1Drivers for the second video output of the GE B850v3: 2 STDP4028-ge-b850v3-fw bridges (LVDS-DP) 3 STDP2690-ge-b850v3-fw bridges (DP-DP++) 4 5The video processing pipeline on the second output on the GE B850v3: 6 7 Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output 8 9Each bridge has a dedicated flash containing firmware for supporting the custom 10design. The result is that, in this design, neither the STDP4028 nor the 11STDP2690 behave as the stock bridges would. The compatible strings include the 12suffix "-ge-b850v3-fw" to make it clear that the driver is for the bridges with 13the firmware specific for the GE B850v3. 14 15The hardware do not provide control over the video processing pipeline, as the 16two bridges behaves as a single one. The only interfaces exposed by the 17hardware are EDID, HPD, and interrupts. 18 19stdp4028-ge-b850v3-fw required properties: 20 - compatible : "megachips,stdp4028-ge-b850v3-fw" 21 - reg : I2C bus address 22 - interrupts : one interrupt should be described here, as in 23 <0 IRQ_TYPE_LEVEL_HIGH> 24 - ports : One input port(reg = <0>) and one output port(reg = <1>) 25 26stdp2690-ge-b850v3-fw required properties: 27 compatible : "megachips,stdp2690-ge-b850v3-fw" 28 - reg : I2C bus address 29 - ports : One input port(reg = <0>) and one output port(reg = <1>) 30 31Example: 32 33&mux2_i2c2 { 34 clock-frequency = <100000>; 35 36 stdp4028@73 { 37 compatible = "megachips,stdp4028-ge-b850v3-fw"; 38 #address-cells = <1>; 39 #size-cells = <0>; 40 41 reg = <0x73>; 42 43 interrupt-parent = <&gpio2>; 44 interrupts = <0 IRQ_TYPE_LEVEL_HIGH>; 45 46 ports { 47 #address-cells = <1>; 48 #size-cells = <0>; 49 50 port@0 { 51 reg = <0>; 52 stdp4028_in: endpoint { 53 remote-endpoint = <&lvds0_out>; 54 }; 55 }; 56 port@1 { 57 reg = <1>; 58 stdp4028_out: endpoint { 59 remote-endpoint = <&stdp2690_in>; 60 }; 61 }; 62 }; 63 }; 64 65 stdp2690@72 { 66 compatible = "megachips,stdp2690-ge-b850v3-fw"; 67 #address-cells = <1>; 68 #size-cells = <0>; 69 70 reg = <0x72>; 71 72 ports { 73 #address-cells = <1>; 74 #size-cells = <0>; 75 76 port@0 { 77 reg = <0>; 78 stdp2690_in: endpoint { 79 remote-endpoint = <&stdp4028_out>; 80 }; 81 }; 82 83 port@1 { 84 reg = <1>; 85 stdp2690_out: endpoint { 86 /* Connector for external display */ 87 }; 88 }; 89 }; 90 }; 91}; 92