tjh.dev
Linux kernel mirror (for testing)
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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/display/sharp,ls010b7dh04.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Sharp Memory LCD panels
8
9maintainers:
10 - Alex Lanzano <lanzano.alex@gmail.com>
11
12description:
13 Sharp Memory LCDs are a series of monochrome displays that operate over
14 a SPI bus. The displays require a signal (VCOM) to be generated to prevent
15 DC bias build up resulting in pixels being unable to change. Three modes
16 can be used to provide the VCOM signal ("software", "external", "pwm").
17
18properties:
19 compatible:
20 enum:
21 - sharp,ls010b7dh04
22 - sharp,ls011b7dh03
23 - sharp,ls012b7dd01
24 - sharp,ls013b7dh03
25 - sharp,ls013b7dh05
26 - sharp,ls018b7dh02
27 - sharp,ls027b7dh01
28 - sharp,ls027b7dh01a
29 - sharp,ls032b7dd02
30 - sharp,ls044q7dh01
31
32 reg:
33 maxItems: 1
34
35 spi-max-frequency:
36 maximum: 2000000
37
38 sharp,vcom-mode:
39 $ref: /schemas/types.yaml#/definitions/string
40 description: |
41 software - This mode relies on a software operation to send a
42 "maintain display" message to the display, toggling the vcom
43 bit on and off with each message
44
45 external - This mode relies on an external clock to generate
46 the signal on the EXTCOMM pin
47
48 pwm - This mode relies on a pwm device to generate the signal
49 on the EXTCOMM pin
50
51 enum: [software, external, pwm]
52
53 enable-gpios: true
54
55 pwms:
56 maxItems: 1
57 description: External VCOM signal
58
59required:
60 - compatible
61 - reg
62 - sharp,vcom-mode
63
64allOf:
65 - $ref: panel/panel-common.yaml#
66 - $ref: /schemas/spi/spi-peripheral-props.yaml#
67
68 - if:
69 properties:
70 sharp,vcom-mode:
71 const: pwm
72 then:
73 required:
74 - pwms
75
76unevaluatedProperties: false
77
78examples:
79 - |
80 spi {
81 #address-cells = <1>;
82 #size-cells = <0>;
83
84 display@0 {
85 compatible = "sharp,ls013b7dh03";
86 reg = <0>;
87 spi-cs-high;
88 spi-max-frequency = <1000000>;
89 sharp,vcom-mode = "software";
90 };
91 };
92...