linux-kernel - Re: [PATCH v2 3/3] ASoC: da7213: Add bindings documentation for codec driver

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Message-ID: <CAL_JsqKnDVTONB4pUWiKV8Nhz=wWyQytkGjtak5BdT1K+RrOPg@mail.gmail.com>
Date:	Thu, 8 Oct 2015 08:16:17 -0500
From:	Rob Herring <robh@...nel.org>
To:	"Opensource [Adam Thomson]" <Adam.Thomson.Opensource@...semi.com>
Cc:	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Linux-ALSA <alsa-devel@...a-project.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Support Opensource <Support.Opensource@...semi.com>
Subject: Re: [PATCH v2 3/3] ASoC: da7213: Add bindings documentation for codec driver

On Thu, Oct 8, 2015 at 3:42 AM, Opensource [Adam Thomson]
<Adam.Thomson.Opensource@...semi.com> wrote:
> On October 07, 2015 17:22, Rob Herring wrote:
>
>> > +- dlg,micbias1-lvl : Voltage (mV) for Mic Bias 1
>> > +       [<1600>, <2200>, <2500>, <3000>]
>> > +- dlg,micbias2-lvl : Voltage (mV) for Mic Bias 2
>> > +       [<1600>, <2200>, <2500>, <3000>]
>>
>> Please append the units (-microvolt).
>
> Given that a user needs to read the bindings document to understand what is
> available, and what they're for, this seems a little unnecessary.

You may think so, but it is standard practice.

>>
>> > +- dlg,dmic-data-sel : DMIC channel select based on clock edge.
>> > +       ["lrise_rfall", "lfall_rrise"]
>> > +- dlg,dmic-samplephase : When to sample audio from DMIC.
>> > +       ["on_clkedge", "between_clkedge"]
>>
>> How about boolean for these two.
>
> Wanted these to be explicit, hence not choosing boolean. Would prefer to keep
> them as is.
>
>>
>> > +- dlg,dmic-clkrate : DMIC clock frequency (MHz).
>> > +       [<1500000>, <3000000>]
>>
>> So 1.5GHz or 3GHz?
>>
>> Add units (-hz).
>
> Agreed, the description of MHz is misleading so will update to Hz. Thanks.
> Again though, I don't see what the suffix gives you, and would prefer to leave
> the binding as is.

It tells someone reading the dts what the units are without having to
find the documentation and helps prevent people using properties with
differing units.

Rob
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