arm64: dts: rockchip: Add Edgeble NCM6A-IO 2.5G ETH

Edgeble NCM6A-IO board has 2.5Gbps Ethernet via PCI2_0.

Add support for it.
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20231125190522.87607-7-jagan@edgeble.aiSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588-edgeble-neu6a-io.dtsi

@@ -3,16 +3,31 @@
  * Copyright (c) 2023 Edgeble AI Technologies Pvt. Ltd.
  */
 
+#include <dt-bindings/gpio/gpio.h>
+
 / {
 	chosen {
 		stdout-path = "serial2:1500000n8";
 	};
+
+	vcc3v3_pcie2x1l0: vcc3v3-pcie2x1l0-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc3v3_pcie2x1l0";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		startup-delay-us = <5000>;
+		vin-supply = <&vcc_3v3_s3>;
+	};
 };
 
 &combphy0_ps {
 	status = "okay";
 };
 
+&combphy1_ps {
+	status = "okay";
+};
+
 &i2c6 {
 	status = "okay";
 
@@ -29,7 +44,22 @@ hym8563: rtc@51 {
 	};
 };
 
+/* ETH */
+&pcie2x1l0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie2_0_rst>;
+	reset-gpios = <&gpio4 RK_PA5 GPIO_ACTIVE_HIGH>; /* PCIE20_1_PERST_L */
+	vpcie3v3-supply = <&vcc3v3_pcie2x1l0>;
+	status = "okay";
+};
+
 &pinctrl {
+	pcie2 {
+		pcie2_0_rst: pcie2-0-rst {
+			rockchip,pins = <4 RK_PA5 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	hym8563 {
 		hym8563_int: hym8563-int {
 			rockchip,pins = <0 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;