ARM: dts: aspeed: Add Romulus BMC platform

Romulus is an OpenPower machine with an ast2500 BMC. It has NCSI
networking and 512MB of RAM.
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/Makefile

@@ -981,6 +981,7 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += \
 	mt8135-evbp1.dtb
 dtb-$(CONFIG_ARCH_ZX) += zx296702-ad1.dtb
 dtb-$(CONFIG_ARCH_ASPEED) += aspeed-bmc-opp-palmetto.dtb \
+	aspeed-bmc-opp-romulus.dtb \
 	aspeed-ast2500-evb.dtb
 endif
 

arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts

+/dts-v1/;
+
+#include "aspeed-g5.dtsi"
+
+/ {
+	model = "Romulus BMC";
+	compatible = "ibm,romulus-bmc", "aspeed,ast2500";
+
+	aliases {
+		serial4 = &uart5;
+	};
+
+	chosen {
+		stdout-path = &uart5;
+		bootargs = "console=ttyS4,115200 earlyprintk";
+	};
+
+	memory {
+		reg = <0x80000000 0x40000000>;
+	};
+
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		vga_memory: framebuffer@bf000000 {
+			no-map;
+			reg = <0xbf000000 0x01000000>; /* 16M */
+		};
+	};
+};
+
+&uart5 {
+	status = "okay";
+};
+
+&mac0 {
+	status = "okay";
+
+	use-ncsi;
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_rmii1_default>;
+};