dt-bindings: display: megachips-stdpxxxx-ge-b850v3-fw

Devicetree binding documentation for the second video output
of the GE B850v3:
   STDP4028-ge-b850v3-fw bridges (LVDS-DP)
   STDP2690-ge-b850v3-fw bridges (DP-DP++)

Added entry for MegaChips at:
 Documentation/devicetree/bindings/vendor-prefixes.txt

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Martyn Welch <martyn.welch@collabora.co.uk>
Cc: Martin Donnelly <martin.donnelly@ge.com>
Cc: Javier Martinez Canillas <javier@dowhile0.org>
Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/c2712336226c5170cfdc45103527fb2338d3d6cf.1488555615.git.peter.senna@collabora.com

diff --git a/Documentation/devicetree/bindings/display/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt b/Documentation/devicetree/bindings/display/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt
new file mode 100644 (file)
index 0000000..7baa658
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt
@@ -0,0 +1,94 @@
+Drivers for the second video output of the GE B850v3:
+   STDP4028-ge-b850v3-fw bridges (LVDS-DP)
+   STDP2690-ge-b850v3-fw bridges (DP-DP++)
+
+The video processing pipeline on the second output on the GE B850v3:
+
+   Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output
+
+Each bridge has a dedicated flash containing firmware for supporting the custom
+design. The result is that, in this design, neither the STDP4028 nor the
+STDP2690 behave as the stock bridges would. The compatible strings include the
+suffix "-ge-b850v3-fw" to make it clear that the driver is for the bridges with
+the firmware specific for the GE B850v3.
+
+The hardware do not provide control over the video processing pipeline, as the
+two bridges behaves as a single one. The only interfaces exposed by the
+hardware are EDID, HPD, and interrupts.
+
+stdp4028-ge-b850v3-fw required properties:
+  - compatible : "megachips,stdp4028-ge-b850v3-fw"
+  - reg : I2C bus address
+  - interrupt-parent : phandle of the interrupt controller that services
+    interrupts to the device
+  - interrupts : one interrupt should be described here, as in
+    <0 IRQ_TYPE_LEVEL_HIGH>
+  - ports : One input port(reg = <0>) and one output port(reg = <1>)
+
+stdp2690-ge-b850v3-fw required properties:
+    compatible : "megachips,stdp2690-ge-b850v3-fw"
+  - reg : I2C bus address
+  - ports : One input port(reg = <0>) and one output port(reg = <1>)
+
+Example:
+
+&mux2_i2c2 {
+       status = "okay";
+       clock-frequency = <100000>;
+
+       stdp4028@73 {
+               compatible = "megachips,stdp4028-ge-b850v3-fw";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               reg = <0x73>;
+
+               interrupt-parent = <&gpio2>;
+               interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+
+               ports {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       port@0 {
+                               reg = <0>;
+                               stdp4028_in: endpoint {
+                                       remote-endpoint = <&lvds0_out>;
+                               };
+                       };
+                       port@1 {
+                               reg = <1>;
+                               stdp4028_out: endpoint {
+                                       remote-endpoint = <&stdp2690_in>;
+                               };
+                       };
+               };
+       };
+
+       stdp2690@72 {
+               compatible = "megachips,stdp2690-ge-b850v3-fw";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               reg = <0x72>;
+
+               ports {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       port@0 {
+                               reg = <0>;
+                               stdp2690_in: endpoint {
+                                       remote-endpoint = <&stdp4028_out>;
+                               };
+                       };
+
+                       port@1 {
+                               reg = <1>;
+                               stdp2690_out: endpoint {
+                                       /* Connector for external display */
+                               };
+                       };
+               };
+       };
+};

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index f98498d..e6bccc2 100644 (file)
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -170,6 +170,7 @@ maxim       Maxim Integrated Products
 mcube  mCube
 meas   Measurement Specialties
 mediatek       MediaTek Inc.
+megachips      MegaChips
 melexis        Melexis N.V.
 melfas MELFAS Inc.
 memsic MEMSIC Inc.