linux-kernel - Re: [PATCH v2 0/2] Implement sample time consideration for Vybrid's ADC

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Message-ID: <20150710180128.GA8723@Sanchayan-Arch>
Date:	Fri, 10 Jul 2015 23:31:28 +0530
From:	maitysanchayan@...il.com
To:	Shawn Guo <shawnguo@...nel.org>
Cc:	jic23@...nel.org, shawn.guo@...aro.org, kernel@...gutronix.de,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	B38611@...escale.com, devicetree@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, stefan@...er.ch
Subject: Re: [PATCH v2 0/2] Implement sample time consideration for Vybrid's
 ADC

Hello Shawn,

On 15-07-10 16:47:04, Shawn Guo wrote:
> On Wed, Jun 24, 2015 at 02:03:39PM +0530, Sanchayan Maity wrote:
> > Hello,
> > 
> > This patchset adds a dt binding for specifying sample time
> > for the vybrid adc driver and takes this into account for
> > sampling frequency calculation and related configuration in
> > the driver.
> > 
> > The patchset is based on top of Stefan's patches here
> > http://lkml.iu.edu/hypermail/linux/kernel/1505.3/02043.html
> > 
> > which got recently applied. Tested with shawn's for-next
> > branch.
> > 
> > Changes since v1:
> > 
> > Change from a vendor specific fsl,min-sample-time to non vendor
> > specific min-sample-time.
> 
> What's the reason for that?  Property without vendor prefix would be
> the generic one, which should be defined by generic ADC bindings, not
> vf610-adc.txt.

The reason for going with a generic one was discussed in the first series,
as though there might not be any devices at the moment using this property,
some might appear or use it in the future.

I did consider putting this in the generic ADC bindings, however for lack
of one like one present for touchscreen, I kept it in the vf610 specific
driver binding. Thought there should not be any harm with this.

- Sanchayan.

> 
> Shawn
> 
> > 
> > Version 1 of the patchset can be found here
> > http://lkml.iu.edu/hypermail/linux/kernel/1506.1/00026.html
> > 
> > - Sanchayan.
> > 
> > Sanchayan Maity (2):
> >   iio: adc: Determine sampling frequencies by using minimum sample time
> >   ARM: dts: vfxxx: Add property for minimum sample time
> > 
> >  .../devicetree/bindings/iio/adc/vf610-adc.txt      |  6 ++
> >  arch/arm/boot/dts/vfxxx.dtsi                       |  2 +
> >  drivers/iio/adc/vf610_adc.c                        | 74 ++++++++++++++++++++--
> >  3 files changed, 78 insertions(+), 4 deletions(-)
> > 
> > -- 
> > 2.4.4
> > 
> > --
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