linux-kernel - Re: Question about fixed regulator DT properties

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Date:	Tue, 25 Nov 2014 12:17:49 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Question about fixed regulator DT properties

On Wed, Nov 19, 2014 at 04:38:01PM +0200, Vladimir Zapolskiy wrote:
> Hello Mark,
> 
> On 18.11.2014 17:00, Vladimir Zapolskiy wrote:

Your mail is really quite long and all in quotes which makes it hard to
follow, brevity is really helpful to readers.

> > | regulator-boot-on | enable-active-high | GPIO polarity | GPIO output |
> > +-------------------+--------------------+---------------+-------------+
> > |        no         |         yes        |  active high  |    low      |
> > |        no         |          no        |  active low   |   high      |

> > I'd rather think that both resulting GPIO outputs are incorrect or
> > better to say do not correspond to my perception of "regulator-boot-on"
> > and "enable-active-high" DTS properties described in the documentation,
> > however above "enable-active-high" and actual GPIO polarity are the same
> > (when they are not, it is another open topic for discussion).

What you're saying seems sensible.

> > Should documentation be updated to reflect "regulator-boot-on" role that
> > a regulator is re-enabled by the kernel?

I'm confused about this.  That's the sole purpose of the flag and as far
as I can tell it's what the documentation says.

> > Should "enable-active-high" be replaced by getting GPIO flags directly?

Probably makes sense, it predates those flags by quite some time.

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