[PATCH net-next] net: phy: mediatek: do not match MT7530 PHY if 10/100 only

[Caleb James DeLisle <cjd@cjdns.fr>]

An EcoNet SoC 10/100 PHY uses the same ID as the MT7530 PHY, but a true
MT7530 PHY always has gigabit support so they can be distinguished by
the presence of the ESTATUS_1000_TFULL flag. Add a match_phy_device
which refuses to match if the PHY is not gigabit.

Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
This supercedes [PATCH v6 net-next] net: phy: mediatek: support MT7530 PHYs on EN71221 MCM
Link: https://lore.kernel.org/netdev/20260917130534.297930-1-cjd@cjdns.fr
Because after the recent EEE disablement in the driver, it is found
that the default MT7530 PHY driver does apparently work with the EcoNet
MCM MT7530.
---
 drivers/net/phy/mediatek/mtk-ge.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/phy/mediatek/mtk-ge.c b/drivers/net/phy/mediatek/mtk-ge.c
index 96d8ac5154e5..f801966bb4ee 100644
--- a/drivers/net/phy/mediatek/mtk-ge.c
+++ b/drivers/net/phy/mediatek/mtk-ge.c
@@ -101,6 +101,18 @@ static int mt7530_phy_config_init(struct phy_device *phydev)
 	return 0;
 }
 
+/*
+ * MTK_GPHY_ID_MT7530 ID is also used for an EcoNet SoC FE phy, but that PHY
+ * does not advertise ESTATUS_1000_TFULL. Match this driver only if the PHY
+ * advertizes gigabit capability.
+ */
+static int mt753x_gphy_match(struct phy_device *phydev,
+			     const struct phy_driver *phydrv)
+{
+	return genphy_match_phy_device(phydev, phydrv) &&
+	       (phy_read(phydev, MII_ESTATUS) & ESTATUS_1000_TFULL) != 0;
+}
+
 static int mt7531_phy_config_init(struct phy_device *phydev)
 {
 	mtk_gephy_config_init(phydev);
@@ -135,6 +147,7 @@ static struct phy_driver mtk_gephy_driver[] = {
 		 */
 		.config_intr	= genphy_no_config_intr,
 		.handle_interrupt = genphy_handle_interrupt_no_ack,
+		.match_phy_device = mt753x_gphy_match,
 		.suspend	= genphy_suspend,
 		.resume		= genphy_resume,
 		.read_page	= mtk_phy_read_page,
-- 
2.39.5