dt-bindings: tegra: Add documentation for nvidia,tegra194-pmc

The Tegra194 power management controller has one additional register
aperture to be specified in the device tree node.
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.txt

@@ -3,6 +3,7 @@ NVIDIA Tegra Power Management Controller (PMC)
 Required properties:
 - compatible: Should contain one of the following:
   - "nvidia,tegra186-pmc": for Tegra186
+  - "nvidia,tegra194-pmc": for Tegra194
 - reg: Must contain an (offset, length) pair of the register set for each
   entry in reg-names.
 - reg-names: Must include the following entries:
@@ -10,6 +11,7 @@ Required properties:
   - "wake"
   - "aotag"
   - "scratch"
+  - "misc" (Only for Tegra194)
 
 Optional properties:
 - nvidia,invert-interrupt: If present, inverts the PMU interrupt signal.