	.handle_interrupt	= at803x_handle_interrupt,
 	.cable_test_start	= at803x_cable_test_start,
 	.cable_test_get_status	= at803x_cable_test_get_status,
 }, {
@@ -1134,6 +1164,7 @@ static struct phy_driver at803x_driver[] = {
 	/* PHY_BASIC_FEATURES */
 	.ack_interrupt		= &at803x_ack_interrupt,
 	.config_intr		= &at803x_config_intr,
+	.handle_interrupt	= at803x_handle_interrupt,
 	.cable_test_start	= at803x_cable_test_start,
 	.cable_test_get_status	= at803x_cable_test_get_status,
 	.read_status		= at803x_read_status,