diff --git a/arch/arm/dts/uniphier-ph1-ld4-ref.dts b/arch/arm/dts/uniphier-ph1-ld4-ref.dts
index d7b0007..6cae452 100644
--- a/arch/arm/dts/uniphier-ph1-ld4-ref.dts
+++ b/arch/arm/dts/uniphier-ph1-ld4-ref.dts
@@ -9,6 +9,7 @@
 /dts-v1/;
 /include/ "uniphier-ph1-ld4.dtsi"
 /include/ "uniphier-ref-daughter.dtsi"
+/include/ "uniphier-support-card.dtsi"
 
 / {
 	model = "UniPhier PH1-LD4 Reference Board";
@@ -35,6 +36,10 @@
 	};
 };
 
+&ethsc {
+	interrupts = <0 49 4>;
+};
+
 &serial0 {
 	status = "okay";
 };
diff --git a/arch/arm/dts/uniphier-ph1-ld6b-ref.dts b/arch/arm/dts/uniphier-ph1-ld6b-ref.dts
index 13a29fd..e2a2a8c 100644
--- a/arch/arm/dts/uniphier-ph1-ld6b-ref.dts
+++ b/arch/arm/dts/uniphier-ph1-ld6b-ref.dts
@@ -9,6 +9,7 @@
 /dts-v1/;
 /include/ "uniphier-ph1-ld6b.dtsi"
 /include/ "uniphier-ref-daughter.dtsi"
+/include/ "uniphier-support-card.dtsi"
 
 / {
 	model = "UniPhier PH1-LD6b Reference Board";
@@ -37,6 +38,10 @@
 	};
 };
 
+&ethsc {
+	interrupts = <0 52 4>;
+};
+
 &serial0 {
 	status = "okay";
 };
diff --git a/arch/arm/dts/uniphier-ph1-pro4-ref.dts b/arch/arm/dts/uniphier-ph1-pro4-ref.dts
index 07a9783..5be76e2 100644
--- a/arch/arm/dts/uniphier-ph1-pro4-ref.dts
+++ b/arch/arm/dts/uniphier-ph1-pro4-ref.dts
@@ -9,6 +9,7 @@
 /dts-v1/;
 /include/ "uniphier-ph1-pro4.dtsi"
 /include/ "uniphier-ref-daughter.dtsi"
+/include/ "uniphier-support-card.dtsi"
 
 / {
 	model = "UniPhier PH1-Pro4 Reference Board";
@@ -38,6 +39,10 @@
 	};
 };
 
+&ethsc {
+	interrupts = <0 50 4>;
+};
+
 &serial0 {
 	status = "okay";
 };
diff --git a/arch/arm/dts/uniphier-ph1-sld3-ref.dts b/arch/arm/dts/uniphier-ph1-sld3-ref.dts
index c7213c9..c4601cf 100644
--- a/arch/arm/dts/uniphier-ph1-sld3-ref.dts
+++ b/arch/arm/dts/uniphier-ph1-sld3-ref.dts
@@ -9,6 +9,7 @@
 /dts-v1/;
 /include/ "uniphier-ph1-sld3.dtsi"
 /include/ "uniphier-ref-daughter.dtsi"
+/include/ "uniphier-support-card.dtsi"
 
 / {
 	model = "UniPhier PH1-sLD3 Reference Board";
@@ -36,6 +37,10 @@
 	};
 };
 
+&ethsc {
+	interrupts = <0 49 4>;
+};
+
 &serial0 {
 	status = "okay";
 };
diff --git a/arch/arm/dts/uniphier-ph1-sld8-ref.dts b/arch/arm/dts/uniphier-ph1-sld8-ref.dts
index ec5c5bd..8ceb93e 100644
--- a/arch/arm/dts/uniphier-ph1-sld8-ref.dts
+++ b/arch/arm/dts/uniphier-ph1-sld8-ref.dts
@@ -9,6 +9,7 @@
 /dts-v1/;
 /include/ "uniphier-ph1-sld8.dtsi"
 /include/ "uniphier-ref-daughter.dtsi"
+/include/ "uniphier-support-card.dtsi"
 
 / {
 	model = "UniPhier PH1-sLD8 Reference Board";
@@ -35,6 +36,10 @@
 	};
 };
 
+&ethsc {
+	interrupts = <0 48 4>;
+};
+
 &serial0 {
 	status = "okay";
 };
diff --git a/arch/arm/dts/uniphier-support-card.dtsi b/arch/arm/dts/uniphier-support-card.dtsi
new file mode 100644
index 0000000..be0f1d6
--- /dev/null
+++ b/arch/arm/dts/uniphier-support-card.dtsi
@@ -0,0 +1,33 @@
+/*
+ * Device Tree Source for UniPhier Support Card (Expansion Board)
+ *
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	X11
+ */
+
+&system_bus {
+	status = "okay";
+	ranges = <1 0x00000000 0x42000000 0x02000000>;
+
+	support_card: support_card {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x00000000 1 0x01f00000 0x00100000>;
+
+		ethsc: ethernet@00000000 {
+			compatible = "smsc,lan9118", "smsc,lan9115";
+			reg = <0x00000000 0x1000>;
+			phy-mode = "mii";
+			reg-io-width = <4>;
+		};
+
+		serialsc: uart@000b0000 {
+			compatible = "ns16550a";
+			reg = <0x000b0000 0x20>;
+			clock-frequency = <12288000>;
+			reg-shift = <1>;
+		};
+	};
+};