linux-kernel - Re: [PATCH] sound/tlv320dac33: Add device tree support

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Message-ID: <20180130103538.GD18104@amd>
Date:   Tue, 30 Jan 2018 11:35:38 +0100
From:   Pavel Machek <pavel@....cz>
To:     Ladislav Michl <ladis@...ux-mips.org>
Cc:     Filip Matijević <filip.matijevic.pz@...il.com>,
        lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, perex@...ex.cz, tiwai@...e.com,
        bhumirks@...il.com, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        pali.rohar@...il.com, sre@...nel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        clayton@...ftyguy.net, martijn@...xit.nl,
        sakari.ailus@...ux.intel.com
Subject: Re: [PATCH] sound/tlv320dac33: Add device tree support

On Tue 2018-01-30 11:10:46, Ladislav Michl wrote:
> On Tue, Jan 30, 2018 at 11:00:23AM +0100, Pavel Machek wrote:
> > On Tue 2018-01-30 10:38:38, Ladislav Michl wrote:
> > > On Tue, Jan 30, 2018 at 10:11:02AM +0100, Filip Matijević wrote:
> > > > Hi,
> > > > 
> > 
> > > > > Well, notice I'm converting existing driver to device tree. And that
> > > > > one already has GPIO dependency. It is possible that more work needs
> > > > > to be done there, but that should not be a reason to delay this. Feel
> > > > > free to help.
> > > 
> > > Adding DT properties that need to be maintained for compatibility reasons
> > > is a bad idea and very good reason to delay merging unfinished stuff.
> > > And meanwhile it turned out it is not power-gpio :)
> > 
> > I believe reset-gpios and power-gpios are commonly used like
> > this... and that's what the old code does.
> 
> Why do you care about old code when introducing new DT property?
> Either it is reset, then lets call it reset-gpios or it is power supply
> and then voltage regulator should be used (VAUX4.OUT is such a regulator
> although it is unclear to me how it is controlled (*)).

power gpio = !reset gpio. Difference is only in polarity.

> > You are not helping.
> 
> The only way I can help here is to resend your patch with "reset-gpios"
> used, which I'm pretty sure you can handle yourself.

Well, you can do that, and then you can argue with the next person who
feels one of the properties has to get his preferred color. Hard part
is not changing code :-(.

									Pavel

> (*) Remark "DAC33 enabled (for example, plug in a headset to the 3.5mm
> AV connector and start music playback from the device)" in schematics
> suggests it is controlled somehow.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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