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 ...
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