linux-kernel - Re: [PATCH v2 2/6] ASoC: dt-bindings: Document Microchip's PDMC

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Message-ID: <73c49f2b-ef2e-5ed8-f3d5-aa696f9af9e6@canonical.com>
Date:   Mon, 7 Mar 2022 12:18:24 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     lars@...afoo.de, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, robh+dt@...nel.org, nicolas.ferre@...rochip.com
Subject: Re: [PATCH v2 2/6] ASoC: dt-bindings: Document Microchip's PDMC

On 07/03/2022 11:04, Codrin Ciubotariu wrote:
> Add DT bindings for the new Microchip PDMC embedded in sama7g5 SoCs.
> 
> Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
> ---
> 
> Changes in v2:
>  - renamed patch from 'ASoC: add DT bindings for Microchip PDMC' to
>    'ASoC: dt-bindings: Document Microchip's PDMC';
>  - renamed yaml file from 'mchp,pdmc.yaml' to 'microchip,pdmc.yaml';
>  - used imperative mode in commit description;
>  - renamed mchp,pdmc.h to microchip,pdmc.h;
>  - fixed 'title' to represent HW;
>  - made 'compatible' first property;
>  - s/microhpone/microphone;
>  - none name in example set to 'sound';
> 
>  .../bindings/sound/microchip,pdmc.yaml        | 99 +++++++++++++++++++
>  include/dt-bindings/sound/microchip,pdmc.h    | 13 +++
>  2 files changed, 112 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/microchip,pdmc.yaml
>  create mode 100644 include/dt-bindings/sound/microchip,pdmc.h
> 
> diff --git a/Documentation/devicetree/bindings/sound/microchip,pdmc.yaml b/Documentation/devicetree/bindings/sound/microchip,pdmc.yaml
> new file mode 100644
> index 000000000000..edfa3cbd318e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/microchip,pdmc.yaml
> @@ -0,0 +1,99 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/microchip,pdmc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip Pulse Density Microphone Controller
> +
> +maintainers:
> +  - Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
> +
> +description:
> +  The Microchip Pulse Density Microphone Controller (PDMC) interfaces up to 4 digital microphones
> +  having Pulse Density Modulated (PDM) outputs.

This exceeds 80 characters.

> +
> +properties:
> +  compatible:
> +    const: microchip,sama7g5-pdmc
> +
> +  "#sound-dai-cells":
> +    const: 0
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Peripheral Bus Clock
> +      - description: Generic Clock
> +
> +  clock-names:
> +    items:
> +      - const: pclk
> +      - const: gclk
> +
> +  dmas:
> +    description: RX DMA Channel
> +    maxItems: 1
> +
> +  dma-names:
> +    const: rx
> +
> +  microchip,mic-pos:
> +    description: |
> +      Position of PDM microphones on the DS line and the sampling edge (rising or falling) of the
> +      CLK line. A microphone is represented as a pair of DS line and the sampling edge. The first
> +      microphone is mapped to channel 0, the second to channel 1, etc.

This is also too long, wrap at 80.

> +    $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +    items:
> +      items:
> +        - description: value for DS line
> +        - description: value for sampling edge
> +      anyOf:
> +        - enum:
> +            - [0, 0]
> +            - [0, 1]
> +            - [1, 0]
> +            - [1, 1]
> +    minItems: 1
> +    maxItems: 4
> +    uniqueItems: true
> +
> +required:
> +  - compatible
> +  - "#sound-dai-cells"
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - dmas
> +  - dma-names
> +  - microchip,mic-pos
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/at91.h>
> +    #include <dt-bindings/dma/at91.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/sound/microchip,pdmc.h>
> +
> +    pdmc: sound@...08000 {
> +        compatible = "microchip,sama7g5-pdmc";
> +        #sound-dai-cells = <0>;
> +        reg = <0xe1608000 0x4000>;

In DTS sources: compatible then reg. I mentioned it in previous version.

Best regards,
Krzysztof