arm64: dts: agilex: Add initial support for Intel's Agilex SoCFPGA

Add the initial device tree files for Intel's Agilex SoCFPGA platform.
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm64/Kconfig.platforms

@@ -7,6 +7,11 @@ config ARCH_ACTIONS
 	help
 	  This enables support for the Actions Semiconductor S900 SoC family.
 
+config ARCH_AGILEX
+	bool "Intel's Agilex SoCFPGA Family"
+	help
+	  This enables support for Intel's Agilex SoCFPGA Family.
+
 config ARCH_SUNXI
 	bool "Allwinner sunxi 64-bit SoC Family"
 	select ARCH_HAS_RESET_CONTROLLER

arch/arm64/boot/dts/Makefile

@@ -13,6 +13,7 @@ subdir-y += cavium
 subdir-y += exynos
 subdir-y += freescale
 subdir-y += hisilicon
+subdir-y += intel
 subdir-y += lg
 subdir-y += marvell
 subdir-y += mediatek

arch/arm64/boot/dts/intel/Makefile

+dtb-$(CONFIG_ARCH_AGILEX) += socfpga_agilex_socdk.dtb

arch/arm64/boot/dts/intel/socfpga_agilex_socdk.dts

+// SPDX-License-Identifier:     GPL-2.0
+/*
+ * Copyright (C) 2019, Intel Corporation
+ */
+#include "socfpga_agilex.dtsi"
+
+/ {
+	model = "SoCFPGA Agilex SoCDK";
+
+	aliases {
+		serial0 = &uart0;
+		ethernet0 = &gmac0;
+		ethernet1 = &gmac1;
+		ethernet2 = &gmac2;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory {
+		device_type = "memory";
+		/* We expect the bootloader to fill in the reg */
+		reg = <0 0 0 0>;
+	};
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&gmac0 {
+	status = "okay";
+	phy-mode = "rgmii";
+	phy-handle = <&phy0>;
+
+	max-frame-size = <9000>;
+
+	mdio0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "snps,dwmac-mdio";
+		phy0: ethernet-phy@0 {
+			reg = <4>;
+
+			txd0-skew-ps = <0>; /* -420ps */
+			txd1-skew-ps = <0>; /* -420ps */
+			txd2-skew-ps = <0>; /* -420ps */
+			txd3-skew-ps = <0>; /* -420ps */
+			rxd0-skew-ps = <420>; /* 0ps */
+			rxd1-skew-ps = <420>; /* 0ps */
+			rxd2-skew-ps = <420>; /* 0ps */
+			rxd3-skew-ps = <420>; /* 0ps */
+			txen-skew-ps = <0>; /* -420ps */
+			txc-skew-ps = <900>; /* 0ps */
+			rxdv-skew-ps = <420>; /* 0ps */
+			rxc-skew-ps = <1680>; /* 780ps */
+		};
+	};
+};
+
+&mmc {
+	status = "okay";
+	cap-sd-highspeed;
+	broken-cd;
+	bus-width = <4>;
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&watchdog0 {
+	status = "okay";
+};