linux-kernel - Re: [PATCH v6 1/2] iio:as3935: Add DT binding docs for AS3935 driver

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Message-ID: <CAKzfze9gYNk40fJHhanrbNtM1nKHGBQwLhRyGrR59mXN3j-7gA@mail.gmail.com>
Date:	Mon, 10 Feb 2014 17:26:03 -0800
From:	Matt Ranostay <mranostay@...il.com>
To:	Mark Rutland <mark.rutland@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"matt.porter@...aro.org" <matt.porter@...aro.org>,
	"pantelis.antoniou@...il.com" <pantelis.antoniou@...il.com>
Subject: Re: [PATCH v6 1/2] iio:as3935: Add DT binding docs for AS3935 driver

On Mon, Feb 10, 2014 at 2:58 AM, Mark Rutland <mark.rutland@....com> wrote:
> On Mon, Feb 10, 2014 at 04:27:30AM +0000, Matt Ranostay wrote:
>> Document compatible string, required and optional DT properties for
>> AS3935 chipset driver.
>>
>> Signed-off-by: Matt Ranostay <mranostay@...il.com>
>> ---
>>  .../devicetree/bindings/iio/proximity/as3935.txt   | 27 ++++++++++++++++++++++
>>  .../devicetree/bindings/vendor-prefixes.txt        |  1 +
>>  2 files changed, 28 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/iio/proximity/as3935.txt
>>
>> diff --git a/Documentation/devicetree/bindings/iio/proximity/as3935.txt b/Documentation/devicetree/bindings/iio/proximity/as3935.txt
>> new file mode 100644
>> index 0000000..0453254
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/proximity/as3935.txt
>> @@ -0,0 +1,27 @@
>> +Austrian Microsystems AS3935 Franklin lightning sensor device driver
>> +
>> +Required properties:
>> +     - compatible: must be "ams,as3935"
>> +     - reg: SPI chip select number for the device
>> +     - spi-cpha: SPI Mode 1. Refer to spi/spi-bus.txt for generic SPI
>> +     slave node bindings.
>> +     - interrupt-parent : should be the phandle for the interrupt controller
>> +     - interrupts : interrupt mapping
>
> Nit: Please don't use the term "interrupt mapping", as it's undefined
> and clashes with the "interrupt-map" property on an interrupt nexus.
> There are a lot of bindings using it, and it would be nice to get them
> fixed up too.
>
> As interrupts can be described in a couple of ways it probably doesn't
> make sense to state the exact format here, but could this be something
> like the following instead:
>
> - interrupts: the sole interrupt generated by the device.
>

Noted.

>> +
>> +     Refer to interrupt-controller/interrupts.txt for generic
>> +     interrupt client node bindings.
>> +
>> +Optional properties:
>> +     - ams,tune-cap: Calibration tuning capacitor stepping value 0 - 120pF.
>> +       This will require using the calibration data from the manufacturer.
>
> I think "tune-cap" is a little terse. Also "cap" is used as an
> abbreviation for "capability" elsewhere, and it would be nice to make
> it clear that in this case it means "capacitor".
>
> Could this be "ams,tuning-capacitor-pf" instead? That would make it
> clear at a glance what the value is and the units (though people would
> still ahve to refer to documentation to figure out precisely what this
> means).
>
Yeah that would be a lot more clear. Noted for next version.

>> +
>> +Example:
>> +
>> +as3935@0 {
>> +     compatible = "ams,as3935";
>> +     reg = <0>;
>> +     spi-cpha;
>> +     interrupt-parent = <&gpio1>;
>> +     interrupts = <16 1>;
>> +     ams,tune-cap = <80>;
>> +};
>> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
>> index e9d19e2..03e50ff 100644
>> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
>> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
>> @@ -11,6 +11,7 @@ ak  Asahi Kasei Corp.
>>  allwinner    Allwinner Technology Co., Ltd.
>>  altr Altera Corp.
>>  amcc Applied Micro Circuits Corporation (APM, formally AMCC)
>> +ams  AMS AG
>
> The vendor-prefix addition looks fine to me.
>
> Thanks,
> Mark.
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