linux-kernel - [PATCHv3] dt-bindings: Avago APDS990X light sensor

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Date:   Mon, 8 Jan 2018 23:20:54 +0100
From:   Pavel Machek <pavel@....cz>
To:     Rob Herring <robh@...nel.org>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>, mark.rutland@....com,
        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,
        Filip Matijević <filip.matijevic.pz@...il.com>
Subject: [PATCHv3] dt-bindings: Avago APDS990X light sensor

Hi!

> > From: Filip Matijević <filip.matijevic.pz@...il.com>
> > 
> > This prepares binding for light sensor used in Nokia N9.
> 
> "dt-bindings: ..." is the preferred subject prefix.

Ok.

> > +++ b/Documentation/devicetree/bindings/misc/avago-apds990x.txt
> 
> Put this with other light sensors whether you use IIO or not:
> 
> bindings/iio/light/

Makes sense. Patches to convert to IIO are available.

> > @@ -0,0 +1,41 @@
> > +Avago APDS990X driver
> 
> Bindings aren't drivers.

Ok.

> > +https://docs.broadcom.com/docs/AV02-2867EN
> > +
> > +Required properties:
> > +- compatible: "avago,apds990x"
> > +- reg: address on the I2C bus
> > +- interrupts: external interrupt line number
> > +- vdd-supply: power supply for VDD
> > +- vled-supply: power supply for LEDA
> > +- avago,ga: Glass attenuation
> 
> We already have "upisemi,glass-coef". Can we align on something
> common.

upisemi seems to have different units (1/1000 vs. 1/4096). Do you want
me to do change to avago,glass-coef or ....?

> > +- avago,cf1: Clear channel factor 1
> > +- avago,irf1: IR channel factor 1
> > +- avago,cf2: Clear channel factor 2
> > +- avago,irf2: IR channel factor 2
> 
> Perhaps 2 properties with 2 cells for factor 1 and 2.

This is obviously easier to keep, but I can change.

> > +- avago,df: Device factor
> 
> Units/range for all these?

Fixed point, with 4096 == 1.00.

> > +- avago,pdrive: IR current, one of APDS_IRLED_CURR_XXXmA values
> 
> Don't we have standard current property for LEDs?

We do have "led-max-microamp"; which is not quite what this is. I
guess we can do "led-microamp" if you prefer?

> > +- avago,ppcount: Proximity pulse count
> 
> Is this standard for prox sensors?

I don't know many proximity sensors. Seems like way to raise sensitivity.

Best regards,
								Pavel

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

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