ARM: dts: Add Samsung G2D DT bindings documentation

Added documentaion about G2D bindings.

Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

diff --git a/Documentation/devicetree/bindings/gpu/samsung-g2d.txt b/Documentation/devicetree/bindings/gpu/samsung-g2d.txt
new file mode 100644 (file)
index 0000000..2b14a94
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpu/samsung-g2d.txt
@@ -0,0 +1,20 @@
+* Samsung 2D Graphics Accelerator
+
+Required properties:
+  - compatible : value should be one among the following:
+       (a) "samsung,s5pv210-g2d" for G2D IP present in S5PV210 & Exynos4210 SoC
+       (b) "samsung,exynos4212-g2d" for G2D IP present in Exynos4x12 SoCs
+       (c) "samsung,exynos5250-g2d" for G2D IP present in Exynos5250 SoC
+
+  - reg : Physical base address of the IP registers and length of memory
+         mapped region.
+
+  - interrupts : G2D interrupt number to the CPU.
+
+Example:
+       g2d@12800000 {
+               compatible = "samsung,s5pv210-g2d";
+               reg = <0x12800000 0x1000>;
+               interrupts = <0 89 0>;
+               status = "disabled";
+       };