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