media: dt-bindings: Document MIPID02 bindings

This adds documentation of device tree for MIPID02 CSI-2 to PARALLEL
bridge.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mickael Guene <mickael.guene@st.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/i2c/st,st-mipid02.txt b/Documentation/devicetree/bindings/media/i2c/st,st-mipid02.txt
new file mode 100644 (file)
index 0000000..7976e6c
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/st,st-mipid02.txt
@@ -0,0 +1,82 @@
+STMicroelectronics MIPID02 CSI-2 to PARALLEL bridge
+
+MIPID02 has two CSI-2 input ports, only one of those ports can be active at a
+time. Active port input stream will be de-serialized and its content outputted
+through PARALLEL output port.
+CSI-2 first input port is a dual lane 800Mbps per lane whereas CSI-2 second
+input port is a single lane 800Mbps. Both ports support clock and data lane
+polarity swap. First port also supports data lane swap.
+PARALLEL output port has a maximum width of 12 bits.
+Supported formats are RAW6, RAW7, RAW8, RAW10, RAW12, RGB565, RGB888, RGB444,
+YUV420 8-bit, YUV422 8-bit and YUV420 10-bit.
+
+Required Properties:
+- compatible: shall be "st,st-mipid02"
+- clocks: reference to the xclk input clock.
+- clock-names: shall be "xclk".
+- VDDE-supply: sensor digital IO supply. Must be 1.8 volts.
+- VDDIN-supply: sensor internal regulator supply. Must be 1.8 volts.
+
+Optional Properties:
+- reset-gpios: reference to the GPIO connected to the xsdn pin, if any.
+              This is an active low signal to the mipid02.
+
+Required subnodes:
+  - ports: A ports node with one port child node per device input and output
+          port, in accordance with the video interface bindings defined in
+          Documentation/devicetree/bindings/media/video-interfaces.txt. The
+          port nodes are numbered as follows:
+
+          Port Description
+          -----------------------------
+          0    CSI-2 first input port
+          1    CSI-2 second input port
+          2    PARALLEL output
+
+Endpoint node required property for CSI-2 connection is:
+- data-lanes: shall be <1> for Port 1. for Port 0 dual-lane operation shall be
+<1 2> or <2 1>. For Port 0 single-lane operation shall be <1> or <2>.
+Endpoint node optional property for CSI-2 connection is:
+- lane-polarities: any lane can be inverted or not.
+
+Endpoint node required property for PARALLEL connection is:
+- bus-width: shall be set to <6>, <7>, <8>, <10> or <12>.
+Endpoint node optional properties for PARALLEL connection are:
+- hsync-active: active state of the HSYNC signal, 0/1 for LOW/HIGH respectively.
+LOW being the default.
+- vsync-active: active state of the VSYNC signal, 0/1 for LOW/HIGH respectively.
+LOW being the default.
+
+Example:
+
+mipid02: csi2rx@14 {
+       compatible = "st,st-mipid02";
+       reg = <0x14>;
+       status = "okay";
+       clocks = <&clk_ext_camera_12>;
+       clock-names = "xclk";
+       VDDE-supply = <&vdd>;
+       VDDIN-supply = <&vdd>;
+       ports {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               port@0 {
+                       reg = <0>;
+
+                       ep0: endpoint {
+                               data-lanes = <1 2>;
+                               remote-endpoint = <&mipi_csi2_in>;
+                       };
+               };
+               port@2 {
+                       reg = <2>;
+
+                       ep2: endpoint {
+                               bus-width = <8>;
+                               hsync-active = <0>;
+                               vsync-active = <0>;
+                               remote-endpoint = <&parallel_out>;
+                       };
+               };
+       };
+};

diff --git a/MAINTAINERS b/MAINTAINERS
index c6c15de..fbcbdf8 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14667,6 +14667,13 @@ S:     Maintained
 F:     drivers/iio/imu/st_lsm6dsx/
 F:     Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt
 
+ST MIPID02 CSI-2 TO PARALLEL BRIDGE DRIVER
+M:     Mickael Guene <mickael.guene@st.com>
+L:     linux-media@vger.kernel.org
+T:     git git://linuxtv.org/media_tree.git
+S:     Maintained
+F:     Documentation/devicetree/bindings/media/i2c/st,st-mipid02.txt
+
 ST STM32 I2C/SMBUS DRIVER
 M:     Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
 L:     linux-i2c@vger.kernel.org