Add bindings documentation for Renesas Capture Engine Unit (CEU).
Signed-off-by: Jacopo Mondi <[email protected]>
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+Renesas Capture Engine Unit (CEU)
+----------------------------------------------
+
+The Capture Engine Unit is the image capture interface found in the Renesas
+SH Mobile and RZ SoCs.
+
+The interface supports a single parallel input with data bus width of 8 or 16
+bits.
+
+Required properties:
+- compatible: Must be one of the following.
+ - "renesas,r7s72100-ceu" for CEU units found in R7S72100 (RZ/A1) SoCs.
+ - "renesas,ceu" as a generic fallback.
+
+ SH Mobile CPUs do not currently support OF, and they configure their
+ CEU interfaces using platform data. The "compatible" list will be
+ expanded once SH Mobile will be made OF-capable.
+
+- reg: Registers address base and size.
+- interrupts: The interrupt specifier.
+
+The CEU supports a single parallel input and should contain a single 'port'
+subnode with a single 'endpoint'. Connection to input devices are modeled
+according to the video interfaces OF bindings specified in:
+Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Optional endpoint properties applicable to parallel input bus described in
+the above mentioned "video-interfaces.txt" file are supported by this driver:
+
+- hsync-active: Active state of the HSYNC signal, 0/1 for LOW/HIGH
respectively.
+- vsync-active: Active state of the VSYNC signal, 0/1 for LOW/HIGH
respectively.
+
+Example:
+
+The example describes the connection between the Capture Engine Unit and an
+OV7670 image sensor connected to i2c1 interface.
+
+ceu: ceu@e8210000 {
+ reg = <0xe8210000 0x209c>;
+ compatible = "renesas,ceu";
+ interrupts = <GIC_SPI 332 IRQ_TYPE_LEVEL_HIGH>;
+
+ pinctrl-names = "default";
+ pinctrl-0 = <&vio_pins>;
+
+ status = "okay";
+
+ port {
+ ceu_in: endpoint {
+ remote-endpoint = <&ov7670_out>;
+
+ hsync-active = <1>;
+ vsync-active = <0>;
+ };
+ };
+};
+
+i2c1: i2c@fcfee400 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c1_pins>;
+
+ status = "okay";
+
+ clock-frequency = <100000>;
+
+ ov7670: camera@21 {
+ compatible = "ovti,ov7670";
+ reg = <0x21>;
+
+ pinctrl-names = "default";
+ pinctrl-0 = <&vio_pins>;
+
+ reset-gpios = <&port3 11 GPIO_ACTIVE_LOW>;
+ powerdown-gpios = <&port3 12 GPIO_ACTIVE_HIGH>;
+
+ port {
+ ov7670_out: endpoint {
+ remote-endpoint = <&ceu_in>;
+
+ hsync-active = <1>;
+ vsync-active = <0>;
+ };
+ };
+ };
+};
--
2.7.4
