linux-kernel - Re: [PATCH 1/4] dt-bindings: sound: sun4i-spdif: Add Allwinner H6 compatible

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Message-ID: <20190416073449.qzl3uyjgvjgd3tai@flea>
Date:   Tue, 16 Apr 2019 09:34:49 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Icenowy Zheng <icenowy@...c.io>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 1/4] dt-bindings: sound: sun4i-spdif: Add Allwinner H6
 compatible

On Mon, Apr 15, 2019 at 06:30:10PM +0200, Clément Péron wrote:
> > > I didn't change the driver and the SPDIF is working what's irrelevant
> > > in declaring the driver as compatible ?
> >
> > It's working by accident.
> >
> > This won't work for example:
> > https://elixir.bootlin.com/linux/latest/source/sound/soc/sunxi/sun4i-spdif.c#L181
> >
> > > If some feature are missing they can be introduce later as there is a
> > > special binding for H6 no ?
> >
> > Again, that's irrelevant. The only question you need to ask yourself
> > is whether, if you take an imaginary source code that would support
> > all the H3 SPDIF features and run it on an H6, it works just as well.
> >
> > The examples above that it's not the case, so you can't claim that the
> > device is compatible.
>
> Is it ok if I fix the TX Fifo flush bit and remove the compatible with H3 ?
> (Looking at the driver this is the only bit used that is incompatible with H6)

Sure

> Or should I send a new driver with the correct mapping ?

No, we definitely don't want to duplicate a driver just for a single
bit offset that changes.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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