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

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Message-ID: <20140205051730.GA3911@beef>
Date:	Wed, 5 Feb 2014 00:17:30 -0500
From:	Matt Porter <mporter@...aro.org>
To:	Matt Ranostay <mranostay@...il.com>
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 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.

-Matt
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