xref: /linux/Documentation/devicetree/bindings/display/panel/tpo,tpg110.yaml (revision 7482c19173b7eb044d476b3444d7ee55bc669d03) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/display/panel/tpo,tpg110.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: TPO TPG110 Panel
8
9maintainers:
10  - Linus Walleij <linus.walleij@linaro.org>
11  - Thierry Reding <thierry.reding@gmail.com>
12
13description: |+
14  This panel driver is a component that acts as an intermediary
15  between an RGB output and a variety of panels. The panel
16  driver is strapped up in electronics to the desired resolution
17  and other properties, and has a control interface over 3WIRE
18  SPI. By talking to the TPG110 over SPI, the strapped properties
19  can be discovered and the hardware is therefore mostly
20  self-describing.
21
22         +--------+
23  SPI -> |  TPO   | -> physical display
24  RGB -> | TPG110 |
25         +--------+
26
27  If some electrical strap or alternate resolution is desired,
28  this can be set up by taking software control of the display
29  over the SPI interface. The interface can also adjust
30  for properties of the display such as gamma correction and
31  certain electrical driving levels.
32
33  The TPG110 does not know the physical dimensions of the panel
34  connected, so this needs to be specified in the device tree.
35
36  It requires a GPIO line for control of its reset line.
37
38  The serial protocol has line names that resemble I2C but the
39  protocol is not I2C but 3WIRE SPI.
40
41
42allOf:
43  - $ref: panel-common.yaml#
44  - $ref: /schemas/spi/spi-peripheral-props.yaml#
45
46properties:
47  compatible:
48    oneOf:
49      - items:
50          - enum:
51              - ste,nomadik-nhk15-display
52          - const: tpo,tpg110
53      - const: tpo,tpg110
54
55  reg: true
56
57  grestb-gpios:
58    maxItems: 1
59    description: panel reset GPIO
60
61  spi-3wire: true
62
63  spi-max-frequency:
64    const: 3000000
65
66required:
67  - compatible
68  - reg
69  - grestb-gpios
70  - width-mm
71  - height-mm
72  - spi-3wire
73  - spi-max-frequency
74  - port
75
76unevaluatedProperties: false
77
78examples:
79  - |+
80    spi {
81      #address-cells = <1>;
82      #size-cells = <0>;
83
84      panel: display@0 {
85        compatible = "tpo,tpg110";
86        reg = <0>;
87        spi-3wire;
88        /* 320 ns min period ~= 3 MHz */
89        spi-max-frequency = <3000000>;
90        /* Width and height from data sheet */
91        width-mm = <116>;
92        height-mm = <87>;
93        grestb-gpios = <&foo_gpio 5 1>;
94        backlight = <&bl>;
95
96        port {
97          nomadik_clcd_panel: endpoint {
98            remote-endpoint = <&foo>;
99          };
100        };
101      };
102    };
103
104...
105