mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-09-06 21:14:18 +00:00
85250a2400
For devices connectable by SPI bus (e.g. already using "spi-max-frequency" property), reference the "spi-peripheral-props.yaml" schema to allow using all SPI device properties, even these which device bindings author did not tried yet. While changing additionalProperties->unevaluatedProperties, put it in typical place, just before example DTS. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Acked-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20221004115642.63749-8-krzysztof.kozlowski@linaro.org Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
64 lines
1.4 KiB
YAML
64 lines
1.4 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/iio/resolver/adi,ad2s90.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: Analog Devices AD2S90 Resolver-to-Digital Converter
|
|
|
|
maintainers:
|
|
- Matheus Tavares <matheus.bernardino@usp.br>
|
|
|
|
description: |
|
|
Datasheet: https://www.analog.com/en/products/ad2s90.html
|
|
|
|
properties:
|
|
compatible:
|
|
const: adi,ad2s90
|
|
|
|
reg:
|
|
maxItems: 1
|
|
|
|
spi-max-frequency:
|
|
maximum: 830000
|
|
description: |
|
|
Chip's max frequency, as specified in its datasheet, is 2Mhz. But a 600ns
|
|
delay is expected between the application of a logic LO to CS and the
|
|
application of SCLK, as also specified. And since the delay is not
|
|
implemented in the spi code, to satisfy it, SCLK's period should be at
|
|
most 2 * 600ns, so the max frequency should be 1 / (2 * 6e-7), which gives
|
|
roughly 830000Hz.
|
|
|
|
spi-cpol: true
|
|
|
|
spi-cpha: true
|
|
|
|
required:
|
|
- compatible
|
|
- reg
|
|
|
|
dependencies:
|
|
spi-cpol: [ spi-cpha ]
|
|
spi-cpha: [ spi-cpol ]
|
|
|
|
allOf:
|
|
- $ref: /schemas/spi/spi-peripheral-props.yaml#
|
|
|
|
unevaluatedProperties: false
|
|
|
|
examples:
|
|
- |
|
|
spi {
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
resolver@0 {
|
|
compatible = "adi,ad2s90";
|
|
reg = <0>;
|
|
spi-max-frequency = <830000>;
|
|
spi-cpol;
|
|
spi-cpha;
|
|
};
|
|
};
|
|
...
|