linux-kernel - Re: [RFC PATCH 3/5] HACK: ASoC: Tolerate N-cpus-to-M-codecs links

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Date:   Mon, 4 Apr 2022 13:28:28 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Martin Povišer <povik+lin@...ebit.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Kettenis <kettenis@...nbsd.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>
Subject: Re: [RFC PATCH 3/5] HACK: ASoC: Tolerate N-cpus-to-M-codecs links

On Thu, Mar 31, 2022 at 02:04:47AM +0200, Martin Povišer wrote:

> +#if 0
>  				dev_err(rtd->card->dev,
>  					"N cpus to M codecs link is not supported yet\n");
>  				return -EINVAL;
> +#endif
> +				cpu_dai = asoc_rtd_to_cpu(rtd, 0);

We need to figure out an interface for describing which CODEC/CPU
combinations are connected to each other.  I'm not seeing a great way to
do that right now, probably some side data table is going to be needed,
or perhaps the CPU DAI drivers can be persuaded to only have one DAI
actually register and claim to support more channels?  I'm not sure how
a configuraiton like this is going to work at userspace level if the
multiple CPU DAIs end up being visible...

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