104 lines
2.4 KiB
YAML
104 lines
2.4 KiB
YAML
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# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/display/panel/tpo,tpg110.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: TPO TPG110 Panel
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maintainers:
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- Linus Walleij <linus.walleij@linaro.org>
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- Thierry Reding <thierry.reding@gmail.com>
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description: |+
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This panel driver is a component that acts as an intermediary
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between an RGB output and a variety of panels. The panel
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driver is strapped up in electronics to the desired resolution
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and other properties, and has a control interface over 3WIRE
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SPI. By talking to the TPG110 over SPI, the strapped properties
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can be discovered and the hardware is therefore mostly
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self-describing.
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+--------+
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SPI -> | TPO | -> physical display
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RGB -> | TPG110 |
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+--------+
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If some electrical strap or alternate resolution is desired,
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this can be set up by taking software control of the display
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over the SPI interface. The interface can also adjust
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for properties of the display such as gamma correction and
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certain electrical driving levels.
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The TPG110 does not know the physical dimensions of the panel
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connected, so this needs to be specified in the device tree.
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It requires a GPIO line for control of its reset line.
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The serial protocol has line names that resemble I2C but the
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protocol is not I2C but 3WIRE SPI.
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allOf:
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- $ref: panel-common.yaml#
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properties:
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compatible:
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oneOf:
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- items:
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- enum:
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- ste,nomadik-nhk15-display
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- const: tpo,tpg110
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- const: tpo,tpg110
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reg: true
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grestb-gpios:
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maxItems: 1
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description: panel reset GPIO
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spi-3wire: true
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spi-max-frequency:
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const: 3000000
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required:
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- compatible
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- reg
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- grestb-gpios
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- width-mm
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- height-mm
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- spi-3wire
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- spi-max-frequency
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- port
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unevaluatedProperties: false
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examples:
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- |+
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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panel: display@0 {
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compatible = "tpo,tpg110";
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reg = <0>;
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spi-3wire;
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/* 320 ns min period ~= 3 MHz */
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spi-max-frequency = <3000000>;
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/* Width and height from data sheet */
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width-mm = <116>;
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height-mm = <87>;
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grestb-gpios = <&foo_gpio 5 1>;
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backlight = <&bl>;
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port {
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nomadik_clcd_panel: endpoint {
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remote-endpoint = <&foo>;
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};
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};
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};
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};
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...
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