ARM: dts: msm: Add GMU CX GenPD instance

Currently, there is a race condition in GenPD framework where
GPU CX GDSC can remain ON if both GMU and KGSL SMMU devices are
suspending in parallel and are voting on the same power domain.
Use a dedicated power domain for CX GDSC voting as per latest
recommendation.

Change-Id: Iffeb9a7f24a5e3c31a425e57b021f87f8f94c7fb
Signed-off-by: Kamal Agrawal <quic_kamaagra@quicinc.com>

bindings/adreno.txt

@@ -80,8 +80,9 @@ Power Domains:
 - power-domains:		List of PM domain specifiers that reference each power-domain
 				used by the GPU
 - power-domain-names:		List of names that represent each of the specifiers in the
-				'power-domains' property. Includes 'gpu_cx' and 'gpu_gx' which
-				represent the power-domains for CX and GX GDSC, respectively.
+				'power-domains' property. Includes 'cx', 'gx' and 'gmu_cx'
+				which represent the power-domains for CX GDSC, GX GDSC and
+				GMU CX GDSC respectively.
 
 IOMMU Data:
 - iommu:			Phandle for the KGSL IOMMU device node

gpu/sun-gpu.dtsi

@@ -173,8 +173,9 @@
 		interrupt-names = "hfi", "gmu";
 
 		power-domains = <&gpucc GPU_CC_CX_GDSC>,
+				<&gpucc GPU_CC_CX_GMU_GDSC>,
 				<&gxclkctl GX_CLKCTL_GX_GDSC>;
-		power-domain-names = "cx", "gx";
+		power-domain-names = "cx", "gmu_cx", "gx";
 
 		clocks = <&gpucc GPU_CC_CX_GMU_CLK>,
 			<&gpucc GPU_CC_CXO_CLK>,