ARM: dts: Add support for pcb8385

Add basic support for pcb8385 [1]. It is a modular board which allows
to add different daughter cards on which there are different PHYs.
This adds support for UART, LEDs and I2C.

[1] https://www.microchip.com/en-us/development-tool/ev83e85a

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Link: https://lore.kernel.org/r/20251208083545.3642168-3-horatiu.vultur@microchip.com
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

Author: HoratiuVultur

arch/arm/boot/dts/microchip/Makefile

@@ -102,4 +102,5 @@ dtb-$(CONFIG_SOC_LAN966) += \
 	lan966x-kontron-kswitch-d10-mmt-8g.dtb \
 	lan966x-pcb8290.dtb \
 	lan966x-pcb8291.dtb \
-	lan966x-pcb8309.dtb
+	lan966x-pcb8309.dtb \
+	lan966x-pcb8385.dtb

arch/arm/boot/dts/microchip/lan966x-pcb8385.dts

@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * lan966x-pcb8385.dts - Device Tree file for PCB8385
+ */
+/dts-v1/;
+
+#include "lan966x.dtsi"
+#include "dt-bindings/phy/phy-lan966x-serdes.h"
+
+/ {
+	model = "Microchip EVB - LAN9668";
+	compatible = "microchip,lan9668-pcb8385", "microchip,lan9668", "microchip,lan966";
+
+	aliases {
+		serial0 = &usart3;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	gpio-restart {
+		compatible = "gpio-restart";
+		gpios = <&gpio 59 GPIO_ACTIVE_LOW>;
+		open-source;
+		priority = <200>;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-p1-green {
+			label = "cu0:green";
+			gpios = <&sgpio_out 2 0 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+
+		led-p1-yellow {
+			label = "cu0:yellow";
+			gpios = <&sgpio_out 2 1 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+
+		led-p2-green {
+			label = "cu1:green";
+			gpios = <&sgpio_out 3 0 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+
+		led-p2-yellow {
+			label = "cu1:yellow";
+			gpios = <&sgpio_out 3 1 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+	};
+};
+
+&aes {
+	status = "reserved"; /* Reserved by secure OS */
+};
+
+&flx0 {
+	atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_TWI>;
+	status = "okay";
+};
+
+&flx3 {
+	atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_USART>;
+	status = "okay";
+};
+
+&gpio {
+	fc0_b_pins: fc0-b-pins {
+		/* SCL, SDA */
+		pins = "GPIO_25", "GPIO_26";
+		function = "fc0_b";
+	};
+
+	fc3_b_pins: fc3-b-pins {
+		/* RX, TX */
+		pins = "GPIO_52", "GPIO_53";
+		function = "fc3_b";
+	};
+
+	sgpio_a_pins: sgpio-a-pins {
+		/* SCK, D0, D1, LD */
+		pins = "GPIO_32", "GPIO_33", "GPIO_34", "GPIO_35";
+		function = "sgpio_a";
+	};
+};
+
+&i2c0 {
+	pinctrl-0 = <&fc0_b_pins>;
+	pinctrl-names = "default";
+	dmas = <0>, <0>;
+	i2c-analog-filter;
+	i2c-digital-filter;
+	i2c-digital-filter-width-ns = <35>;
+	i2c-sda-hold-time-ns = <1500>;
+	status = "okay";
+
+	eeprom@54 {
+		compatible = "atmel,24c01";
+		reg = <0x54>;
+	};
+
+	eeprom@55 {
+		compatible = "atmel,24c01";
+		reg = <0x55>;
+	};
+};
+
+&sgpio {
+	pinctrl-0 = <&sgpio_a_pins>;
+	pinctrl-names = "default";
+	microchip,sgpio-port-ranges = <0 3>;
+	status = "okay";
+
+	gpio@0 {
+		ngpios = <64>;
+	};
+	gpio@1 {
+		ngpios = <64>;
+	};
+};
+
+&usart3 {
+	pinctrl-0 = <&fc3_b_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+};