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 20:52:26 -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 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?

>
> -Matt
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