ARM: dts: rmobile: Synchronize Gen3 DTs with Linux 5.6.2

Synchronize R-Car Gen3 device trees with Linux 5.6.2,
commit 9fbe5c87eaa9b72db08425c52c373eb5f6537a0a .

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/dts/salvator-xs.dtsi b/arch/arm/dts/salvator-xs.dtsi
new file mode 100644
index 0000000..717d427
--- /dev/null
+++ b/arch/arm/dts/salvator-xs.dtsi
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree Source for the Salvator-X 2nd version board
+ *
+ * Copyright (C) 2015-2017 Renesas Electronics Corp.
+ */
+
+#include "salvator-common.dtsi"
+
+/ {
+	model = "Renesas Salvator-X 2nd version board";
+	compatible = "renesas,salvator-xs";
+};
+
+&extal_clk {
+	clock-frequency = <16640000>;
+};
+
+&i2c4 {
+	clock-frequency = <400000>;
+
+	versaclock6: clock-generator@6a {
+		compatible = "idt,5p49v6901";
+		reg = <0x6a>;
+		#clock-cells = <1>;
+		clocks = <&x23_clk>;
+		clock-names = "xin";
+	};
+};