linux-kernel - Re: [PATCH v2 09/11] ASoC: dt-bindings: mediatek,mt8196-afe: add audio AFE document

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Message-ID: <d26b9775-0f85-48a7-ba52-093484ada382@kernel.org>
Date: Mon, 7 Apr 2025 15:09:53 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "Darren.Ye" <darren.ye@...iatek.com>, Liam Girdwood
 <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 09/11] ASoC: dt-bindings: mediatek,mt8196-afe: add
 audio AFE document

On 07/04/2025 14:06, Darren.Ye wrote:
> From: Darren Ye <darren.ye@...iatek.com>
> 
> Add mt8196 audio AFE document.
> 
> Signed-off-by: Darren Ye <darren.ye@...iatek.com>
> ---
>  .../bindings/sound/mediatek,mt8196-afe.yaml   | 233 ++++++++++++++++++

Bindings are before their users. Order your patches correctly (see DT
submitting patches).

>  1 file changed, 233 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/mediatek,mt8196-afe.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/mediatek,mt8196-afe.yaml b/Documentation/devicetree/bindings/sound/mediatek,mt8196-afe.yaml
> new file mode 100644
> index 000000000000..44f8847b13a8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/mediatek,mt8196-afe.yaml

Filename matching compatible.


> @@ -0,0 +1,233 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/mediatek,mt8196-afe.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Audio Front End PCM controller for MT8196
> +
> +maintainers:
> +  - Darren Ye <darren.ye@...iatek.com>
> +
> +properties:
> +  compatible:
> +    const: mediatek,mt8196-afe-pcm
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1

Blank line

> +  memory-region:
> +    maxItems: 1
> +    description: |
> +      Shared memory region for AFE memif.  A "shared-dma-pool".
> +      See dtschema reserved-memory/shared-dma-pool.yaml for details.

Drop description

Blank line

> +  mediatek,cksys:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: The phandle of the mediatek clk systemd controller

For what purpose? this should be answered here. Anyway you clocks for
handling clocks of clk controller.

> +
> +  mediatek,vlpcksys:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: The phandle of the mediatek vlpcksys controller

Blank line. For what purpose?

> +  power-domains:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: audio hopping clock gate
> +      - description: audio f26m clock gate
> +      - description: audio apll1 clock gate
> +      - description: audio apll2 clock gate
> +      - description: audio apll1 tuner gate
> +      - description: audio apll2 tuner gate
> +      - description: mux for audio vlp int
> +      - description: mux for audio vlp engen1
> +      - description: mux for audio vlp engen2
> +      - description: mux for audio h
> +      - description: vlp clock 26m
> +      - description: audio mainpll divide 4
> +      - description: mux for audio apll1
> +      - description: audio apll1
> +      - description: mux for audio apll2
> +      - description: audio apll2
> +      - description: audio apll1 divide 4
> +      - description: audio apll2 divide 4
> +      - description: mux for i2sin0 mck
> +      - description: mux for i2sin1 mck
> +      - description: mux for fmi2s mck
> +      - description: mux for tdmout mck
> +      - description: auido apll12 divide for i2sin0
> +      - description: auido apll12 divide for i2sin1
> +      - description: auido apll12 divide for fmi2s
> +      - description: auido apll12 divide for tdmout mck
> +      - description: auido apll12 divide for tdmout bck
> +      - description: audio adsp clk
> +      - description: 26m clock

Do not come with entirely different ordering than existing variants.

> +
> +  clock-names:
> +    items:
> +      - const: aud_hopping_clk

Look how this is called in upstream.

> +      - const: aud_f26m_clk
> +      - const: aud_apll1_clk
> +      - const: aud_apll2_clk
> +      - const: aud_apll_tuner1_clk
> +      - const: aud_apll_tuner2_clk
> +      - const: vlp_mux_audio_int
> +      - const: vlp_mux_aud_eng1
> +      - const: vlp_mux_aud_eng2
> +      - const: vlp_mux_audio_h
> +      - const: vlp_clk26m_clk
> +      - const: ck_mainpll_d4_d4
> +      - const: ck_mux_aud_1
> +      - const: ck_apll1_ck
> +      - const: ck_mux_aud_2
> +      - const: ck_apll2_ck
> +      - const: ck_apll1_d4
> +      - const: ck_apll2_d4
> +      - const: ck_i2sin0_m_sel
> +      - const: ck_i2sin1_m_sel
> +      - const: ck_fmi2s_m_sel
> +      - const: ck_tdmout_m_sel
> +      - const: ck_apll12_div_i2sin0
> +      - const: ck_apll12_div_i2sin1
> +      - const: ck_apll12_div_fmi2s
> +      - const: ck_apll12_div_tdmout_m
> +      - const: ck_apll12_div_tdmout_b
> +      - const: ck_adsp_sel
> +      - const: ck_clk26m_clk

The same.

> +
> +  mediatek,etdm4-out-ch:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Number of ETDM4 output channels.
> +    minimum: 1
> +    maximum: 8
> +
> +  mediatek,etdm4-in-ch:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Number of ETDM4 input channels.
> +    minimum: 1
> +    maximum: 8

Why is this binding so different than existing ones? I expect uniformity
not rework of all properties every time you upstream new device.

> +
> +  mediatek,etdm4-out-sync:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      ETDM4 output and input enable synchronization.
> +    enum:
> +      - 0 # Enable controlled by itself
> +      - 1 # Enable synchronization with ETDM4 input.
> +
> +  mediatek,etdm4-in-sync:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      ETDM4 input and outpuot enable synchronization.
> +    enum:
> +      - 0 # Enable controlled by itself
> +      - 1 # Enable synchronization with ETDM4 output.
> +
> +
> +

Hm? But why? One blank line is enough.

> +  mediatek,etdm4-ip-mode:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: ETDM IP mode.
> +    enum:
> +      - 0 # One ip multi-ch mode
> +      - 1 # Multi-ip 2ch mode
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - mediatek,cksys
> +  - mediatek,vlpcksys
> +  - power-domains
> +  - memory-region
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        afe: mt8196-afe-pcm@...10000 {

Look at other bindings.

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


Best regards,
Krzysztof