linux-kernel - Re: [alsa-devel] [linux-sunxi] Re: [PATCH v2 6/6] ASoC: sun4i-i2s: Add support for loopback

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Message-ID: <20180313162642.GR2186@sirena.org.uk>
Date:   Tue, 13 Mar 2018 09:26:42 -0700
From:   Mark Brown <broonie@...nel.org>
To:     Chris Obbard <chris@...tudio.com>
Cc:     alsa-devel@...a-project.org, be17068@...rbole.bo.it,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        lgirdwood@...il.com, Code Kipper <codekipper@...il.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [linux-sunxi] Re: [PATCH v2 6/6] ASoC: sun4i-i2s:
 Add support for loopback

On Tue, Mar 13, 2018 at 01:39:44PM +0000, Chris Obbard wrote:
> >> +- loopback:  if this property is present then the dai is configured in
> >> +             loopback mode where the output fifo is redirected to the input
> >> +             fifo.

> > This really doesn't seem like something that ought to go into the DT
> > and hence ABI given that there's obviously no reason to use this in
> > production.  Just make it be a #define in the code or something.

> It would be nice to have this as an optional devicetree property so
> when testing JACK latency etc I don't have to manually re-compile a
> kernel...

You'll have to rebuild your DT anyway, I'm not sure the kernel is that
much of a difference...  For your use case you'd want a regular runtime
ALSA control, not a DT property anyway.  That would be fine.

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