dt-bindings: devfreq: rk3399_dmc: Add rockchip,pmu phandle

The Rockchip DMC (Dynamic Memory Interface) needs to access to the PMU
general register files to know the DRAM type, so add a phandle to the
syscon that manages these registers.

Signed-off-by: Enric Balletbo i Serra <[email protected]>
Reviewed-by: Chanwoo Choi <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Gaël PORTAY <[email protected]>
Acked-by: MyungJoo Ham <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>

Author: Enric Balletbo i Serra

Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt

@@ -18,6 +18,8 @@ Optional properties:
 			 format depends on the interrupt controller.
 			 It should be a DCF interrupt. When DDR DVFS finishes
 			 a DCF interrupt is triggered.
+- rockchip,pmu:		 Phandle to the syscon managing the "PMU general register
+			 files".
 
 Following properties relate to DDR timing: