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

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Date:   Tue, 13 Mar 2018 13:39:44 +0000
From:   Chris Obbard <chris@...tudio.com>
To:     broonie@...ena.org.uk
Cc:     Code Kipper <codekipper@...il.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        lgirdwood@...il.com, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, be17068@...rbole.bo.it
Subject: Re: [linux-sunxi] Re: [PATCH v2 6/6] ASoC: sun4i-i2s: Add support for loopback

Hi Mark,

>
>> +- 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...