linux-kernel - Re: [PATCH v3 3/3] iio:Documentation: Add documentation for hinge sensor channels

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Date:   Mon, 14 Dec 2020 14:16:40 +0800
From:   "Ye, Xiang" <xiang.ye@...el.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     jikos@...nel.org, srinivas.pandruvada@...ux.intel.com,
        linux-input@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] iio:Documentation: Add documentation for hinge
 sensor channels

On Sun, Dec 13, 2020 at 02:15:45PM +0000, Jonathan Cameron wrote:
> On Mon, 7 Dec 2020 17:18:18 +0800
> "Ye, Xiang" <xiang.ye@...el.com> wrote:
> 
> > Hi Jonathan
> > 
> > Thanks for review and comments.
> > 
> > On Sat, Dec 05, 2020 at 04:05:40PM +0000, Jonathan Cameron wrote:
> > > On Thu,  3 Dec 2020 11:53:52 +0800
> > > Ye Xiang <xiang.ye@...el.com> wrote:
> > >   
> > > > Add channel description for hinge sensor, including channel label
> > > > attribute and raw data description.
> > > > 
> > > > Signed-off-by: Ye Xiang <xiang.ye@...el.com>
> > > > ---
> > > >  Documentation/ABI/testing/sysfs-bus-iio | 17 +++++++++++++++++
> > > >  1 file changed, 17 insertions(+)
> > > > 
> > > > diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> > > > index df42bed09f25..82303b1bdff0 100644
> > > > --- a/Documentation/ABI/testing/sysfs-bus-iio
> > > > +++ b/Documentation/ABI/testing/sysfs-bus-iio
> > > > @@ -1802,3 +1802,20 @@ Contact:	linux-iio@...r.kernel.org
> > > >  Description:
> > > >  		Unscaled light intensity according to CIE 1931/DIN 5033 color space.
> > > >  		Units after application of scale are nano nanowatts per square meter.
> > > > +
> > > > +What:		/sys/bus/iio/devices/iio:deviceX/in_anglY_raw
> > > > +KernelVersion:	5.12
> > > > +Contact:	linux-iio@...r.kernel.org
> > > > +Description:
> > > > +		Angle of rotation for channel Y. Units after application of scale
> > > > +		and offset are radians.  
> > > 
> > > This entry is already mostly in the doc around line 200, just without the index.
> > > Please just add the What: line to that block to reduce repetition.
> > > If you want to add... "Where present, Y indexes the channel." or something like
> > > that feel free.  
> > When adding in_anglY_raw to in_angl_raw block, Should I update the KernelVersion form
> > 4.17 to 5.12? Like blow:
> > 
> > What:		/sys/bus/iio/devices/iio:deviceX/in_angl_raw
> > What:		/sys/bus/iio/devices/iio:deviceX/in_anglY_raw
> > KernelVersion:	5.12
> > Contact:	linux-iio@...r.kernel.org
> > Description:
> > 		Angle of rotation. Units after application of scale and offset
> > 		are radians. Where present, Y indexes the channel.
> 
> No. This is an unfortunate limitation of these files unless we keep duplicating
> nearly identical text.
> 
> I'm not that worried about documenting an optional bit of ABI as apparently
> being in an earlier kernel than it actually was.  That way any userspace
> will work.  The other way around is more likely to cause problems.
Got it, then I will keep KernelVersion 4.17. will send the next version out
for review soon. Thanks again for the review.
> 
> > 
> > > 
> > >   
> > > > +
> > > > +What:		/sys/bus/iio/devices/iio:deviceX/in_anglY_label
> > > > +KernelVersion:	5.12
> > > > +Contact:	linux-iio@...r.kernel.org
> > > > +Description:
> > > > +		Optional symbolic label for channel Y.
> > > > +		For Intel hid hinge sensor, the label values are:
> > > > +		hinge, keyboard, screen. It means the three channels
> > > > +		each correspond respectively to hinge angle, keyboard angle,
> > > > +		and screen angle.  
> > > 
> > > Makes sense to keep this block separate given the additional info provided.
> > > Alternative would be to add it to the one with in_voltageY_label which would
> > > be odd given what follows!  
> > Ok, Then I will keep the in_anglY_label block here. BTW, I didnot see in_voltageY_label
> > in sysfs-bus-iio in current kernel master branch.
> It was part of the series that added the support for per channel labels to the core.
> 3079188f821c ("iio:Documentation: Add documentation for label channel attribute")
> so will only going into current master in the merge window that will open shortly.
got it.
> 

Thanks
Ye, Xiang