linux-kernel - RE: [PATCH] ASoC: brcm: Add DSL/PON SoC audio driver

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Message-ID: <8113837129a1b41aee674c68258cd37f@mail.gmail.com>
Date:   Mon, 9 Mar 2020 11:14:18 -0700
From:   Kevin Li <kevin-ke.li@...adcom.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Takashi Iwai <tiwai@...e.com>, Liam Girdwood <lgirdwood@...il.com>,
        Ray Jui <rjui@...adcom.com>, Jaroslav Kysela <perex@...ex.cz>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Stephen Boyd <swboyd@...omium.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: RE: [PATCH] ASoC: brcm: Add DSL/PON SoC audio driver

I can't really parse what you're talking about here (perhaps some of that
context would have helped...) but it doesn't seem to be the clocking of
the I2S bus which would normally be what master and slave would be talking
about.

It is the clock setting of I2S bus master or slave.
If I am playing music only, I set TX as master. All others are slave.
If I am recording only. I set RX as master. All others are slave.
If I am playing and recording at same time, I set first coming stream as
master second coming stream as slave. If I shut down first stream before
second stream, then I will set the second stream as master, otherwise
there will be no clock/FS signal on the I2S bus to maintain the second
stream to its end.
Hope it is clearer.