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# SPDX-License-Identifier: GPL-
2.
0
%YAML
1.
2
---
$id:
http://devicetree.org/schemas/mux/reg-mux.yaml#
$schema:
http://devicetree.org/meta-schemas/core.yaml#
title: Generic register bitfield-based multiplexer controller
maintainers:
- Peter Rosin <peda@axentia.se>
description: |+
Define register bitfields to be used to control multiplexers. The parent
device tree node must be a device node to provide register r/w access.
properties:
compatible:
enum:
- reg-mux # parent device of mux controller is not syscon device
- mmio-mux # parent device of mux controller is syscon device
reg: true
'#mux-control-cells':
const:
1
mux-reg-masks:
$ref: /schemas/types.yaml#/definitions/uint32-matrix
items:
items:
- description: register offset
- description: pre-shifted bitfield mask
description: Each entry pair describes a single mux control.
idle-states: true
required:
- compatible
- mux-reg-masks
- '#mux-control-cells'
additionalProperties: false
examples:
- |
/* The parent device of mux controller is not a syscon device. */
#include <dt-bindings/mux/mux.h>
mux-controller {
compatible = "reg-mux";
#mux-control-cells = <
1>;
mux-reg-masks =
<
0x54
0xf8>, /*
0: reg
0x54, bits
7:
3 */
<
0x54
0x07>; /*
1: reg
0x54, bits
2:
0 */
};
mdio-mux-
1 {
compatible = "mdio-mux-multiplexer";
mux-controls = <&mux1
0>;
mdio-parent-bus = <&emdio1>;
#address-cells = <
1>;
#size-cells = <
0>;
mdio@
0 {
reg = <
0x0>;
#address-cells = <
1>;
#size-cells = <
0>;
};
mdio@
8 {
reg = <
0x8>;
#address-cells = <
1>;
#size-cells = <
0>;
};
};
mdio-mux-
2 {
compatible = "mdio-mux-multiplexer";
mux-controls = <&mux1
1>;
mdio-parent-bus = <&emdio2>;
#address-cells = <
1>;
#size-cells = <
0>;
mdio@
0 {
reg = <
0x0>;
#address-cells = <
1>;
#size-cells = <
0>;
};
mdio@
1 {
reg = <
0x1>;
#address-cells = <
1>;
#size-cells = <
0>;
};
};
- |
/* The parent device of mux controller is syscon device. */
#include <dt-bindings/mux/mux.h>
syscon@
1000 {
reg = <
0x1000
0x100>;
mux2: mux-controller {
compatible = "mmio-mux";
#mux-control-cells = <
1>;
mux-reg-masks =
<
0x3
0x30>, /*
0: reg
0x3, bits
5:
4 */
<
0x3
0x40>; /*
1: reg
0x3, bit
6 */
idle-states = <MUX_IDLE_AS_IS>, <
0>;
};
};
video-mux {
compatible = "video-mux";
mux-controls = <&mux2
0>;
#address-cells = <
1>;
#size-cells = <
0>;
ports {
#address-cells = <
1>;
#size-cells = <
0>;
/* inputs
0..
3 */
port@
0 {
reg = <
0>;
};
port@
1 {
reg = <
1>;
};
port@
2 {
reg = <
2>;
};
port@
3 {
reg = <
3>;
};
/* output */
port@
4 {
reg = <
4>;
};
};
};
...