linux-kernel - Re: [PATCH v4 1/2] iio:as3935: Add DT binding docs for AS3935 driver

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Date:	Tue, 4 Feb 2014 21:30:52 -0800
From:	Matt Ranostay <mranostay@...il.com>
To:	Matt Porter <mporter@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	Pantelis Antoniou <pantelis.antoniou@...il.com>
Subject: Re: [PATCH v4 1/2] iio:as3935: Add DT binding docs for AS3935 driver

On Tue, Feb 4, 2014 at 9:17 PM, Matt Porter <mporter@...aro.org> wrote:
> On Tue, Feb 04, 2014 at 08:52:26PM -0800, Matt Ranostay Matt Ranostay wrote:
>> On Tue, Feb 4, 2014 at 8:43 PM, Matt Porter <mporter@...aro.org> wrote:
>> > On Tue, Feb 04, 2014 at 07:14:55PM -0800, Matt Ranostay 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   | 25 ++++++++++++++++++++++
>> >>  1 file changed, 25 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..7e117cd
>> >> --- /dev/null
>> >> +++ b/Documentation/devicetree/bindings/iio/proximity/as3935.txt
>> >> @@ -0,0 +1,25 @@
>> >> +Austrian Microsystems AS3935 Franklin lightning sensor device driver
>> >> +
>> >> +Required properties:
>> >> +     - compatible: must be "ams,as3935"
>> >
>> > Change this to "amstaos,as3935"
>> >
>> > amstaos (AMS bought Taos) is already a registered vendor prefix in
>> > vendor-prefixes.txt
>> >
>> >> +     - reg: SPI chip select number for the device
>> >> +     - spi-cpha: SPI Mode 1
>> >
>> > When using generic binding properties, please reference the binding
>> > being used. Like:
>> >
>> >         - spi-cpha: SPI Mode 1. Refer to spi/spi-bus.txt for generic SPI
>> >           slave node bindings.
>> >
>> Noted.
>>
>> >> +     - interrupt-parent : should be the phandle for the interrupt controller
>> >> +     - interrupts : interrupt mapping for GPIO IRQ
>> >
>> >         Refer to interrupt-controller/interrupts.txt for generic
>> >         interrupt client node bindings.
>> >
>> Noted.
>>
>> >> +
>> >> +Optional properties:
>> >> +     - ams,tune-cap: Calibration tuning capacitor stepping value 0 - 15.
>> >> +       Range of 0 to 120 pF, 8pF steps. This will require using the
>> >> +       calibration data from the manufacturer.
>> >> +
>> >> +
>> >> +Example:
>> >> +
>> >> +as3935@0 {
>> >> +     compatible = "ams,as3935";
>> >> +     reg = <0>;
>> >> +     spi-cpha;
>> >> +     interrupt-parent = <&gpio1>;
>> >> +     interrupts = <16 1>;
>> >> +     ams,tune-cap = /bits/ 8 <10>;
>> >
>> > What is this? Why not just ams,tune-cap = <10>; ?
>> >
>> > It's a value between 0-15, right?
>>
>> Correct but it is using of_property_read_u8() so that requires the
>> /bits/ statement.
>> Should this just be a u32 value?
>
> Do you really need a u8? If not just read_u32() into an int and keep
> this syntax simple.

Just me different it seems :P.  Will fix in next version waiting for
Peter's and Jonathan's input on the rest of the code first.

>
> -Matt
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