| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame^] | 1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/display/dsi-controller.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Common Properties for DSI Display Panels |
| 8 | |
| 9 | maintainers: |
| 10 | - Linus Walleij <linus.walleij@linaro.org> |
| 11 | |
| 12 | description: | |
| 13 | This document defines device tree properties common to DSI, Display |
| 14 | Serial Interface controllers and attached panels. It doesn't constitute |
| 15 | a device tree binding specification by itself but is meant to be referenced |
| 16 | by device tree bindings. |
| 17 | |
| 18 | When referenced from panel device tree bindings the properties defined in |
| 19 | this document are defined as follows. The panel device tree bindings are |
| 20 | responsible for defining whether each property is required or optional. |
| 21 | |
| 22 | Notice: this binding concerns DSI panels connected directly to a master |
| 23 | without any intermediate port graph to the panel. Each DSI master |
| 24 | can control one to four virtual channels to one panel. Each virtual |
| 25 | channel should have a node "panel" for their virtual channel with their |
| 26 | reg-property set to the virtual channel number, usually there is just |
| 27 | one virtual channel, number 0. |
| 28 | |
| 29 | properties: |
| 30 | $nodename: |
| 31 | pattern: "^dsi(@.*)?$" |
| 32 | |
| 33 | clock-master: |
| 34 | type: boolean |
| 35 | description: |
| 36 | Should be enabled if the host is being used in conjunction with |
| 37 | another DSI host to drive the same peripheral. Hardware supporting |
| 38 | such a configuration generally requires the data on both the busses |
| 39 | to be driven by the same clock. Only the DSI host instance |
| 40 | controlling this clock should contain this property. |
| 41 | |
| 42 | "#address-cells": |
| 43 | const: 1 |
| 44 | |
| 45 | "#size-cells": |
| 46 | const: 0 |
| 47 | |
| 48 | patternProperties: |
| 49 | "^panel@[0-3]$": |
| 50 | description: Panels connected to the DSI link |
| 51 | type: object |
| 52 | |
| 53 | properties: |
| 54 | reg: |
| 55 | minimum: 0 |
| 56 | maximum: 3 |
| 57 | description: |
| 58 | The virtual channel number of a DSI peripheral. Must be in the range |
| 59 | from 0 to 3, as DSI uses a 2-bit addressing scheme. Some DSI |
| 60 | peripherals respond to more than a single virtual channel. In that |
| 61 | case the reg property can take multiple entries, one for each virtual |
| 62 | channel that the peripheral responds to. |
| 63 | |
| 64 | enforce-video-mode: |
| 65 | type: boolean |
| 66 | description: |
| 67 | The best option is usually to run a panel in command mode, as this |
| 68 | gives better control over the panel hardware. However for different |
| 69 | reasons like broken hardware, missing features or testing, it may be |
| 70 | useful to be able to force a command mode-capable panel into video |
| 71 | mode. |
| 72 | |
| 73 | required: |
| 74 | - reg |
| 75 | |
| 76 | additionalProperties: true |
| 77 | |
| 78 | examples: |
| 79 | - | |
| 80 | #include <dt-bindings/gpio/gpio.h> |
| 81 | dsi@a0351000 { |
| 82 | reg = <0xa0351000 0x1000>; |
| 83 | #address-cells = <1>; |
| 84 | #size-cells = <0>; |
| 85 | panel@0 { |
| 86 | compatible = "sony,acx424akp"; |
| 87 | reg = <0>; |
| 88 | vddi-supply = <&ab8500_ldo_aux1_reg>; |
| 89 | reset-gpios = <&gpio2 1 GPIO_ACTIVE_LOW>; |
| 90 | }; |
| 91 | }; |
| 92 | |
| 93 | ... |