mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-10 15:54:39 +08:00
709c81b55c
The spi-mux serves as both a SPI peripheral and controller, so add a reference to spi-peripheral-props.yaml in addition to spi-controller.yaml. This is necessary to avoid unevaluatedProperties warnings once those are fully enabled. Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Link: https://lore.kernel.org/r/20220105183234.3426649-1-robh@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
89 lines
2.7 KiB
YAML
89 lines
2.7 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/spi/spi-mux.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: Generic SPI Multiplexer
|
|
|
|
description: |
|
|
This binding describes a SPI bus multiplexer to route the SPI chip select
|
|
signals. This can be used when you need more devices than the SPI controller
|
|
has chip selects available. An example setup is shown in ASCII art; the actual
|
|
setting of the multiplexer to a channel needs to be done by a specific SPI mux
|
|
driver.
|
|
|
|
MOSI /--------------------------------+--------+--------+--------\
|
|
MISO |/------------------------------+|-------+|-------+|-------\|
|
|
SCL ||/----------------------------+||------+||------+||------\||
|
|
||| ||| ||| ||| |||
|
|
+------------+ ||| ||| ||| |||
|
|
| SoC ||| | +-+++-+ +-+++-+ +-+++-+ +-+++-+
|
|
| ||| | | dev | | dev | | dev | | dev |
|
|
| +--+++-+ | CS-X +------+\ +--+--+ +--+--+ +--+--+ +--+--+
|
|
| | SPI +-|-------+ Mux |\\ CS-0 | | | |
|
|
| +------+ | +--+---+\\\-------/ CS-1 | | |
|
|
| | | \\\----------------/ CS-2 | |
|
|
| +------+ | | \\-------------------------/ CS-3 |
|
|
| | ? +-|----------/ \----------------------------------/
|
|
| +------+ |
|
|
+------------+
|
|
|
|
allOf:
|
|
- $ref: "/schemas/spi/spi-controller.yaml#"
|
|
- $ref: "/schemas/spi/spi-peripheral-props.yaml#"
|
|
|
|
maintainers:
|
|
- Chris Packham <chris.packham@alliedtelesis.co.nz>
|
|
|
|
properties:
|
|
compatible:
|
|
const: spi-mux
|
|
|
|
mux-controls:
|
|
maxItems: 1
|
|
|
|
required:
|
|
- compatible
|
|
- reg
|
|
- spi-max-frequency
|
|
- mux-controls
|
|
|
|
unevaluatedProperties: false
|
|
|
|
examples:
|
|
- |
|
|
#include <dt-bindings/gpio/gpio.h>
|
|
mux: mux-controller {
|
|
compatible = "gpio-mux";
|
|
#mux-control-cells = <0>;
|
|
|
|
mux-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>;
|
|
};
|
|
|
|
spi {
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
spi@0 {
|
|
compatible = "spi-mux";
|
|
reg = <0>;
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
spi-max-frequency = <100000000>;
|
|
|
|
mux-controls = <&mux>;
|
|
|
|
flash@0 {
|
|
compatible = "jedec,spi-nor";
|
|
reg = <0>;
|
|
spi-max-frequency = <40000000>;
|
|
};
|
|
|
|
sensor@1 {
|
|
compatible = "bosch,bme680";
|
|
reg = <1>;
|
|
spi-max-frequency = <10000000>;
|
|
};
|
|
};
|
|
};
|