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@xxxxxxxxxxxxxxxx>
Cc: Martyn Welch <martyn.welch@xxxxxxxxxxxxxxx>
Cc: Martin Donnelly <martin.donnelly@xxxxxx>
Cc: Javier Martinez Canillas <javier@xxxxxxxxxxxx>
Cc: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Fabio Estevam <fabio.estevam@xxxxxxx>
Signed-off-by: Peter Senna Tschudin <peter.senna@xxxxxxxxxxxxx>
---
.../devicetree/bindings/vendor-prefixes.txt | 1 +
.../bridge/megachips-stdpxxxx-ge-b850v3-fw.txt | 92 ++++++++++++++++++++++
2 files changed, 93 insertions(+)
create mode 100644 Documentation/devicetree/bindings/video/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 1ef148d..b4c2f5c 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -175,6 +175,7 @@ maxim Maxim Integrated Products
mcube mCube
meas Measurement Specialties
mediatek MediaTek Inc.
+megachips MegaChips
melexis Melexis N.V.
melfas MELFAS Inc.
memsic MEMSIC Inc.
diff --git a/Documentation/devicetree/bindings/video/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt b/Documentation/devicetree/bindings/video/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt
new file mode 100644
index 0000000..471db27
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt
@@ -0,0 +1,92 @@
+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 driver is powerless to control the video processing pipeline, as the two
+bridges behaves as a single one. The driver is only needed for telling the host
+about EDID / HPD, and for giving the host powers to ack interrupts.
+
+Required properties:
+ - compatible : should be "megachips,stdp4028-ge-b850v3-fw" or
+ "megachips,stdp2690-ge-b850v3-fw".
+ - reg : should contain the main address which is used to communicate with
+ the bridge over i2c.
+ - interrupt-parent : phandle of the interrupt controller that services
+ interrupts to the device (stdp4028-ge-b850v3-fw)
+ - interrupts : one interrupt should be described here, as in
+ <0 IRQ_TYPE_LEVEL_HIGH> (stdp4028-ge-b850v3-fw)
+ - ports : should describe the video signal connection between the host
+ and the bridges.
+
+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 */
+ };
+ };
+ };
+ };
+};
--
2.5.5
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