linux-kernel - Re: [PATCH 3/4] ASoC: wm8904: extend device tree support

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Message-ID: <YrCOaW/K6muNnyRf@sirena.org.uk>
Date:   Mon, 20 Jun 2022 16:12:41 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Pierluigi Passaro <pierluigi.p@...iscite.com>
Cc:     Alifer Willians de Moraes <alifer.m@...iscite.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Eran Matityahu <eran.m@...iscite.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "nicoleotsuka@...il.com" <nicoleotsuka@...il.com>,
        "patches@...nsource.cirrus.com" <patches@...nsource.cirrus.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shengjiu.wang@...il.com" <shengjiu.wang@...il.com>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>
Subject: Re: [PATCH 3/4] ASoC: wm8904: extend device tree support

On Mon, Jun 20, 2022 at 02:32:17PM +0000, Pierluigi Passaro wrote:

> > > +  - drc-cfg-regs: Default registers value for R40/41/42/43 (DRC)
> > > +    The list must be (4 x num-drc-cfgs) entries long.
> > > +    If absent or incomplete, DRC is disabled.

> > What is the purpose of having num-drc-cfgs?  We can tell how large
> > drc-cfg-regs is so it just seems redundant.

> Can you please point me to any reference implementation doing this ?

of_property_read_variable_uX_array() should do what you want, you can
also use of_property_count_elems_of_size().  The main DT API header is
linux/of.h.

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