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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/display/atmel,lcdc-display.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/display/atmel,lcdc-display.yaml#

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$schema: http://devicetree.org/meta-schemas/core.yaml#

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title: Microchip's LCDC Display

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maintainers:

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  - Nicolas Ferre <nicolas.ferre@microchip.com>

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  - Dharma Balasubiramani <dharma.b@microchip.com>

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description:

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  The LCD Controller (LCDC) consists of logic for transferring LCD image data

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  from an external display buffer to a TFT LCD panel. The LCDC has one display

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  input buffer per layer that fetches pixels through the single bus host

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  interface and a look-up table to allow palletized display configurations. The

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  LCDC is programmable on a per layer basis, and supports different LCD

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  resolutions, window sizes, image formats and pixel depths.

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# We need a select here since this schema is applicable only for nodes with the

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# following properties

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select:

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  anyOf:

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    - required: [ 'atmel,dmacon' ]

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    - required: [ 'atmel,lcdcon2' ]

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    - required: [ 'atmel,guard-time' ]

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properties:

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  atmel,dmacon:

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    $ref: /schemas/types.yaml#/definitions/uint32

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    description: dma controller configuration

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  atmel,lcdcon2:

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    $ref: /schemas/types.yaml#/definitions/uint32

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    description: lcd controller configuration

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  atmel,guard-time:

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    $ref: /schemas/types.yaml#/definitions/uint32

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    description: lcd guard time (Delay in frame periods)

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    maximum: 127

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  bits-per-pixel:

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    $ref: /schemas/types.yaml#/definitions/uint32

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    description: lcd panel bit-depth.

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    enum: [1, 2, 4, 8, 16, 24, 32]

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  atmel,lcdcon-backlight:

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    $ref: /schemas/types.yaml#/definitions/flag

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    description: enable backlight

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  atmel,lcdcon-backlight-inverted:

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    $ref: /schemas/types.yaml#/definitions/flag

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    description: invert backlight PWM polarity

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  atmel,lcd-wiring-mode:

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    $ref: /schemas/types.yaml#/definitions/string

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    description: lcd wiring mode "RGB" or "BRG"

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    enum:

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      - RGB

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      - BRG

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  atmel,power-control-gpio:

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    description: gpio to power on or off the LCD (as many as needed)

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    maxItems: 1

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  display-timings:

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    $ref: panel/display-timings.yaml#

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required:

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  - atmel,dmacon

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  - atmel,lcdcon2

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  - atmel,guard-time

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  - bits-per-pixel

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additionalProperties: false

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examples:

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  - |

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    display: panel {

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      bits-per-pixel = <32>;

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      atmel,lcdcon-backlight;

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      atmel,dmacon = <0x1>;

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      atmel,lcdcon2 = <0x80008002>;

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      atmel,guard-time = <9>;

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      atmel,lcd-wiring-mode = "RGB";

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      display-timings {

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        native-mode = <&timing0>;

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        timing0: timing0 {

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          clock-frequency = <9000000>;

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          hactive = <480>;

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          vactive = <272>;

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          hback-porch = <1>;

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          hfront-porch = <1>;

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          vback-porch = <40>;

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          vfront-porch = <1>;

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          hsync-len = <45>;

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          vsync-len = <1>;

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        };

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      };

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    };

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