Kernel-4.18.0-80.el8_panel-lvds

LVDS Display Panel

LVDS is a physical layer specification defined in ANSI/TIA/EIA-644-A. Multiple
incompatible data link layers have been used over time to transmit image data
to LVDS panels. This bindings supports display panels compatible with the
following specifications.

[JEIDA] “Digital Interface Standards for Monitor”, JEIDA-59-1999, February
1999 (Version 1.0), Japan Electronic Industry Development Association (JEIDA)
[LDI] “Open LVDS Display Interface”, May 1999 (Version 0.95), National
Semiconductor
[VESA] “VESA Notebook Panel Standard”, October 2007 (Version 1.0), Video
Electronics Standards Association (VESA)

Device compatible with those specifications have been marketed under the
FPD-Link and FlatLink brands.

Required properties:

• compatible: Shall contain “panel-lvds” in addition to a mandatory
  panel-specific compatible string defined in individual panel bindings. The
  “panel-lvds” value shall never be used on its own.
• width-mm: See panel-common.txt.
• height-mm: See panel-common.txt.
• data-mapping: The color signals mapping order, “jeida-18”, “jeida-24”
  or “vesa-24”.

Optional properties:

• label: See panel-common.txt.
• gpios: See panel-common.txt.
• backlight: See panel-common.txt.
• power-supply: See panel-common.txt.
• data-mirror: If set, reverse the bit order described in the data mappings
  below on all data lanes, transmitting bits for slots 6 to 0 instead of
  0 to 6.

Required nodes:

• panel-timing: See panel-common.txt.
• ports: See panel-common.txt. These bindings require a single port subnode
  corresponding to the panel LVDS input.

LVDS data mappings are defined as follows.

• “jeida-18” - 18-bit data mapping compatible with the [JEIDA], [LDI] and
  [VESA] specifications. Data are transferred as follows on 3 LVDS lanes.

Slot 0 1 2 3 4 5 6
____ _
Clock ___/
__ __ __ __ __ __ __
DATA0 ><__G0__><__R5__><__R4__><__R3__><__R2__><__R1__><__R0__><
DATA1 ><__B1__><__B0__><__G5__><__G4__><__G3__><__G2__><__G1__><
DATA2 ><_CTL2_><_CTL1_><_CTL0_><__B5__><__B4__><__B3__><__B2__><

• “jeida-24” - 24-bit data mapping compatible with the [DSIM] and [LDI]
  specifications. Data are transferred as follows on 4 LVDS lanes.

Slot 0 1 2 3 4 5 6
____ _
Clock ___/
__ __ __ __ __ __ __
DATA0 ><__G2__><__R7__><__R6__><__R5__><__R4__><__R3__><__R2__><
DATA1 ><__B3__><__B2__><__G7__><__G6__><__G5__><__G4__><__G3__><
DATA2 ><_CTL2_><_CTL1_><_CTL0_><__B7__><__B6__><__B5__><__B4__><
DATA3 ><_CTL3_><__B1__><__B0__><__G1__><__G0__><__R1__><__R0__><

• “vesa-24” - 24-bit data mapping compatible with the [VESA] specification.
  Data are transferred as follows on 4 LVDS lanes.

Slot 0 1 2 3 4 5 6
____ _
Clock ___/
__ __ __ __ __ __ __
DATA0 ><__G0__><__R5__><__R4__><__R3__><__R2__><__R1__><__R0__><
DATA1 ><__B1__><__B0__><__G5__><__G4__><__G3__><__G2__><__G1__><
DATA2 ><_CTL2_><_CTL1_><_CTL0_><__B5__><__B4__><__B3__><__B2__><
DATA3 ><_CTL3_><__B7__><__B6__><__G7__><__G6__><__R7__><__R6__><

Control signals are mapped as follows.

CTL0: HSync
CTL1: VSync
CTL2: Data Enable
CTL3: 0

Example

panel {
compatible = “mitsubishi,aa121td01”, “panel-lvds”;

width-mm = <261>;
height-mm = <163>;

data-mapping = "jeida-24";

panel-timing {
    /* 1280x800 @60Hz */
    clock-frequency = <71000000>;
    hactive = <1280>;
    vactive = <800>;
    hsync-len = <70>;
    hfront-porch = <20>;
    hback-porch = <70>;
    vsync-len = <5>;
    vfront-porch = <3>;
    vback-porch = <15>;
};

port {
    panel_in: endpoint {
        remote-endpoint = <&lvds_encoder>;
    };
};

};