[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>

diff --git a/Documentation/devicetree/bindings/media/exynos5250-camera.txt b/Documentation/devicetree/bindings/media/exynos5250-camera.txt
new file mode 100644 (file)
index 0000000..09420ba
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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.