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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/sharp,ls010b7dh04.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Sharp Memory LCD panels
maintainers:
- Alex Lanzano <lanzano.alex@gmail.com>
description:
Sharp Memory LCDs are a series of monochrome displays that operate over
a SPI bus. The displays require a signal (VCOM) to be generated to prevent
DC bias build up resulting in pixels being unable to change. Three modes
can be used to provide the VCOM signal ("software", "external", "pwm").
properties:
compatible:
enum:
- sharp,ls010b7dh04
- sharp,ls011b7dh03
- sharp,ls012b7dd01
- sharp,ls013b7dh03
- sharp,ls013b7dh05
- sharp,ls018b7dh02
- sharp,ls027b7dh01
- sharp,ls027b7dh01a
- sharp,ls032b7dd02
- sharp,ls044q7dh01
reg:
maxItems: 1
spi-max-frequency:
maximum: 2000000
sharp,vcom-mode:
$ref: /schemas/types.yaml#/definitions/string
description: |
software - This mode relies on a software operation to send a
"maintain display" message to the display, toggling the vcom
bit on and off with each message
external - This mode relies on an external clock to generate
the signal on the EXTCOMM pin
pwm - This mode relies on a pwm device to generate the signal
on the EXTCOMM pin
enum: [software, external, pwm]
enable-gpios: true
pwms:
maxItems: 1
description: External VCOM signal
required:
- compatible
- reg
- sharp,vcom-mode
allOf:
- $ref: panel/panel-common.yaml#
- $ref: /schemas/spi/spi-peripheral-props.yaml#
- if:
properties:
sharp,vcom-mode:
const: pwm
then:
required:
- pwms
unevaluatedProperties: false
examples:
- |
spi {
#address-cells = <1>;
#size-cells = <0>;
display@0 {
compatible = "sharp,ls013b7dh03";
reg = <0>;
spi-cs-high;
spi-max-frequency = <1000000>;
sharp,vcom-mode = "software";
};
};
...
|
