[PATCH 2/3] drm/exynos: add dt-binding documentation for rotator

[Chanho Park]

This patch adds a dt-binding document for exynos rotator. It describes which
nodes should be defined to use the rotator.

Signed-off-by: Chanho Park <chanho61.park at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
 .../bindings/drm/exynos/samsung-rotator.txt        |   35 ++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/drm/exynos/samsung-rotator.txt

diff --git a/Documentation/devicetree/bindings/drm/exynos/samsung-rotator.txt b/Documentation/devicetree/bindings/drm/exynos/samsung-rotator.txt
new file mode 100644
index 0000000..6b1d704
--- /dev/null
+++ b/Documentation/devicetree/bindings/drm/exynos/samsung-rotator.txt
@@ -0,0 +1,35 @@
+* Samsung Image Rotator
+
+Required properties:
+  - compatible : value should be the "samsung,exynos4210".
+  - reg : Physical base address of the IP registers and length of memory
+	  mapped region.
+  - interrupts : interrupt number to the CPU.
+  - clocks : clock number of exynos4 rotator clock.
+  - clocks : clock name of rotator
+  - status : "okay" or "disabled"
+  - limit table for image formats : min_w/min_h/max_w/max_h for min/max of image
+
+Example:
+	rotator: rotator at 12810000 {
+		compatible = "samsung,exynos4210-rotator";
+		reg = <0x12810000 0x1000>;
+		interrupts = <0 83 0>;
+		clocks = <&clock 278>;
+		clock-names = "rotator";
+		status = "disabled";
+		ycbcr420_2p {
+			min_w = <32>;
+			min_h = <32>;
+			max_w = <32768>;
+			max_h = <32768>;
+			align = <3>;
+		};
+		rgb888 {
+			min_w = <8>;
+			min_h = <8>;
+			max_w = <8192>;
+			max_h = <8192>;
+			align = <2>;
+		};
+	};
-- 
1.7.9.5