linux-kernel - Re: [ PATCH v2 3/3] ASoC: dt-bindings: Add support for Loongson audio card

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Date:   Tue, 13 Jun 2023 20:38:59 +0800
From:   Yingkun Meng <mengyingkun@...ngson.cn>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Conor Dooley <conor@...nel.org>, krzysztof.kozlowski+dt@...aro.org,
        robh+dt@...nel.org, conor+dt@...nel.org, broonie@...nel.org,
        lgirdwood@...il.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        loongarch@...ts.linux.dev, loongson-kernel@...ts.loongnix.cn
Subject: Re: [ PATCH v2 3/3] ASoC: dt-bindings: Add support for Loongson audio
 card


On 2023/6/13 20:28, Conor Dooley wrote:
> On Tue, Jun 13, 2023 at 08:23:58PM +0800, Yingkun Meng wrote:
>> On 2023/6/13 01:24, Conor Dooley wrote:
>>> Hey!
>>>
>>> On Mon, Jun 12, 2023 at 04:56:14PM +0800, YingKun Meng wrote:
>>>> From: Yingkun Meng <mengyingkun@...ngson.cn>
>>>>
>>>> The audio card uses loongson I2S controller present in
>>>> 7axxx/2kxxx chips to transfer audio data.
>>>>
>>>> On loongson platform, the chip has only one I2S controller.
>>>>
>>>> Signed-off-by: Yingkun Meng <mengyingkun@...ngson.cn>
>>> I got 2 copies of this patch, but none of the rest of the series appears
>>> to be threaded with it.
>>>
>>>>    .../sound/loongson,ls-audio-card.yaml         | 70 +++++++++++++++++++
>>>>    1 file changed, 70 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/sound/loongson,ls-audio-card.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/sound/loongson,ls-audio-card.yaml b/Documentation/devicetree/bindings/sound/loongson,ls-audio-card.yaml
>>>> new file mode 100644
>>>> index 000000000000..61e8babed402
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/sound/loongson,ls-audio-card.yaml
>>>> @@ -0,0 +1,70 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/sound/loongson,ls-audio-card.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Loongson 7axxx/2kxxx ASoC audio sound card driver
>>>> +
>>>> +maintainers:
>>>> +  - Yingkun Meng <mengyingkun@...ngson.cn>
>>>> +
>>>> +description:
>>>> +  The binding describes the sound card present in loongson
>>>> +  7axxx/2kxxx platform. The sound card is an ASoC component
>>>> +  which uses Loongson I2S controller to transfer the audio data.
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    const: loongson,ls-audio-card
>>> Reviewing sound stuff is beyond my pay grade, so forgive me if I am off
>>> the rails here, but this (and the "x"s in the description) look a bit
>>> odd. Recently, we've noticed quite a few loongson dt-bindings attempting
>>> to use a single compatible for many different chips.
>>> Usually you have individual compatibles for the various SoCs with this
>>> core, which can fall back to a generic one, rather than just adding a
>>> generic compatible for all devices.
>>> As far as I know, there's several SoCs fitting 2kxxx, and the format
>>> being used elsewhere is "loongson,ls2k1000" etc.
>>
>> Currently, Loongson has 2K0500/2K1000LA/2K1500/2K2000 chips.
>>
>> Here, its' possible to use a single compatible for different chips,
>>
>> as the audio device is a logical device, not dependent on chip model.
> What, may I ask, is a "logical device"?


I means it's not a physical one, like "platform bus".