media: dt-bindings: media: Add Allwinner V3s Camera Sensor Interface (CSI)

Add binding documentation for Allwinner V3s CSI.

Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Yong Deng <yong.deng@magewell.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/Documentation/devicetree/bindings/media/sun6i-csi.txt b/Documentation/devicetree/bindings/media/sun6i-csi.txt
new file mode 100644 (file)
index 0000000..443e18c
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/sun6i-csi.txt
@@ -0,0 +1,56 @@
+Allwinner V3s Camera Sensor Interface
+-------------------------------------
+
+Allwinner V3s SoC features a CSI module(CSI1) with 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
+
+The 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.
+
+Endpoint node properties for CSI
+---------------------------------
+See the video-interfaces.txt for a detailed description of these properties.
+- 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         : (required; parallel-only)
+- vsync-active         : (required; parallel-only)
+
+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 */
+               };
+       };
+};

diff --git a/MAINTAINERS b/MAINTAINERS
index f0ef370..fb811fd 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3920,6 +3920,14 @@ M:       Jaya Kumar <jayakumar.alsa@gmail.com>
 S:     Maintained
 F:     sound/pci/cs5535audio/
 
+CSI DRIVERS FOR ALLWINNER V3s
+M:     Yong Deng <yong.deng@magewell.com>
+L:     linux-media@vger.kernel.org
+T:     git git://linuxtv.org/media_tree.git
+S:     Maintained
+F:     drivers/media/platform/sunxi/sun6i-csi/
+F:     Documentation/devicetree/bindings/media/sun6i-csi.txt
+
 CW1200 WLAN driver
 M:     Solomon Peachy <pizza@shaftnet.org>
 S:     Maintained