[PATCH net-next v3] net: ethernet: mtk_eth_soc: avoid writing to ESW registers on MT7628

[Joris Vaisvila <joey@tinyisr.com>]

The MT7628 has a fixed-link PHY and does not expose MAC control
registers. Writes to these registers only corrupt the ESW VLAN
configuration.

This patch registers empty phylink_mac_ops for MT7628, as removing the
invalid register accesses leaves nothing to do on this SoC.

Fixes: 296c9120752b ("net: ethernet: mediatek: Add MT7628/88 SoC support")
Signed-off-by: Joris Vaisvila <joey@tinyisr.com>
---
v3: 
 - Register separate mac_ops for MT7628 instead of using early return
   based on SoC for all phylink mac operations
 - Update commit message
v2: https://lore.kernel.org/netdev/20260106052845.1945352-1-joey@tinyisr.com/
 - Add missing fixes tag
v1: https://lore.kernel.org/netdev/20251230091151.129176-1-joey@tinyisr.com/

 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 37 ++++++++++++++++++---
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 35fef28ee2f9..ede8efdc3413 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -562,9 +562,7 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode,
 	int val, ge_mode, err = 0;
 	u32 i;
 
-	/* MT76x8 has no hardware settings between for the MAC */
-	if (!MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628) &&
-	    mac->interface != state->interface) {
+	if (mac->interface != state->interface) {
 		/* Setup soc pin functions */
 		switch (state->interface) {
 		case PHY_INTERFACE_MODE_TRGMII:
@@ -956,6 +954,30 @@ static const struct phylink_mac_ops mtk_phylink_ops = {
 	.mac_enable_tx_lpi = mtk_mac_enable_tx_lpi,
 };
 
+static void rt5350_mac_config(struct phylink_config *config, unsigned int mode,
+				const struct phylink_link_state *state)
+{
+}
+
+static void rt5350_mac_link_down(struct phylink_config *config, unsigned int mode,
+				phy_interface_t interface)
+{
+}
+
+static void rt5350_mac_link_up(struct phylink_config *config,
+			    struct phy_device *phy,
+			    unsigned int mode, phy_interface_t interface,
+			    int speed, int duplex, bool tx_pause, bool rx_pause)
+{
+}
+
+/* MT76x8 (rt5350-eth) does not expose any MAC control registers */
+static const struct phylink_mac_ops rt5350_phylink_ops = {
+	.mac_config = rt5350_mac_config,
+	.mac_link_down = rt5350_mac_link_down,
+	.mac_link_up = rt5350_mac_link_up,
+};
+
 static void mtk_mdio_config(struct mtk_eth *eth)
 {
 	u32 val;
@@ -4779,6 +4801,7 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
 	int id, err;
 	int txqs = 1;
 	u32 val;
+	const struct phylink_mac_ops *mac_ops = &mtk_phylink_ops;
 
 	if (!_id) {
 		dev_err(eth->dev, "missing mac id\n");
@@ -4906,9 +4929,15 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
 			  mac->phylink_config.supported_interfaces);
 	}
 
+
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628))
+		mac_ops = &rt5350_phylink_ops;
+
 	phylink = phylink_create(&mac->phylink_config,
 				 of_fwnode_handle(mac->of_node),
-				 phy_mode, &mtk_phylink_ops);
+				 phy_mode,
+				 mac_ops);
+
 	if (IS_ERR(phylink)) {
 		err = PTR_ERR(phylink);
 		goto free_netdev;
-- 
2.52.0