linux-kernel - Re: [PATCH v2 15/18] dt-bindings: sound: Add bindings for Cirrus Logic Madera codecs

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Date:   Tue, 25 Apr 2017 17:27:44 +0100
From:   Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:     Mark Brown <broonie@...nel.org>
CC:     <lee.jones@...aro.org>, <linus.walleij@...aro.org>,
        <gnurou@...il.com>, <robh+dt@...nel.org>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <alsa-devel@...a-project.org>,
        <patches@...nsource.wolfsonmicro.com>,
        <linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 15/18] dt-bindings: sound: Add bindings for Cirrus
 Logic Madera codecs

On Tue, 2017-04-25 at 16:52 +0100, Mark Brown wrote:
> On Mon, Apr 24, 2017 at 05:08:41PM +0100, Richard Fitzgerald wrote:
> > The Cirrus Logic Madera codecs are a family of related codecs with
> > extensive digital and analogue I/O, digital mixing and routing,
> > signal processing and programmable DSPs.
> 
> Please submit patches using subject lines reflecting the style for the
> subsystem.  This makes it easier for people to identify relevant
> patches.  Look at what existing commits in the area you're changing are
> doing and make sure your subject lines visually resemble what they're
> doing.
> 
> > +Required properties:
> > +  - compatible : One of the following chip-specific strings:
> > +        "cirrus,cs47l35-codec"
> > +        "cirrus,cs47l85-codec"
> > +        "cirrus,cs47l90-codec"
> 
> You shouldn't have compatible strings for subfunctions of a MFD unless
> these represent meaningful reusable IPs that can exist separately from
> the parent chip, that's clearly not the case here.  All you're doing
> here is encoding Linux internal abstractions which aren't OS neutral and
> might change in future (for example clocking might move more into the
> clock API).

While that's nice, the of_node doesn't get populated if there isn't a
compatible string. And people don't like workarounds for the missing
of_node.