linux-kernel - Re: [PATCH v1 1/2] ASoC: simple-card: Support custom DAI system clock IDs

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Message-ID: <87fsfem6zd.wl-kuninori.morimoto.gx@renesas.com>
Date:   Sun, 23 Oct 2022 23:54:14 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>
Cc:     broonie@...nel.org, lgirdwood@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] ASoC: simple-card: Support custom DAI system clock IDs


Hi Aidan

Thank you for your patch

> Some DAIs have multiple system clock sources, which can be chosen
> using the "clk_id" argument to snd_soc_dai_set_sysclk(). Currently
> this is hardcoded to 0 when using simple cards, but that choice is
> not always suitable.
> 
> Add the "system-clock-id" property to allow selecting a different
> clock ID on a per-DAI basis.
> 
> To simplify the logic on DPCM cards, add a dummy "asoc_simple_dai"
> instance and use that for the dummy components on DPCM links. This
> ensures that when we're iterating over DAIs in the PCM runtime there
> is always a matching "asoc_simple_dai" we can dereference.
> 
> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
> ---

I think adding "system-clock-id" and adding "dummy asoc_simple_dai" are
different topics. This patch should be separated into 2 patches.

And I couldn't understand the reason why we need to add dummy asoc_simple_dai.
In my understanding, we don't parse DT for dummy connection.
Which process are you talking about specifically here?

	This ensures that when we're iterating over DAIs in the PCM runtime there
	is always a matching "asoc_simple_dai" we can dereference.
- 
Thank you for your help !!

Best regards
---
Kuninori Morimoto