tilcdc.txt

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    1 Device-Tree bindings for tilcdc DRM driver
    2 
    3 Required properties:
    4  - compatible: value should be one of the following:
    5     - "ti,am33xx-tilcdc" for AM335x based boards
    6     - "ti,da850-tilcdc" for DA850/AM18x/OMAP-L138 based boards
    7  - interrupts: the interrupt number
    8  - reg: base address and size of the LCDC device
    9 
   10 Recommended properties:
   11  - ti,hwmods: Name of the hwmod associated to the LCDC
   12 
   13 Optional properties:
   14  - max-bandwidth: The maximum pixels per second that the memory
   15    interface / lcd controller combination can sustain
   16  - max-width: The maximum horizontal pixel width supported by
   17    the lcd controller.
   18  - max-pixelclock: The maximum pixel clock that can be supported
   19    by the lcd controller in KHz.
   20  - blue-and-red-wiring: Recognized values "straight" or "crossed".
   21    This property deals with the LCDC revision 2 (found on AM335x)
   22    color errata [1].
   23     - "straight" indicates normal wiring that supports RGB565,
   24       BGR888, and XBGR8888 color formats.
   25     - "crossed" indicates wiring that has blue and red wires
   26       crossed. This setup supports BGR565, RGB888 and XRGB8888
   27       formats.
   28     - If the property is not present or its value is not recognized
   29       the legacy mode is assumed. This configuration supports RGB565,
   30       RGB888 and XRGB8888 formats. However, depending on wiring, the red
   31       and blue colors are swapped in either 16 or 24-bit color modes.
   32 
   33 Optional nodes:
   34 
   35  - port/ports: to describe a connection to an external encoder. The
   36    binding follows Documentation/devicetree/bindings/graph.txt and
   37    supports a single port with a single endpoint.
   38 
   39  - See also Documentation/devicetree/bindings/display/tilcdc/panel.txt and
   40    Documentation/devicetree/bindings/display/bridge/ti,tfp410.yaml for connecting
   41    tfp410 DVI encoder or lcd panel to lcdc
   42 
   43 [1] There is an errata about AM335x color wiring. For 16-bit color mode
   44     the wires work as they should (LCD_DATA[0:4] is for Blue[3:7]),
   45     but for 24 bit color modes the wiring of blue and red components is
   46     crossed and LCD_DATA[0:4] is for Red[3:7] and LCD_DATA[11:15] is
   47     for Blue[3-7]. For more details see section 3.1.1 in AM335x
   48     Silicon Errata:
   49     https://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=sprz360
   50 
   51 Example:
   52 
   53         fb: fb@4830e000 {
   54                 compatible = "ti,am33xx-tilcdc", "ti,da850-tilcdc";
   55                 reg = <0x4830e000 0x1000>;
   56                 interrupt-parent = <&intc>;
   57                 interrupts = <36>;
   58                 ti,hwmods = "lcdc";
   59 
   60                 blue-and-red-wiring = "crossed";
   61 
   62                 port {
   63                         lcdc_0: endpoint {
   64                                 remote-endpoint = <&hdmi_0>;
   65                         };
   66                 };
   67         };
   68 
   69         tda19988: tda19988 {
   70                 compatible = "nxp,tda998x";
   71                 reg = <0x70>;
   72 
   73                 pinctrl-names = "default", "off";
   74                 pinctrl-0 = <&nxp_hdmi_bonelt_pins>;
   75                 pinctrl-1 = <&nxp_hdmi_bonelt_off_pins>;
   76 
   77                 port {
   78                         hdmi_0: endpoint {
   79                                 remote-endpoint = <&lcdc_0>;
   80                         };
   81                 };
   82         };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/display/tilcdc/tilcdc.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/display/tilcdc/tilcdc.txt