| Dario Binacchi | cb8680a | 2020-02-22 14:05:47 +0100 | [diff] [blame] | 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/tilcdc/tfp410.txt 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 | http://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@0 { |
| 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@0 { |
| 79 | remote-endpoint = <&lcdc_0>; |
| 80 | }; |
| 81 | }; |
| 82 | }; |