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    Subject[PATCH 1/4] Documentation/devicetree/bindings/video/bridge: megachips-stdpxxxx-ge-b850v3-fw
    Date
    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>
    Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com>
    ---
    .../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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