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

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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
This commit is contained in:
Peter Senna Tschudin 2017-03-03 16:57:07 +01:00 committed by Archit Taneja
parent ca39b449f6
commit b2fdab37aa
2 changed files with 95 additions and 0 deletions
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94
Documentation/devicetree/bindings/display/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt Normal file
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@ -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 */
};
};
};
};
};

1
Documentation/devicetree/bindings/vendor-prefixes.txt
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@ -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.