net: phy: at803x: add QCA9561 support

Add support for the embedded fast-ethernet PHY found on the QCA9561
WiSoC platform. It supports the usual Atheros PHY featureset including
the cable tester.

Tested on a Xiaomi MiRouter 4Q (QCA9561)

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David Bauer <mail@david-bauer.net>
Link: https://lore.kernel.org/r/20211005225401.10653-1-mail@david-bauer.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/at803x.c

@@ -153,6 +153,7 @@
 #define QCA8327_A_PHY_ID			0x004dd033
 #define QCA8327_B_PHY_ID			0x004dd034
 #define QCA8337_PHY_ID				0x004dd036
+#define QCA9561_PHY_ID				0x004dd042
 #define QCA8K_PHY_ID_MASK			0xffffffff
 
 #define QCA8K_DEVFLAGS_REVISION_MASK		GENMASK(2, 0)
@@ -1237,7 +1238,8 @@ static int at803x_cable_test_get_status(struct phy_device *phydev,
 	int pair, ret;
 
 	if (phydev->phy_id == ATH9331_PHY_ID ||
-	    phydev->phy_id == ATH8032_PHY_ID)
+	    phydev->phy_id == ATH8032_PHY_ID ||
+	    phydev->phy_id == QCA9561_PHY_ID)
 		pair_mask = 0x3;
 	else
 		pair_mask = 0xf;
@@ -1277,7 +1279,8 @@ static int at803x_cable_test_start(struct phy_device *phydev)
 	phy_write(phydev, MII_BMCR, BMCR_ANENABLE);
 	phy_write(phydev, MII_ADVERTISE, ADVERTISE_CSMA);
 	if (phydev->phy_id != ATH9331_PHY_ID &&
-	    phydev->phy_id != ATH8032_PHY_ID)
+	    phydev->phy_id != ATH8032_PHY_ID &&
+	    phydev->phy_id != QCA9561_PHY_ID)
 		phy_write(phydev, MII_CTRL1000, 0);
 
 	/* we do all the (time consuming) work later */
@@ -1408,6 +1411,21 @@ static struct phy_driver at803x_driver[] = {
 	.read_status		= at803x_read_status,
 	.soft_reset		= genphy_soft_reset,
 	.config_aneg		= at803x_config_aneg,
+}, {
+	/* Qualcomm Atheros QCA9561 */
+	PHY_ID_MATCH_EXACT(QCA9561_PHY_ID),
+	.name			= "Qualcomm Atheros QCA9561 built-in PHY",
+	.suspend		= at803x_suspend,
+	.resume			= at803x_resume,
+	.flags			= PHY_POLL_CABLE_TEST,
+	/* PHY_BASIC_FEATURES */
+	.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,
+	.soft_reset		= genphy_soft_reset,
+	.config_aneg		= at803x_config_aneg,
 }, {
 	/* QCA8337 */
 	.phy_id			= QCA8337_PHY_ID,
@@ -1466,6 +1484,7 @@ static struct mdio_device_id __maybe_unused atheros_tbl[] = {
 	{ PHY_ID_MATCH_EXACT(QCA8337_PHY_ID) },
 	{ PHY_ID_MATCH_EXACT(QCA8327_A_PHY_ID) },
 	{ PHY_ID_MATCH_EXACT(QCA8327_B_PHY_ID) },
+	{ PHY_ID_MATCH_EXACT(QCA9561_PHY_ID) },
 	{ }
 };