linux-kernel - Re: [PATCHv2] Device tree binding for Avago APDS990X light sensor

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Date:   Fri, 5 Jan 2018 10:01:37 -0600
From:   Rob Herring <robh@...nel.org>
To:     Pavel Machek <pavel@....cz>
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: Re: [PATCHv2] Device tree binding for Avago APDS990X light sensor

On Tue, Jan 02, 2018 at 01:44:51PM +0100, Pavel Machek wrote:
> 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.

> 
> Signed-off-by: Filip Matijević <filip.matijevic.pz@...il.com>
> Signed-off-by: Pavel Machek <pavel@....cz>
> 
> diff --git a/Documentation/devicetree/bindings/misc/avago-apds990x.txt b/Documentation/devicetree/bindings/misc/avago-apds990x.txt
> new file mode 100644
> index 0000000..480c0b1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/avago-apds990x.txt

Put this with other light sensors whether you use IIO or not:

bindings/iio/light/

> @@ -0,0 +1,41 @@
> +Avago APDS990X driver

Bindings aren't drivers.

> +
> +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.

> +- 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.

> +- avago,df: Device factor

Units/range for all these?

> +- avago,pdrive: IR current, one of APDS_IRLED_CURR_XXXmA values

Don't we have standard current property for LEDs?

> +- avago,ppcount: Proximity pulse count

Is this standard for prox sensors?

> +
> +Example (Nokia N9):
> +
> +	als_ps@39 {

light-sensor@39

> +		compatible = "avago,apds990x";
> +		reg = <0x39>;
> +
> +		interrupt-parent = <&gpio3>;
> +		interrupts = <19 (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)>; /* gpio_83 */
> +
> +		vdd-supply = <&vaux1>;
> +		vled-supply = <&vbat>;
> +
> +		avago,ga	= <168834>;
> +		avago,cf1	= <4096>;
> +		avago,irf1	= <7824>;
> +		avago,cf2	= <877>;
> +		avago,irf2	= <1575>;
> +		avago,df	= <52>;
> +
> +		avago,pdrive	= <0x2>; /* APDS_IRLED_CURR_25mA */
> +		avago,ppcount	= <5>;
> +	};
> 
> -- 
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html