arm: dts: ls1028a: add an empty /soc

To keep the device tree similar to the linux kernel one, we need to move
all CCSR related devices into the /soc node. To keep the patches easy to
review, we initially add an empty /soc node and populate it piece by
piece.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/arm/dts/fsl-ls1028a-kontron-sl28-u-boot.dtsi b/arch/arm/dts/fsl-ls1028a-kontron-sl28-u-boot.dtsi
index a501cec..0b1afe3 100644
--- a/arch/arm/dts/fsl-ls1028a-kontron-sl28-u-boot.dtsi
+++ b/arch/arm/dts/fsl-ls1028a-kontron-sl28-u-boot.dtsi
@@ -297,6 +297,10 @@
 	u-boot,dm-pre-reloc;
 };
 
+&soc {
+	u-boot,dm-pre-reloc;
+};
+
 &sysclk {
 	u-boot,dm-pre-reloc;
 };
diff --git a/arch/arm/dts/fsl-ls1028a.dtsi b/arch/arm/dts/fsl-ls1028a.dtsi
index 48f70c1..1f562cf 100644
--- a/arch/arm/dts/fsl-ls1028a.dtsi
+++ b/arch/arm/dts/fsl-ls1028a.dtsi
@@ -478,4 +478,11 @@
 		compatible = "arm,sp805-wdt";
 		reg = <0x0 0xc000000 0x0 0x1000>;
 	};
+
+	soc: soc {
+		compatible = "simple-bus";
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+	};
 };