ramips: fix SDXC function for mt76x8 one eth port devices

There are only 5 devices in mt76x8 sub-target selected the MTK SDXC
driver package. And they are all single ethernet port routers or dev
boards:

* LinkIt Smart 7688
* Onion Omega2+
* RAVPower RP-WD009
* VoCore VoCore2
* VoCore VoCore2-Lite

For these devices, they are using the ephy p1 - p4 as the SDXC IO
pins. Therefore, these GPIO pads must be configured in "digital"
IO mode.

Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/17446
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit f5996ae947)

target/linux/ramips/dts/mt7628an_mediatek_linkit-smart-7688.dts

@@ -168,8 +168,27 @@
 	nvmem-cell-names = "mac-address";
 };
 
+&pinctrl {
+	ephy-digital;
+
+	sdxc_iot_mode: sdxc_iot_mode {
+		esd {
+			groups = "esd";
+			function = "iot";
+		};
+
+		sdxc {
+			groups = "sdmode";
+			function = "sdxc";
+		};
+	};
+};
+
 &sdhci {
 	status = "okay";
+
+	pinctrl-0 = <&sdxc_iot_mode>;
+	pinctrl-1 = <&sdxc_iot_mode>;
 	cd-inverted;
 };
 

target/linux/ramips/dts/mt7628an_onion_omega2.dtsi

@@ -170,8 +170,27 @@
 	nvmem-cell-names = "mac-address";
 };
 
+&pinctrl {
+	ephy-digital;
+
+	sdxc_iot_mode: sdxc_iot_mode {
+		esd {
+			groups = "esd";
+			function = "iot";
+		};
+
+		sdxc {
+			groups = "sdmode";
+			function = "sdxc";
+		};
+	};
+};
+
 &sdhci {
 	status = "okay";
+
+	pinctrl-0 = <&sdxc_iot_mode>;
+	pinctrl-1 = <&sdxc_iot_mode>;
 };
 
 &wmac {

target/linux/ramips/dts/mt7628an_ravpower_rp-wd009.dts

@@ -84,6 +84,22 @@
 	};
 };
 
+&pinctrl {
+	ephy-digital;
+
+	sdxc_iot_mode: sdxc_iot_mode {
+		esd {
+			groups = "esd";
+			function = "iot";
+		};
+
+		sdxc {
+			groups = "sdmode";
+			function = "sdxc";
+		};
+	};
+};
+
 &state_default {
 	gpio {
 		groups = "uart1", "wled_an", "p0led_an", "p2led_an", "p3led_an",
@@ -94,6 +110,9 @@
 
 &sdhci {
 	status = "okay";
+
+	pinctrl-0 = <&sdxc_iot_mode>;
+	pinctrl-1 = <&sdxc_iot_mode>;
 };
 
 &i2c {

target/linux/ramips/dts/mt7628an_vocore_vocore2.dtsi

@@ -68,6 +68,22 @@
 	};
 };
 
+&pinctrl {
+	ephy-digital;
+
+	sdxc_iot_mode: sdxc_iot_mode {
+		esd {
+			groups = "esd";
+			function = "iot";
+		};
+
+		sdxc {
+			groups = "sdmode";
+			function = "sdxc";
+		};
+	};
+};
+
 &state_default {
 	gpio {
 		groups = "wled_an", "refclk", "wdt";
@@ -75,6 +91,13 @@
 	};
 };
 
+&sdhci {
+	status = "okay";
+
+	pinctrl-0 = <&sdxc_iot_mode>;
+	pinctrl-1 = <&sdxc_iot_mode>;
+};
+
 &wmac {
 	status = "okay";