1Device-Tree bindings for tilcdc DRM driver 2 3Required 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 10Recommended properties: 11 - ti,hwmods: Name of the hwmod associated to the LCDC 12 13Optional 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 33Optional 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 51Example: 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 }; 83