ramips: mt7620: move mt7620_mdio_mode() to ethernet driver

The function mt7620_mdio_mode is only called once
and both the function and mdio_mode block have been named incorrectly,
leading to confusion and useless commits.

These lines in the mdio_mode block of mt7620_hw_init
are only intended for boards with an external mt7530 switch.
(see commit 194ca6127ee18cd3a95da4d03f02e43b5428c0bb)

Therefore, move lines from mdio_mode to the place in soc_mt7620.c
where the type of mt7530 switch is identified,
and move lines from mt7620_mdio_mode to a main function.

mt7620_mdio_mode was called from mt7620_gsw_init
where the priv struct is available,
so the lines must stay in mt7620_gsw_init function.

In order to keep things as simple as possible,
keep the DTS property related function calls together,
by moving them from mt7620_gsw_probe to init.

Remove the now useless DTS properties and extra phy nodes.

Fixes: 5a6229a93df8 ("ramips: remove superfluous & confusing DT binding")
Fixes: b85fe43ec8c4 ("ramips: mt7620: add force use of mdio-mode")
Signed-off-by: Michael Pratt <mcpratt@pm.me>
(cherry picked from commit 6972e498d33ec896c676b7af91e3bfb00aa846a1)

5 files changed, 38 insertions, 74 deletions

diff --git a/target/linux/ramips/dts/mt7620a_edimax_ew-747x.dtsi b/target/linux/ramips/dts/mt7620a_edimax_ew-747x.dtsi
index 5cb8451547..6060fd99a6 100644
--- a/target/linux/ramips/dts/mt7620a_edimax_ew-747x.dtsi
+++ b/target/linux/ramips/dts/mt7620a_edimax_ew-747x.dtsi
@@ -155,8 +155,6 @@
 
 	mtd-mac-address = <&factory 0x4>;
 
-	mediatek,mdio-mode = <1>;
-
 	phy-reset-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
 	phy-reset-duration = <30>;
 
diff --git a/target/linux/ramips/dts/mt7620a_engenius_esr600.dts b/target/linux/ramips/dts/mt7620a_engenius_esr600.dts
index 2f0f9b256e..ea895ac6ea 100644
--- a/target/linux/ramips/dts/mt7620a_engenius_esr600.dts
+++ b/target/linux/ramips/dts/mt7620a_engenius_esr600.dts
@@ -144,7 +144,6 @@
 
 	mdio-bus {
 		status = "okay";
-		mediatek,mdio-mode;
 
 		ethernet-phy@0 {
 			reg = <0>;
diff --git a/target/linux/ramips/dts/mt7620a_lava_lr-25g001.dts b/target/linux/ramips/dts/mt7620a_lava_lr-25g001.dts
index ee845c7b5e..41d69d009b 100644
--- a/target/linux/ramips/dts/mt7620a_lava_lr-25g001.dts
+++ b/target/linux/ramips/dts/mt7620a_lava_lr-25g001.dts
@@ -115,9 +115,8 @@
 
 	mdio-bus {
 		status = "okay";
-		mediatek,mdio-mode = <1>;
 
-		phy0: ethernet-phy@0 {
+		ethernet-phy@0 {
 			reg = <0>;
 			phy-mode = "rgmii";
 			qca,ar8327-initvals = <
@@ -127,26 +126,6 @@
 				0x94 0x00000000 /* PORT6_STATUS */
 			>;
 		};
-
-		phy1: ethernet-phy@1 {
-			reg = <1>;
-			phy-mode = "rgmii";
-		};
-
-		phy2: ethernet-phy@2 {
-			reg = <2>;
-			phy-mode = "rgmii";
-		};
-
-		phy3: ethernet-phy@3 {
-			reg = <3>;
-			phy-mode = "rgmii";
-		};
-
-		phy4: ethernet-phy@4 {
-			reg = <4>;
-			phy-mode = "rgmii";
-		};
 	};
 };
 
diff --git a/target/linux/ramips/files/drivers/net/ethernet/ralink/gsw_mt7620.c b/target/linux/ramips/files/drivers/net/ethernet/ralink/gsw_mt7620.c
index 54b8b204eb..67f70f286d 100644
--- a/target/linux/ramips/files/drivers/net/ethernet/ralink/gsw_mt7620.c
+++ b/target/linux/ramips/files/drivers/net/ethernet/ralink/gsw_mt7620.c
@@ -61,31 +61,7 @@ static irqreturn_t gsw_interrupt_mt7620(int irq, void *_priv)
 	return IRQ_HANDLED;
 }
 
-static int mt7620_mdio_mode(struct device_node *eth_node)
-{
-	struct device_node *phy_node, *mdiobus_node;
-	const __be32 *id;
-	int ret = 0;
-
-	mdiobus_node = of_get_child_by_name(eth_node, "mdio-bus");
-
-	if (mdiobus_node) {
-		if (of_property_read_bool(mdiobus_node, "mediatek,mdio-mode"))
-			ret = 1;
-
-		for_each_child_of_node(mdiobus_node, phy_node) {
-			id = of_get_property(phy_node, "reg", NULL);
-			if (id && (be32_to_cpu(*id) == 0x1f))
-				ret = 1;
-		}
-
-		of_node_put(mdiobus_node);
-	}
-
-	return ret;
-}
-
-static void mt7620_hw_init(struct mt7620_gsw *gsw, int mdio_mode)
+static void mt7620_hw_init(struct mt7620_gsw *gsw)
 {
 	u32 i;
 	u32 val;
@@ -97,20 +73,6 @@ static void mt7620_hw_init(struct mt7620_gsw *gsw, int mdio_mode)
 	/* Enable MIB stats */
 	mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_MIB_CNT_EN) | (1 << 1), GSW_REG_MIB_CNT_EN);
 
-	if (mdio_mode) {
-		/* set MT7530 central align */
-		val = mt7530_mdio_r32(gsw, 0x7830);
-		val &= ~BIT(0);
-		val |= BIT(1);
-		mt7530_mdio_w32(gsw, 0x7830, val);
-
-		val = mt7530_mdio_r32(gsw, 0x7a40);
-		val &= ~BIT(30);
-		mt7530_mdio_w32(gsw, 0x7a40, val);
-
-		mt7530_mdio_w32(gsw, 0x7a78, 0x855);
-	}
-
 	if (gsw->ephy_base) {
 		mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_GPC1) |
 			(gsw->ephy_base << 16),
@@ -215,9 +177,13 @@ MODULE_DEVICE_TABLE(of, mediatek_gsw_match);
 
 int mtk_gsw_init(struct fe_priv *priv)
 {
+	struct device_node *eth_node = priv->dev->of_node;
+	struct device_node *phy_node, *mdiobus_node;
 	struct device_node *np = priv->switch_np;
 	struct platform_device *pdev = of_find_device_by_node(np);
 	struct mt7620_gsw *gsw;
+	const __be32 *id;
+	u8 val;
 
 	if (!pdev)
 		return -ENODEV;
@@ -228,7 +194,23 @@ int mtk_gsw_init(struct fe_priv *priv)
 	gsw = platform_get_drvdata(pdev);
 	priv->soc->swpriv = gsw;
 
-	mt7620_hw_init(gsw, mt7620_mdio_mode(priv->dev->of_node));
+	mdiobus_node = of_get_child_by_name(eth_node, "mdio-bus");
+	if (mdiobus_node) {
+		for_each_child_of_node(mdiobus_node, phy_node) {
+			id = of_get_property(phy_node, "reg", NULL);
+			if (id && (be32_to_cpu(*id) == 0x1f))
+				of_node_put(mdiobus_node);
+		}
+	}
+
+	gsw->port4_ephy = !of_property_read_bool(np, "mediatek,port4-gmac");
+
+	if (of_property_read_u8(np, "mediatek,ephy-base", &val) == 0)
+		gsw->ephy_base = val;
+	else
+		gsw->ephy_base = 0;
+
+	mt7620_hw_init(gsw);
 
 	if (gsw->irq) {
 		request_irq(gsw->irq, gsw_interrupt_mt7620, 0,
@@ -243,8 +225,6 @@ static int mt7620_gsw_probe(struct platform_device *pdev)
 {
 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct mt7620_gsw *gsw;
-	struct device_node *np = pdev->dev.of_node;
-	u8 val;
 
 	gsw = devm_kzalloc(&pdev->dev, sizeof(struct mt7620_gsw), GFP_KERNEL);
 	if (!gsw)
@@ -256,13 +236,6 @@ static int mt7620_gsw_probe(struct platform_device *pdev)
 
 	gsw->dev = &pdev->dev;
 
-	gsw->port4_ephy = !of_property_read_bool(np, "mediatek,port4-gmac");
-
-	if (of_property_read_u8(np, "mediatek,ephy-base", &val) == 0)
-		gsw->ephy_base = val;
-	else
-		gsw->ephy_base = 0;
-
 	gsw->irq = platform_get_irq(pdev, 0);
 
 	platform_set_drvdata(pdev, gsw);
diff --git a/target/linux/ramips/files/drivers/net/ethernet/ralink/soc_mt7620.c b/target/linux/ramips/files/drivers/net/ethernet/ralink/soc_mt7620.c
index 49aa4da507..d06e9da586 100644
--- a/target/linux/ramips/files/drivers/net/ethernet/ralink/soc_mt7620.c
+++ b/target/linux/ramips/files/drivers/net/ethernet/ralink/soc_mt7620.c
@@ -82,11 +82,26 @@ static const u16 mt7620_reg_table[FE_REG_COUNT] = {
 static int mt7620_gsw_config(struct fe_priv *priv)
 {
 	struct mt7620_gsw *gsw = (struct mt7620_gsw *) priv->soc->swpriv;
+	u32 val;
 
 	/* is the mt7530 internal or external */
 	if (priv->mii_bus && mdiobus_get_phy(priv->mii_bus, 0x1f)) {
 		mt7530_probe(priv->dev, gsw->base, NULL, 0);
 		mt7530_probe(priv->dev, NULL, priv->mii_bus, 1);
+
+		/* magic values from original SDK */
+		val = mt7530_mdio_r32(gsw, 0x7830);
+		val &= ~BIT(0);
+		val |= BIT(1);
+		mt7530_mdio_w32(gsw, 0x7830, val);
+
+		val = mt7530_mdio_r32(gsw, 0x7a40);
+		val &= ~BIT(30);
+		mt7530_mdio_w32(gsw, 0x7a40, val);
+
+		mt7530_mdio_w32(gsw, 0x7a78, 0x855);
+
+		pr_info("mt7530: mdio central align\n");
 	} else {
 		mt7530_probe(priv->dev, gsw->base, NULL, 1);
 	}