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cb8680a4b8
Add device-tree binding documentation for ti framebuffer and generic panel output driver. Signed-off-by: Dario Binacchi <dariobin@libero.it> Reviewed-by: Simon Glass <sjg@chromium.org>
82 lines
2.8 KiB
Text
82 lines
2.8 KiB
Text
Device-Tree bindings for tilcdc DRM driver
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Required properties:
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- compatible: value should be one of the following:
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- "ti,am33xx-tilcdc" for AM335x based boards
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- "ti,da850-tilcdc" for DA850/AM18x/OMAP-L138 based boards
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- interrupts: the interrupt number
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- reg: base address and size of the LCDC device
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Recommended properties:
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- ti,hwmods: Name of the hwmod associated to the LCDC
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Optional properties:
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- max-bandwidth: The maximum pixels per second that the memory
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interface / lcd controller combination can sustain
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- max-width: The maximum horizontal pixel width supported by
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the lcd controller.
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- max-pixelclock: The maximum pixel clock that can be supported
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by the lcd controller in KHz.
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- blue-and-red-wiring: Recognized values "straight" or "crossed".
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This property deals with the LCDC revision 2 (found on AM335x)
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color errata [1].
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- "straight" indicates normal wiring that supports RGB565,
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BGR888, and XBGR8888 color formats.
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- "crossed" indicates wiring that has blue and red wires
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crossed. This setup supports BGR565, RGB888 and XRGB8888
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formats.
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- If the property is not present or its value is not recognized
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the legacy mode is assumed. This configuration supports RGB565,
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RGB888 and XRGB8888 formats. However, depending on wiring, the red
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and blue colors are swapped in either 16 or 24-bit color modes.
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Optional nodes:
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- port/ports: to describe a connection to an external encoder. The
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binding follows Documentation/devicetree/bindings/graph.txt and
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supports a single port with a single endpoint.
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- See also Documentation/devicetree/bindings/display/tilcdc/panel.txt and
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Documentation/devicetree/bindings/display/tilcdc/tfp410.txt for connecting
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tfp410 DVI encoder or lcd panel to lcdc
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[1] There is an errata about AM335x color wiring. For 16-bit color mode
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the wires work as they should (LCD_DATA[0:4] is for Blue[3:7]),
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but for 24 bit color modes the wiring of blue and red components is
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crossed and LCD_DATA[0:4] is for Red[3:7] and LCD_DATA[11:15] is
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for Blue[3-7]. For more details see section 3.1.1 in AM335x
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Silicon Errata:
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http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=sprz360
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Example:
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fb: fb@4830e000 {
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compatible = "ti,am33xx-tilcdc", "ti,da850-tilcdc";
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reg = <0x4830e000 0x1000>;
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interrupt-parent = <&intc>;
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interrupts = <36>;
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ti,hwmods = "lcdc";
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blue-and-red-wiring = "crossed";
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port {
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lcdc_0: endpoint@0 {
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remote-endpoint = <&hdmi_0>;
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};
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};
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};
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tda19988: tda19988 {
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compatible = "nxp,tda998x";
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reg = <0x70>;
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pinctrl-names = "default", "off";
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pinctrl-0 = <&nxp_hdmi_bonelt_pins>;
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pinctrl-1 = <&nxp_hdmi_bonelt_off_pins>;
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port {
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hdmi_0: endpoint@0 {
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remote-endpoint = <&lcdc_0>;
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};
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};
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};
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