[PATCH v4 2/3] dt-bindings: add document of Rockchip power domain

["jinkun.hong" <jinkun.hong@rock-chips.com>]

From: "jinkun.hong" <jinkun.hong@rock-chips.com>

Signed-off-by: Jack Dai <jack.dai@rock-chips.com>
Signed-off-by: jinkun.hong <jinkun.hong@rock-chips.com>

---

Changes in v4: None
Changes in v3:
- DT structure has changed

Changes in v2:
- move clocks to "optional"

 .../bindings/arm/rockchip/power_domain.txt         |   46 ++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/rockchip/power_domain.txt

diff --git a/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt b/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt
new file mode 100644
index 0000000..f8357b3
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt
@@ -0,0 +1,46 @@
+* Rockchip Power Domains
+
+Rockchip processors include support for multiple power domains which can be
+powered up/down by software based on different application scenes to save power.
+
+Required properties for power domain controller:
+- compatible: should be one of the following.
+    * rockchip,rk3288-power-gpu - for rk3288 type gpu power domain.
+    * rockchip,rk3288-power-hevc - for rk3288 type hevc power domain.
+    * rockchip,rk3288-power-video - for rk3288 type video power domain.
+    * rockchip,rk3288-power-vio - for rk3288 type vio power domain.
+- rockchip,pmu: phandle referencing a syscon providing the pmu registers
+- #power-domain-cells: Number of cells in a power-domain specifier.
+		       should be 0.
+
+Example:
+
+	gpu_power: gpu-power-controller {
+		compatible = "rockchip,rk3288-power-gpu";
+		rockchip,pmu = <&pmu>;
+		#power-domain-cells = <0>;
+	};
+
+	hevc_power: hevc-power-controller {
+		compatible = "rockchip,rk3288-power-hevc";
+		rockchip,pmu = <&pmu>;
+		#power-domain-cells = <0>;
+	};
+
+	video_power: video-power-controller {
+		compatible = "rockchip,rk3288-power-video";
+		rockchip,pmu = <&pmu>;
+		#power-domain-cells = <0>;
+	};
+
+	vio_power: vio-power-controller {
+		compatible = "rockchip,rk3288-power-vio";
+		rockchip,pmu = <&pmu>;
+		#power-domain-cells = <0>;
+	};
+
+	gpu: gpu@0xffa30000 {
+		...
+		power-domains = <&gpu_power>;
+		...
+	};
-- 
1.7.9.5