Add bindings documentation for Renesas Capture Engine Unit (CEU).

Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
Reviewed-by: Rob Herring <r...@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verk...@cisco.com>
---
 .../devicetree/bindings/media/renesas,ceu.txt      | 81 ++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/renesas,ceu.txt

diff --git a/Documentation/devicetree/bindings/media/renesas,ceu.txt 
b/Documentation/devicetree/bindings/media/renesas,ceu.txt
new file mode 100644
index 0000000..3fc66df
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+++ b/Documentation/devicetree/bindings/media/renesas,ceu.txt
@@ -0,0 +1,81 @@
+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: Shall be "renesas,r7s72100-ceu" for CEU units found in RZ/A1H
+  and RZ/A1M SoCs.
+- 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.
+
+- hsync-active: Active state of the HSYNC signal, 0/1 for LOW/HIGH 
respectively.
+  If property is not present, default is active high.
+- vsync-active: Active state of the VSYNC signal, 0/1 for LOW/HIGH 
respectively.
+  If property is not present, default is active high.
+
+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,r7s72100-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

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