linux-kernel - Re: [PATCH 1/2] dt-bindings: sound: ep93xx: Add I2S and AC'97 descriptions

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Message-ID: <46d5b6af-23e1-4178-83bc-b4a435b1426e@linaro.org>
Date:   Tue, 14 Feb 2023 11:58:11 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        devicetree@...r.kernel.org
Cc:     Hartley Sweeten <hsweeten@...ionengravers.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: sound: ep93xx: Add I2S and AC'97
 descriptions

On 13/02/2023 00:21, Alexander Sverdlin wrote:
> Add device tree bindings for Cirrus Logic EP93xx internal SoCs' I2S and
> AC'97 controllers.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
> ---
>  .../bindings/sound/cirrus,ep9301-ac97.yaml    | 47 ++++++++++++++
>  .../bindings/sound/cirrus,ep9301-i2s.yaml     | 63 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  3 files changed, 111 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/cirrus,ep9301-ac97.yaml
>  create mode 100644 Documentation/devicetree/bindings/sound/cirrus,ep9301-i2s.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/cirrus,ep9301-ac97.yaml b/Documentation/devicetree/bindings/sound/cirrus,ep9301-ac97.yaml
> new file mode 100644
> index 000000000000..bfa5d392f525
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/cirrus,ep9301-ac97.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/cirrus,ep9301-ac97.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cirrus EP93xx AC'97 Controller
> +
> +description: |
> +  The AC’97 Controller includes a 5-pin serial interface to an external audio
> +  codec.
> +
> +maintainers:
> +  - Alexander Sverdlin <alexander.sverdlin@...il.com>
> +

missing ref to dai-common.yaml

> +properties:
> +  compatible:
> +    const: cirrus,ep9301-ac97
> +
(...)

> diff --git a/Documentation/devicetree/bindings/sound/cirrus,ep9301-i2s.yaml b/Documentation/devicetree/bindings/sound/cirrus,ep9301-i2s.yaml
> new file mode 100644
> index 000000000000..b47d28dc8389
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/cirrus,ep9301-i2s.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/cirrus,ep9301-i2s.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cirrus EP93xx I2S Controller
> +
> +description: |
> +  The I2S controller is used to stream serial audio data between the external
> +  I2S CODECs’, ADCs/DACs, and the ARM Core. The controller supports I2S, Left-
> +  and Right-Justified DSP formats.
> +
> +maintainers:
> +  - Alexander Sverdlin <alexander.sverdlin@...il.com>
> +

ref to dai-common

> +properties:
> +  compatible:
> +    const: cirrus,ep9301-i2s
> +
> +  '#sound-dai-cells':
> +    const: 0
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 3

maxItems instead

> +
> +  clock-names:
> +    items:
> +      - const: mclk
> +      - const: sclk
> +      - const: lrclk


The clk suffixes are quite redundant. Don't these inputs have some
meaningful name?

> +
> +required:
> +  - compatible
> +  - '#sound-dai-cells'
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2s: i2s@...20000 {
> +        compatible = "cirrus,ep9301-i2s";
> +        #sound-dai-cells = <0>;
> +        reg = <0x80820000 0x100>;
> +        interrupt-parent = <&vic1>;
> +        interrupts = <28>;
> +        clocks = <&syscon 29
> +                  &syscon 30
> +                  &syscon 31>;

That's one phandle, but you want three, so <>, <>, <>.


Best regards,
Krzysztof