[PATCH v7 1/2] dt-bindings: media: Add Allwinner V3s Camera Sensor Interface (CSI)

[Yong Deng <yong.deng@magewell.com>]

Add binding documentation for Allwinner V3s CSI.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Yong Deng <yong.deng@magewell.com>
---
 .../devicetree/bindings/media/sun6i-csi.txt        | 59 ++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/sun6i-csi.txt

diff --git a/Documentation/devicetree/bindings/media/sun6i-csi.txt b/Documentation/devicetree/bindings/media/sun6i-csi.txt
new file mode 100644
index 0000000..2ff47a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/sun6i-csi.txt
@@ -0,0 +1,59 @@
+Allwinner V3s Camera Sensor Interface
+-------------------------------------
+
+Allwinner V3s SoC features two CSI module. CSI0 is used for MIPI CSI-2
+interface and CSI1 is used for parallel interface.
+
+Required properties:
+  - compatible: value must be "allwinner,sun8i-v3s-csi"
+  - reg: base address and size of the memory-mapped region.
+  - interrupts: interrupt associated to this IP
+  - clocks: phandles to the clocks feeding the CSI
+    * bus: the CSI interface clock
+    * mod: the CSI module clock
+    * ram: the CSI DRAM clock
+  - clock-names: the clock names mentioned above
+  - resets: phandles to the reset line driving the CSI
+
+Each CSI node should contain one 'port' child node with one child 'endpoint'
+node, according to the bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt. As mentioned
+above, the endpoint's bus type should be MIPI CSI-2 for CSI0 and parallel or
+Bt656 for CSI1.
+
+Endpoint node properties for CSI1
+---------------------------------
+
+- remote-endpoint	: (required) a phandle to the bus receiver's endpoint
+			   node
+- bus-width:		: (required) must be 8, 10, 12 or 16
+- pclk-sample		: (optional) (default: sample on falling edge)
+- hsync-active		: (only required for parallel)
+- vsync-active		: (only required for parallel)
+
+Example:
+
+csi1: csi@1cb4000 {
+	compatible = "allwinner,sun8i-v3s-csi";
+	reg = <0x01cb4000 0x1000>;
+	interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+	clocks = <&ccu CLK_BUS_CSI>,
+		 <&ccu CLK_CSI1_SCLK>,
+		 <&ccu CLK_DRAM_CSI>;
+	clock-names = "bus", "mod", "ram";
+	resets = <&ccu RST_BUS_CSI>;
+
+	port {
+		/* Parallel bus endpoint */
+		csi1_ep: endpoint {
+			remote-endpoint = <&adv7611_ep>;
+			bus-width = <16>;
+
+			/* If hsync-active/vsync-active are missing,
+			   embedded BT.656 sync is used */
+			hsync-active = <0>; /* Active low */
+			vsync-active = <0>; /* Active low */
+			pclk-sample = <1>;  /* Rising */
+		};
+	};
+};
-- 
1.8.3.1