Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Sun, 13 Aug 2023 18:25:42 +0100
From:   Mark Brown <broonie@kernel.org>
To:     Rob Herring <robh@kernel.org>
Cc:     Daniel Baluta <daniel.baluta@oss.nxp.com>,
        alsa-devel@alsa-project.org, kuninori.morimoto.gx@renesas.com,
        spujar@nvidia.com, tiwai@suse.com, perex@perex.cz,
        linux-kernel@vger.kernel.org, linux-imx@nxp.com,
        devicetree@vger.kernel.org, daniel.baluta@gmail.com
Subject: Re: [PATCH 2/2] ASoC: dt-bindings: simple-card: Document new DAI
 flags playback-only/capture-only
Message-ID: <ZNkSFvZkQgtudM5Z@finisterre.sirena.org.uk>
References: <20230801082433.548206-1-daniel.baluta@oss.nxp.com>
 <20230801082433.548206-3-daniel.baluta@oss.nxp.com>
 <20230811191236.GA3937407-robh@kernel.org>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha512;
        protocol="application/pgp-signature"; boundary="2MQbhxQeL2I8OcPf"
Content-Disposition: inline
In-Reply-To: <20230811191236.GA3937407-robh@kernel.org>
Precedence: bulk


--2MQbhxQeL2I8OcPf
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Fri, Aug 11, 2023 at 01:12:36PM -0600, Rob Herring wrote:
> On Tue, Aug 01, 2023 at 11:24:33AM +0300, Daniel Baluta wrote:

> > +  playback-only:
> > +    description: dai-link is used only for playback
> > +    $ref: /schemas/types.yaml#/definitions/flag

> > +  capture-only:
> > +    description: dai-link is used only for capture
> > +    $ref: /schemas/types.yaml#/definitions/flag

> Wouldn't this be implicit based on limitations in the either the cpu or=
=20
> codec DAI?

You can see cases where people just don't connect some of the signals
for whatever reason so even if the two devices could do bidrectional
audio the board can't, and there are also cases like the at91sam9g20ek
where the DAI is connected for bidrectional audio but there's not
actually any audio inputs you can connect (even loopbacks) for one of
the directions so it's best to just mask things out from the user.

--2MQbhxQeL2I8OcPf
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmTZEhUACgkQJNaLcl1U
h9AFoAf9GbJjlpdCljVFwIbGL4YEzDszN7Bqo2ShmBFc2t6+CJ3cFIZIe3xx0e/n
Brz83l9paS8ptdkksscqnvp8FsIK91gGI4o2UamvpF46DI3+t6yJ9AiNmtnC9JQx
WMVBqNK4gUmlLnvcwM6Esy3BBpHU4XkuOgacAyaOYc2r2Knztc1LQwgk3Kmm4KGx
FeESWRjTKDsFT1YjCOHgYEG4LRg5zoClyuL8O4DlzJ3suQwpjPogqoWVRexP/55A
QAD8JtPo190LjiOWsp1qxVkNba/KRPADOS4KqBeQM+YFmcOW92E30t+0wdLthv5W
Y5oiKJ0YF/0pprKQ+nTij4kxyPxokQ==
=yaLR
-----END PGP SIGNATURE-----

--2MQbhxQeL2I8OcPf--