[media] exynos5-is: Add DT binding documentation

The patch adds the DT binding doc for exynos5 SoC camera
subsystem.

Change-Id: Iaec580ca240554989f243a618989599195f7b5f5
Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com>
Signed-off-by: Arun Kumar K <arun.kk@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

1 files changed, 126 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/media/exynos5250-camera.txt b/Documentation/devicetree/bindings/media/exynos5250-camera.txt
new file mode 100644
index 00000000000..09420ba0869
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+++ b/Documentation/devicetree/bindings/media/exynos5250-camera.txt
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+Samsung EXYNOS5 SoC Camera Subsystem
+------------------------------------
+
+The Exynos5 SoC Camera subsystem comprises of multiple sub-devices
+represented by separate device tree nodes. Currently this includes: FIMC-LITE,
+MIPI CSIS and FIMC-IS.
+
+The sub-device nodes are referenced using phandles in the common 'camera' node
+which also includes common properties of the whole subsystem not really
+specific to any single sub-device, like common camera port pins or the common
+camera bus clocks.
+
+Common 'camera' node
+--------------------
+
+Required properties:
+
+- compatible		: must be "samsung,exynos5250-fimc"
+- clocks		: list of clock specifiers, corresponding to entries in
+                          the clock-names property
+- clock-names		: must contain "sclk_bayer" entry
+- samsung,csis		: list of phandles to the mipi-csis device nodes
+- samsung,fimc-lite	: list of phandles to the fimc-lite device nodes
+- samsung,fimc-is	: phandle to the fimc-is device node
+
+The pinctrl bindings defined in ../pinctrl/pinctrl-bindings.txt must be used
+to define a required pinctrl state named "default".
+
+'parallel-ports' node
+---------------------
+
+This node should contain child 'port' nodes specifying active parallel video
+input ports. It includes camera A, camera B and RGB bay inputs.
+'reg' property in the port nodes specifies the input type:
+ 1 - parallel camport A
+ 2 - parallel camport B
+ 5 - RGB camera bay
+
+3, 4 are for MIPI CSI-2 bus and are already described in samsung-mipi-csis.txt
+
+Image sensor nodes
+------------------
+
+The sensor device nodes should be added to their control bus controller (e.g.
+I2C0) nodes and linked to a port node in the csis or the parallel-ports node,
+using the common video interfaces bindings, defined in video-interfaces.txt.
+
+Example:
+
+	aliases {
+		fimc-lite0 = &fimc_lite_0
+	};
+
+	/* Parallel bus IF sensor */
+	i2c_0: i2c@13860000 {
+		s5k6aa: sensor@3c {
+			compatible = "samsung,s5k6aafx";
+			reg = <0x3c>;
+			vddio-supply = <...>;
+
+			clock-frequency = <24000000>;
+			clocks = <...>;
+			clock-names = "mclk";
+
+			port {
+				s5k6aa_ep: endpoint {
+					remote-endpoint = <&fimc0_ep>;
+					bus-width = <8>;
+					hsync-active = <0>;
+					vsync-active = <1>;
+					pclk-sample = <1>;
+				};
+			};
+		};
+	};
+
+	/* MIPI CSI-2 bus IF sensor */
+	s5c73m3: sensor@1a {
+		compatible = "samsung,s5c73m3";
+		reg = <0x1a>;
+		vddio-supply = <...>;
+
+		clock-frequency = <24000000>;
+		clocks = <...>;
+		clock-names = "mclk";
+
+		port {
+			s5c73m3_1: endpoint {
+				data-lanes = <1 2 3 4>;
+				remote-endpoint = <&csis0_ep>;
+			};
+		};
+	};
+
+	camera {
+		compatible = "samsung,exynos5250-fimc";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		status = "okay";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&cam_port_a_clk_active>;
+
+		samsung,csis = <&csis_0>, <&csis_1>;
+		samsung,fimc-lite = <&fimc_lite_0>, <&fimc_lite_1>, <&fimc_lite_2>;
+		samsung,fimc-is = <&fimc_is>;
+
+		/* parallel camera ports */
+		parallel-ports {
+			/* camera A input */
+			port@1 {
+				reg = <1>;
+				camport_a_ep: endpoint {
+					remote-endpoint = <&s5k6aa_ep>;
+					bus-width = <8>;
+					hsync-active = <0>;
+					vsync-active = <1>;
+					pclk-sample = <1>;
+				};
+			};
+		};
+	};
+
+MIPI-CSIS device binding is defined in samsung-mipi-csis.txt, FIMC-LITE
+device binding is defined in exynos-fimc-lite.txt and FIMC-IS binding
+is defined in exynos5-fimc-is.txt.