ARM: dts: Add CM5 DTS support

The CM5 is a platform that will appear in multiple boards, each of
which may have different connectivity. Split the CM5 DTS into a common
cm5.dtsi and board-specific dts files, where the CM5 DTS file (the one
loaded by the firmware by default) is an alias for the CM5IO DTS file.

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

arch/arm/boot/dts/broadcom/bcm2712-rpi-cm5-cm4io.dts

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "bcm2712-rpi-cm5.dtsi"
+
+i2c_csi_dsi: &i2c_csi_dsi0 { }; // An alias for compatibility
+
+// The RP1 USB3 interfaces are not usable on CM4IO
+
+&rp1_usb0 {
+	status = "disabled";
+};
+
+&rp1_usb1 {
+	status = "disabled";
+};
+
+/ {
+	__overrides__ {
+		i2c_csi_dsi = <&i2c_csi_dsi>, "status";
+	};
+};

arch/arm/boot/dts/broadcom/bcm2712-rpi-cm5-cm5io.dts

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "bcm2712-rpi-cm5.dtsi"
+
+i2c_csi_dsi: &i2c_csi_dsi0 { }; // An alias for compatibility
+
+/ {
+	__overrides__ {
+		i2c_csi_dsi = <&i2c_csi_dsi>, "status";
+	};
+};