linux-kernel - Re: [PATCH 1/5] iio:adc:at91_adc8xx: introduce new atmel adc driver

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Date:	Wed, 23 Dec 2015 11:29:10 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Rob Herring <robh@...nel.org>
CC:	Ludovic Desroches <ludovic.desroches@...el.com>,
	<jic23@...nel.org>, <nicolas.ferre@...el.com>,
	<alexandre.belloni@...e-electrons.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-iio@...r.kernel.org>, <plagnioj@...osoft.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/5] iio:adc:at91_adc8xx: introduce new atmel adc driver

On Tue, Dec 22, 2015 at 06:51:18PM -0600, Rob Herring wrote:
> On Mon, Dec 21, 2015 at 10:24:08AM +0100, Ludovic Desroches wrote:
> > This driver supports the new version of the Atmel ADC device introduced
> > with the SAMA5D2 SoC family.
> > 
> > Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
> > ---
> >  .../devicetree/bindings/iio/adc/at91_adc8xx.txt    |  27 ++
> >  drivers/iio/adc/Kconfig                            |  11 +
> >  drivers/iio/adc/Makefile                           |   1 +
> >  drivers/iio/adc/at91_adc8xx.c                      | 417 +++++++++++++++++++++
> >  4 files changed, 456 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/adc/at91_adc8xx.txt
> >  create mode 100644 drivers/iio/adc/at91_adc8xx.c
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/adc/at91_adc8xx.txt b/Documentation/devicetree/bindings/iio/adc/at91_adc8xx.txt
> > new file mode 100644
> > index 0000000..64ad6a5
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/adc/at91_adc8xx.txt
> > @@ -0,0 +1,27 @@
> > +* AT91 SAMA5D2 Analog to Digital Converter (ADC)
> > +
> > +Required properties:
> > +  - compatible: Should be "atmel,sama5d2-adc".
> > +  - reg: Should contain ADC registers location and length.
> > +  - interrupts: Should contain the IRQ line for the ADC.
> > +  - clocks: phandles to clocks.
> > +  - clock-names: tuple listing clock names.
> > +      Required elements: "adc_clk", "adc_op_clk". "adc_clk" is the peripheral
> > +      clock, "adc_clk" is the sampling clock.
> > +  - vref-supply: Supply used as reference for conversions.
> > +
> > +Optional properties:
> > +  - vddana-supply: Supply for the adc device.
> 
> What makes a supply optional? If chip dependent, then then you need a 
> more specific compatible string.
> 

I thought I had read that we can supply an external vddana or having a
default one. Double checking the datasheet. I can't find it, I probably
read it on a draft version. Will move the vddana supply to required
properties.

Thanks

Ludovic
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