[PATCH 1/4] Documentation/devicetree/bindings/video/bridge: megachips-stdpxxxx-ge-b850v3-fw

[Peter Senna Tschudin]

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 at ideasonboard.com>
Cc: Martyn Welch <martyn.welch at collabora.co.uk>
Cc: Martin Donnelly <martin.donnelly at ge.com>
Cc: Javier Martinez Canillas <javier at dowhile0.org>
Cc: Enric Balletbo i Serra <enric.balletbo at collabora.com>
Cc: Philipp Zabel <p.zabel at pengutronix.de>
Cc: Rob Herring <robh at kernel.org>
Cc: Fabio Estevam <fabio.estevam at nxp.com>
Signed-off-by: Peter Senna Tschudin <peter.senna at 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 at 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 at 0 {
+				reg = <0>;
+				stdp4028_in: endpoint {
+					remote-endpoint = <&lvds0_out>;
+				};
+			};
+			port at 1 {
+				reg = <1>;
+				stdp4028_out: endpoint {
+					remote-endpoint = <&stdp2690_in>;
+				};
+			};
+		};
+	};
+
+	stdp2690 at 72 {
+		compatible = "megachips,stdp2690-ge-b850v3-fw";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		reg = <0x72>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port at 0 {
+				reg = <0>;
+				stdp2690_in: endpoint {
+					remote-endpoint = <&stdp4028_out>;
+				};
+			};
+
+			port at 1 {
+				reg = <1>;
+				stdp2690_out: endpoint {
+					/* Connector for external display */
+				};
+			};
+		};
+	};
+};
-- 
2.5.5