linux-kernel - Re: [PATCH 3/4] [media] ad5820: DT new optional field enable-gpios

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Message-ID: <20180920202840.GA31044@amd>
Date:   Thu, 20 Sep 2018 22:28:40 +0200
From:   Pavel Machek <pavel@....cz>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 3/4] [media] ad5820: DT new optional field enable-gpios

On Thu 2018-09-20 22:25:54, Ricardo Ribalda Delgado wrote:
> Hi
> On Thu, Sep 20, 2018 at 10:23 PM Laurent Pinchart
> <laurent.pinchart@...asonboard.com> wrote:
> >
> > On Thursday, 20 September 2018 23:21:28 EEST Laurent Pinchart wrote:
> > > Hi Ricardo,
> > >
> > > Thank you for the patch.
> > >
> > > On Thursday, 20 September 2018 19:19:11 EEST Ricardo Ribalda Delgado wrote:
> > > > Document new enable-gpio field. It can be used to disable the part
> > > > without turning down its regulator.
> > > >
> > > > Cc: devicetree@...r.kernel.org
> > > > Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
> > > > ---
> > > >
> > > >  Documentation/devicetree/bindings/media/i2c/ad5820.txt | 6 ++++++
> > > >  1 file changed, 6 insertions(+)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/media/i2c/ad5820.txt
> > > > b/Documentation/devicetree/bindings/media/i2c/ad5820.txt index
> > > > 5940ca11c021..07d577bb37f7 100644
> > > > --- a/Documentation/devicetree/bindings/media/i2c/ad5820.txt
> > > > +++ b/Documentation/devicetree/bindings/media/i2c/ad5820.txt
> > > >
> > > > @@ -8,6 +8,11 @@ Required Properties:
> > > >    - VANA-supply: supply of voltage for VANA pin
> > > >
> > > > +Optional properties:
> > > > +
> > > > +   - enable-gpios : GPIO spec for the XSHUTDOWN pin.
> > >
> > > xshutdown is active-low, so enable is active-high. Should this be documented
> > > explicitly, to avoid polarity errors ? Maybe something along the lines of
> > >
> > > - enable-gpios: GPIO spec for the XSHUTDOWN pin. Note that the polarity of
> > > the enable GPIO is the opposite of the XSHUTDOWN pin (asserting the enable
> > > GPIO deasserts the XSHUTDOWN signal and vice versa).
> 
> Agreed
> 
> >
> > Or alternatively you could name the property xshutdown-gpios, as explained in
> > my (incorrect) review of 2/4.
> 
> I have double negatives :). If there is no other option I will rename
> it xshutdown, but I want to give it a try to enable.

I think enable is fine.

									Pavel

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

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