linux-kernel - Re: [PATCH v2 3/7] iio: tsl2772: add support for reading power settings from device tree

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Message-ID: <20180721183716.524632f1@archlinux>
Date:   Sat, 21 Jul 2018 18:37:16 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Brian Masney <masneyb@...tation.org>, mark.rutland@....com,
        andy.gross@...aro.org, david.brown@...aro.org,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, jonathan@...ek.ca,
        jmaneyrol@...ensense.com, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, mkelly@...o.com, fischerdouglasc@...il.com,
        bshah@....org, ctatlor97@...il.com, drew.paterson@....com
Subject: Re: [PATCH v2 3/7] iio: tsl2772: add support for reading power
 settings from device tree

On Fri, 20 Jul 2018 11:36:35 -0600
Rob Herring <robh@...nel.org> wrote:

> On Tue, Jul 17, 2018 at 04:41:54AM -0400, Brian Masney wrote:
> > This patch adds support for optionally reading the prox_diode and
> > prox_power settings from device tree. This was tested using a LG
> > Nexus 5 (hammerhead) which requires a different diode than the driver
> > default for the IR LED.
> > 
> > Signed-off-by: Brian Masney <masneyb@...tation.org>
> > ---
> > The next patch in the series removes the tsl2772 driver from the
> > trivial-devices.txt file. I separated it out so that change can go
> > through device tree.
> > 
> >  .../devicetree/bindings/iio/light/tsl2772.txt | 39 +++++++++++++++++++  
> 
> Please split DT bindings to separate patch.
> 
> >  drivers/iio/light/tsl2772.c                   | 16 ++++++++
> >  include/dt-bindings/iio/amstaos,tsl2772.h     | 24 ++++++++++++
> >  3 files changed, 79 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/light/tsl2772.txt
> >  create mode 100644 include/dt-bindings/iio/amstaos,tsl2772.h
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/light/tsl2772.txt b/Documentation/devicetree/bindings/iio/light/tsl2772.txt
> > new file mode 100644
> > index 000000000000..ab553d52b9fc
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/light/tsl2772.txt
> > @@ -0,0 +1,39 @@
> > +* AMS/TAOS ALS and proximity sensor
> > +
> > +Required properties:
> > +
> > +  - compatible: Should be one of
> > +		"amstaos,tsl2571"
> > +		"amstaos,tsl2671"
> > +		"amstaos,tmd2671"
> > +		"amstaos,tsl2771"
> > +		"amstaos,tmd2771"
> > +		"amstaos,tsl2572"
> > +		"amstaos,tsl2672"
> > +		"amstaos,tmd2672"
> > +		"amstaos,tsl2772"
> > +		"amstaos,tmd2772"
> > +  - reg: the I2C address of the device
> > +
> > +Optional properties:
> > +
> > +  - amstaos,prox_diode - must be TSL2772_DIODE0, TSL2772_DIODE1, or
> > +                         TSL2772_DIODE_BOTH.  
> 
> s/_/-/
> 
> > +  - amstaos,prox_power - must be TSL2772_100_mA, TSL2772_50_mA, TSL2772_25_mA,
> > +                         or TSL2772_13_mA.  
> 
> I wonder if this should be common. Perhaps we should use the existing 
> 'led-max-microamp' as this is setting the current for an IR LED.

Seems reasonable, then perhaps have two controls to turn on the diodes
above.

> 
> And while called 'power' this setting is current.

Also can we have real values?  I really don't like defines if they
aren't absolutely necessary - particularly when there is a nice real
unit to be used.

> 
> > +  - interrupt-parent: should be the phandle for the interrupt controller  
> 
> Don't need to document this. It's implied by interrupts (and could be in 
> a parent node).
> 
> > +  - interrupts: the sole interrupt generated by the device
> > +
> > +  Refer to interrupt-controller/interrupts.txt for generic interrupt client
> > +  node bindings.
> > +
> > +Example:
> > +
> > +#include <dt-bindings/iio/amstaos,tsl2772.h>
> > +
> > +tsl2772@39 {
> > +	compatible = "amstaos,tsl2772";
> > +	reg = <0x39>;
> > +	interrupts-extended = <&msmgpio 61 IRQ_TYPE_EDGE_FALLING>;
> > +	amstaos,prox_diode = <TSL2772_DIODE0>;
> > +};  
> --
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