Documentation/devicetree/bindings/sound/ti,j721e-cpb-audio.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/sound/ti,j721e-cpb-audio.yaml

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System
Linux kernel
Corpus path
Documentation/devicetree/bindings/sound/ti,j721e-cpb-audio.yaml
Extension
.yaml
Size
4134 bytes
Lines
140
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

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

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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
# Copyright (C) 2020 Texas Instruments Incorporated
# Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
%YAML 1.2
---
$id: http://devicetree.org/schemas/sound/ti,j721e-cpb-audio.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Texas Instruments J721e Common Processor Board Audio Support

maintainers:
  - Peter Ujfalusi <peter.ujfalusi@gmail.com>

description: |
  The audio support on the board is using pcm3168a codec connected to McASP10
  serializers in parallel setup.
  The pcm3168a SCKI clock is sourced from j721e AUDIO_REFCLK2 pin.
  In order to support 48KHz and 44.1KHz family of sampling rates the parent
  clock for AUDIO_REFCLK2 needs to be changed between PLL4 (for 48KHz) and
  PLL15 (for 44.1KHz). The same PLLs are used for McASP10's AUXCLK clock via
  different HSDIVIDER.

  Clocking setup for j721e:
    48KHz family:
    PLL4 ---> PLL4_HSDIV0 ---> MCASP10_AUXCLK ---> McASP10.auxclk
          |-> PLL4_HSDIV2 ---> AUDIO_REFCLK2  ---> pcm3168a.SCKI

    44.1KHz family:
    PLL15 ---> PLL15_HSDIV0 ---> MCASP10_AUXCLK ---> McASP10.auxclk
           |-> PLL15_HSDIV2 ---> AUDIO_REFCLK2  ---> pcm3168a.SCKI

  Clocking setup for j7200:
    48KHz family:
    PLL4 ---> PLL4_HSDIV0 ---> MCASP0_AUXCLK ---> McASP0.auxclk
          |-> PLL4_HSDIV2 ---> AUDIO_REFCLK2  ---> pcm3168a.SCKI

properties:
  compatible:
    enum:
      - ti,j721e-cpb-audio
      - ti,j7200-cpb-audio

  model:
    $ref: /schemas/types.yaml#/definitions/string
    description: User specified audio sound card name

  ti,cpb-mcasp:
    description: phandle to McASP used on CPB
    $ref: /schemas/types.yaml#/definitions/phandle

  ti,cpb-codec:
    description: phandle to the pcm3168a codec used on the CPB
    $ref: /schemas/types.yaml#/definitions/phandle

  clocks:
    minItems: 4
    maxItems: 6

  clock-names:
    minItems: 4
    maxItems: 6

required:
  - compatible
  - model
  - ti,cpb-mcasp
  - ti,cpb-codec
  - clocks
  - clock-names

Annotation

Implementation Notes