Re: [PATCH] nokia n900: update dts with camera support

Pavel Machek
2017-08-16T20:59:15Z

> Hi,
>
> On Wed, Aug 16, 2017 at 12:03:49AM +0200, Pavel Machek wrote:
> > diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
> > index 852041a..aade681 100644
> > --- a/Documentation/devicetree/bindings/media/video-interfaces.txt
> > +++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
> > @@ -119,6 +119,8 @@ Optional endpoint properties
> > as 0 (normal). This property is valid for serial busses only.
> > - strobe: Whether the clock signal is used as clock (0) or strobe (1). Used
> > with CCP2, for instance.
> > +- clock-inv: polarity of clock/strobe signal. 0 - not inverted, 1 - inverted
> > +- crc: crc is in use
>
> booleans in DT are not done with <0> and <1>, but as properties without
> values. True = property exists, False = property does not exist.

Well, strobe property above already uses = <0>/<1> format, as do
others.

Problem with "false = property does not exist" is that you don't know
if it is "someone forgot to define it" or "someone made a typo" or
"dts is too old to know about this property" or "the property indeed
should be false"...
Pavel

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