arm64: dts: exynos: gs101: add cmu_dpu and sysreg_dpu dt nodes

Enable the cmu_dpu clock management unit. It feeds some of the display
IPs. Additionally add the sysreg_dpu node which contains the
BUSCOMPONENT_DRCG_EN and MEMCLK registers required by cmu_dpu to enable
dynamic root clock gating of bus components.

Reviewed-by: André Draszik <andre.draszik@linaro.org>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Link: https://patch.msgid.link/20260113-dpu-clocks-v3-5-cb85424f2c72@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Author: petegriffin

arch/arm64/boot/dts/exynos/google/gs101.dtsi

@@ -1815,6 +1815,23 @@
 			status = "disabled";
 		};
 
+		cmu_dpu: clock-controller@1c000000 {
+			compatible = "google,gs101-cmu-dpu";
+			reg = <0x1c000000 0x10000>;
+			#clock-cells = <1>;
+
+			clocks = <&ext_24_5m>,
+				 <&cmu_top CLK_DOUT_CMU_DPU_BUS>;
+			clock-names = "oscclk", "bus";
+			samsung,sysreg = <&sysreg_dpu>;
+		};
+
+		sysreg_dpu: syscon@1c020000 {
+			compatible = "google,gs101-dpu-sysreg", "syscon";
+			reg = <0x1c020000 0x10000>;
+			clocks = <&cmu_dpu CLK_GOUT_DPU_SYSREG_DPU_PCLK>;
+		};
+
 		cmu_top: clock-controller@1e080000 {
 			compatible = "google,gs101-cmu-top";
 			reg = <0x1e080000 0x10000>;