Add bindings documentation for Renesas Capture Engine Unit (CEU).
Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
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+Renesas Capture Engine Unit (CEU)
+----------------------------------------------
+
+The Capture Engine Unit is the image capture interface found on Renesas
+RZ chip series and on SH Mobile ones.
+
+The interface supports a single parallel input with data bus width up to
+8/16 bits.
+
+Required properties:
+- compatible
+ Must be one of:
+ - "renesas,ceu"
+ - "renesas,r7s72100-ceu"
+- reg
+ Physical address base and size.
+- interrupts
+ The interrupt specifier.
+- pinctrl-names, pinctrl-0
+ phandle of pin controller sub-node configuring pins for CEU operations.
+- remote-endpoint
+ phandle to an 'endpoint' subnode of a remote device node.
+
+CEU supports a single parallel input and should contain a single 'port' subnode
+with a single 'endpoint'. Optional endpoint properties applicable to parallel
+input bus described in "video-interfaces.txt" supported by this driver are:
+
+- 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 sitting on bus i2c1.
+
+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
