linux-kernel - Audio sound card name [was [PATCH 4/7] arm64: dts: allwinner: a64: Add HDMI audio]

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Date:   Tue, 28 Apr 2020 18:49:10 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Maxime Ripard <maxime@...no.tech>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Marcus Cooper <codekipper@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Audio sound card name [was [PATCH 4/7] arm64: dts: allwinner: a64:
 Add HDMI audio]

Hi Mark, Rob,

On Tue, 28 Apr 2020 at 18:04, Maxime Ripard <maxime@...no.tech> wrote:
>
> On Tue, Apr 28, 2020 at 10:54:00AM +0200, Clément Péron wrote:
> > Hi Maxime,
> >
> > On Tue, 28 Apr 2020 at 10:00, Maxime Ripard <maxime@...no.tech> wrote:
> > >
> > > On Sun, Apr 26, 2020 at 02:04:39PM +0200, Clément Péron wrote:
> > > > From: Marcus Cooper <codekipper@...il.com>
> > > >
> > > > Add a simple-soundcard to link audio between HDMI and I2S.
> > > >
> > > > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> > > > Signed-off-by: Marcus Cooper <codekipper@...il.com>
> > > > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > > > ---
> > > >  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 21 +++++++++++++++++++
> > > >  1 file changed, 21 insertions(+)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > > > index e56e1e3d4b73..08ab6b5e72a5 100644
> > > > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > > > @@ -102,6 +102,25 @@
> > > >               status = "disabled";
> > > >       };
> > > >
> > > > +     hdmi_sound: hdmi-sound {
> > > > +             compatible = "simple-audio-card";
> > > > +             simple-audio-card,format = "i2s";
> > > > +             simple-audio-card,name = "allwinner,hdmi";
> > >
> > > I'm not sure what the usual card name should be like though. I would assume that
> > > this should be something specific enough so that you're able to differentiate
> > > between boards / SoC so that the userspace can choose a different configuration
> > > based on it?
> >
> > I really don't know what we should use here,
> > I just have a look at other SoC:
> > rk3328: "HDMI"
> > rk3399: "hdmi-sound"
> > r8a774c0-cat874: "CAT874 HDMI sound"
> >
> > But maybe it's time to introduce proper name:
> > What about :
> > pat
> > sun50i-h6-hdmi
>
> It's pretty much what we've been using for the other sound cards we have, so it
> makes sense to me.

I have a question regarding the simple-audio-card,name.
In this patch, I would like to introduce a simple-audio-card for the
Allwinner A64 HDMI.

What should be the preferred name for this sound card?
"sun50i-a64-hdmi" ? "allwinner, sun50i-a64-hdmi" ?

Thanks for your tips,
Clement

>
> > How should we handle this with h3 / h5 ?
> > settings the simple-audio-card,name in each SoC dts?
> > Or using sun50i-h3-hdmi as they are both identical?
>
> Yeah, we can do the latter
>
> Maxime