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Message-ID: <77509c18-a4a8-4803-8370-cdcaa175ada1@baylibre.com>
Date: Wed, 28 Feb 2024 10:18:38 +0100
From: Alexandre Mergnat <amergnat@...libre.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
<matthias.bgg@...il.com>, Lee Jones <lee@...nel.org>,
Flora Fu <flora.fu@...iatek.com>, Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>, Sumit Semwal <sumit.semwal@...aro.org>,
Christian König <christian.koenig@....com>,
Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
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-media@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH 02/18] ASoC: dt-bindings: mediatek,mt8365-mt6357: Add
audio sound card document
On 27/02/2024 13:38, AngeloGioacchino Del Regno wrote:
> Il 27/02/24 11:23, Alexandre Mergnat ha scritto:
>>
>>
>> On 26/02/2024 16:30, AngeloGioacchino Del Regno wrote:
>>> Il 26/02/24 15:01, Alexandre Mergnat ha scritto:
>>>> Add soundcard bindings for the MT8365 SoC with the MT6357 audio codec.
>>>>
>>>> Signed-off-by: Alexandre Mergnat <amergnat@...libre.com>
>>>> ---
>>>> .../bindings/sound/mediatek,mt8365-mt6357.yaml | 127
>>>> +++++++++++++++++++++
>>>> 1 file changed, 127 insertions(+)
>>>>
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/sound/mediatek,mt8365-mt6357.yaml b/Documentation/devicetree/bindings/sound/mediatek,mt8365-mt6357.yaml
>>>> new file mode 100644
>>>> index 000000000000..f469611ec6b6
>>>> --- /dev/null
>>>> +++
>>>> b/Documentation/devicetree/bindings/sound/mediatek,mt8365-mt6357.yaml
>>>> @@ -0,0 +1,127 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/sound/mediatek,mt8365-mt6357.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Mediatek MT8365 sound card with MT6357 sound codec.
>>>> +
>>>> +maintainers:
>>>> + - Alexandre Mergnat <amergnat@...libre.com>
>>>> +
>>>> +description:
>>>> + This binding describes the MT8365 sound card.
>>>> +
>>>> +properties:
>>>> + compatible:
>>>> + const: mediatek,mt8365-mt6357
>>>> +
>>>> + mediatek,hp-pull-down:
>>>> + description:
>>>> + Earphone driver positive output stage short to the
>>>> + audio reference ground.
>>>> + Default value is false.
>>>> + type: boolean
>>>> +
>>>> + mediatek,micbias0-microvolt:
>>>> + description: |
>>>
>>> description: Selects MIC Bias 0 output voltage
>>>
>>>> + Selects MIC Bias 0 output voltage.
>>>> + [1.7v, 1.8v, 1.9v, 2.0v, 2.1v, 2.5v, 2.6v, 2.7v]
>>>> + enum: [0, 1, 2, 3, 4, 5, 6, 7]
>>>
>>> No, you don't say 0 1 2 3 4 to a property that says "microvolt",
>>> that's simply
>>> wrong.
>>>
>>> mediatek,micbias0-microvolt = <2100000>;
>>>
>>> ...so you want a binding that says
>>> enum: [ 1700000, 1800000, this, that, 2700000]
>>>
>>
>> Is it correct if I put "description: Selects MIC Bias 0 output voltage
>> index" ?
>>
>
> No, it's still not correct. You have to pass microvolt values.
>
> The driver will then transform the microvolt values to the index and
> subsequently
> write the index value to the hardware registers.
>
> The bindings shall be generic, in the sense that they shall not express
> hardware
> register values... and this is especially true when we have a value that
> *does*
> actually have means to be expressed in common units.
>
> Besides, in the cases in which there's no common units involved, the
> values most
> probably won't be suited for devicetree//bindings, so those would be
> hardcoded in
> the driver as platform data.
>
> This is not the case, so, please keep this property but specify
> microvolts in the
> bindings (and obviously in devicetree).
Got it, thx !
>
>>>> +
>>>> + mediatek,micbias1-microvolt:
>>>> + description: |
>>>> + Selects MIC Bias 1 output voltage.
>>>> + [1.7v, 1.8v, 1.9v, 2.0v, 2.1v, 2.5v, 2.6v, 2.7v]
>>>> + enum: [0, 1, 2, 3, 4, 5, 6, 7]
>>>
>>> same here.
>>>
>>>> +
>>>> + mediatek,platform:
>>>> + $ref: /schemas/types.yaml#/definitions/phandle
>>>> + description: The phandle of MT8365 ASoC platform.
>>>> +
>>>> + pinctrl-names:
>>>> + minItems: 1
>>>> + items:
>>>> + - const: aud_default
>>>> + - const: aud_dmic
>>>> + - const: aud_miso_off
>>>> + - const: aud_miso_on
>>>> + - const: aud_mosi_off
>>>> + - const: aud_mosi_on
>>>> +
>>>> + vaud28-supply:
>>>> + description:
>>>> + 2.8 volt supply for the audio codec
>>>> +
>>>> +patternProperties:
>>>> + "^dai-link-[0-9]+$":
>>>> + type: object
>>>> + description:
>>>> + Container for dai-link level properties and CODEC sub-nodes.
>>>> +
>>>> + properties:
>>>> + codec:
>>>> + type: object
>>>> + description: Holds subnode which indicates codec dai.
>>>> +
>>>> + properties:
>>>> + sound-dai:
>>>> + maxItems: 1
>>>> + description: phandle of the codec DAI
>>>> +
>>>> + additionalProperties: false
>>>> +
>>>> + link-name:
>>>> + description:
>>>> + This property corresponds to the name of the BE dai-link
>>>> to which
>>>> + we are going to update parameters in this node.
>>>> + items:
>>>> + const: 2ND I2S BE
>>>> +
>>>> + sound-dai:
>>>> + maxItems: 1
>>>> + description: phandle of the CPU DAI
>>>> +
>>>> + additionalProperties: false
>>>> +
>>>> + required:
>>>> + - link-name
>>>> + - sound-dai
>>>> +
>>>> +additionalProperties: false
>>>> +
>>>> +required:
>>>> + - compatible
>>>> + - mediatek,platform
>>>> + - pinctrl-names
>>>> + - vaud28-supply
>>>> +
>>>> +examples:
>>>> + - |
>>>> + sound {
>>>> + compatible = "mediatek,mt8365-mt6357";
>>>> + mediatek,platform = <&afe>;
>>>
>>> Please:
>>>
>>> https://docs.kernel.org/devicetree/bindings/dts-coding-style.html
>>
>> Is it about the wrong pinctrl-names tab alignment ?
>> Also, 2ND I2S BE => 2ND_I2S_BE ?
>> Otherwise, I don't get it sorry.
>>
>
> ...as Krzysztof already clarified, won't repeat :-P
Yes it is, I will fix that.
>
> Cheers!
>
>>>
>>> Regards,
>>> Angelo
>>>
>>>> + pinctrl-names = "aud_default",
>>>> + "aud_dmic",
>>>> + "aud_miso_off",
>>>> + "aud_miso_on",
>>>> + "aud_mosi_off",
>>>> + "aud_mosi_on";
>>>> + pinctrl-0 = <&aud_default_pins>;
>>>> + pinctrl-1 = <&aud_dmic_pins>;
>>>> + pinctrl-2 = <&aud_miso_off_pins>;
>>>> + pinctrl-3 = <&aud_miso_on_pins>;
>>>> + pinctrl-4 = <&aud_mosi_off_pins>;
>>>> + pinctrl-5 = <&aud_mosi_on_pins>;
>>>> + vaud28-supply = <&mt6357_vaud28_reg>;
>>>> +
>>>> + /* hdmi interface */
>>>> + dai-link-0 {
>>>> + sound-dai = <&afe>;
>>>> + link-name = "2ND I2S BE";
>>>> +
>>>> + codec {
>>>> + sound-dai = <&it66121hdmitx>;
>>>> + };
>>>> + };
>>>> + };
>>>>
>>>
>>
>
>
--
Regards,
Alexandre
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