Documentation/devicetree/bindings/input/ti,nspire-keypad.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/input/ti,nspire-keypad.yaml

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/input/ti,nspire-keypad.yaml
Extension
.yaml
Size
1569 bytes
Lines
75
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/ti,nspire-keypad.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: TI-NSPIRE Keypad

maintainers:
  - Andrew Davis <afd@ti.com>

allOf:
  - $ref: input.yaml#
  - $ref: matrix-keymap.yaml#

properties:
  compatible:
    enum:
      - ti,nspire-keypad

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clocks:
    maxItems: 1

  scan-interval:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: How often to scan in us. Based on a APB speed of 33MHz, the
      maximum and minimum delay time is ~2000us and ~500us respectively

  row-delay:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: How long to wait between scanning each row in us.

  active-low:
    description: Specify that the keypad is active low.

required:
  - compatible
  - reg
  - interrupts
  - clocks
  - scan-interval
  - row-delay
  - linux,keymap

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/input/input.h>
    keypad@900e0000 {
        compatible = "ti,nspire-keypad";
        reg = <0x900e0000 0x1000>;
        interrupts = <16>;

        clocks = <&apb_pclk>;

        scan-interval = <1000>;
        row-delay = <200>;

        linux,keymap = <
            MATRIX_KEY(0,  0, KEY_ENTER)
            MATRIX_KEY(0,  1, KEY_ENTER)
            MATRIX_KEY(0,  4, KEY_SPACE)
            MATRIX_KEY(0,  5, KEY_Z)

Annotation

Implementation Notes