Documentation: dt-bindings: add exynos-chipid binding information

Exynos SoC's DT files are using Chipid device nodes, but it's binding
information is missing. This patch adds exynos-chipid binding information.

Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-chipid.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-chipid.txt
new file mode 100644 (file)
index 0000000..85c5dfd
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/samsung/exynos-chipid.txt
@@ -0,0 +1,12 @@
+SAMSUNG Exynos SoCs Chipid driver.
+
+Required properties:
+- compatible : Should at least contain "samsung,exynos4210-chipid".
+
+- reg: offset and length of the register set
+
+Example:
+       chipid@10000000 {
+               compatible = "samsung,exynos4210-chipid";
+               reg = <0x10000000 0x100>;
+       };