From: Mark Brown <broonie@kernel.org>
To: Judy Hsiao <judyhsiao@chromium.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
Douglas Anderson <dianders@chromium.org>,
Dylan Reid <dgreid@chromium.org>,
Jimmy Cheng-Yi Chiang <cychiang@google.com>,
Judy Hsiao <judyhsiao@google.com>,
Tzung-Bi Shih <tzungbi@chromium.org>,
Stephen Boyd <swboyd@chromium.org>,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
alsa-devel@alsa-project.org
Subject: Re: [PATCH] ASoC: snd-soc-dummy: add Device Tree support
Date: Tue, 22 Jun 2021 17:23:07 +0100 [thread overview]
Message-ID: <20210622162307.GF4574@sirena.org.uk> (raw)
In-Reply-To: <CAJXt+b-eRLKORqPOX1cJM3xzEyJhdeuj+w9-btpZSmy7v4U6Sw@mail.gmail.com>
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On Wed, Jun 23, 2021 at 12:10:53AM +0800, Judy Hsiao wrote:
> Thanks for your review comment.
> This patch is used to support multi-channel where we want one codec to
> control the only GPIO shared by 4 amps.
So you've got 4 instances of the same CODEC? Then I'd expect to see
those all individually represented in DT. Or if there's a single
physical CODEC then I'm not sure what the dummies are for?
> In snd_soc_runtime_calc_hw(), by creating dummy codecs that share a
> DAI link with a real codec:
> 1. The min/ max channel of CPU DAI will be directly adopted.
> 2. The formats and sample rates of the DAI link will be determined
> by the real codec unless the real codec supports the rate
> and format that do not intersect with the rate and format of
> snd-soc-dummy.
> That is the reason why we don’t specify the format and sample rates of
> the dummy codec with the real codec determining the properties .
It's not clear to me why you'd not just describe the actual CODECs here
rather than using a dummy CODEC, the fact that the dummy CODEC is doing
what you want is just an accident of the implementation rather than a
description of the hardware.
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next prev parent reply other threads:[~2021-06-22 16:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-21 7:41 [PATCH] ASoC: snd-soc-dummy: add Device Tree support Judy Hsiao
2021-06-21 11:45 ` Mark Brown
2021-06-22 16:10 ` Judy Hsiao
2021-06-22 16:23 ` Mark Brown [this message]
2021-06-23 14:29 ` Judy Hsiao
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