linux-kernel - Re: [PATCH v3 2/2] ARM: dts: vf-colibri: Add property for minimum sample time

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Date:	Sun, 19 Jul 2015 13:44:55 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Stefan Agner <stefan@...er.ch>, Shawn Guo <shawnguo@...nel.org>
CC:	Sanchayan Maity <maitysanchayan@...il.com>, mark.rutland@....com,
	devicetree@...r.kernel.org, B38611@...escale.com,
	pawel.moll@....com, ijc+devicetree@...lion.org.uk,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	robh+dt@...nel.org, kernel@...gutronix.de, galak@...eaurora.org,
	shawn.guo@...aro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/2] ARM: dts: vf-colibri: Add property for minimum
 sample time

On 15/07/15 14:02, Stefan Agner wrote:
> On 2015-07-15 03:57, Shawn Guo wrote:
>> On Tue, Jul 14, 2015 at 07:23:23PM +0530, Sanchayan Maity wrote:
>>> Add a device tree property which allows to specify the minimum sample
>>> time which can be used to calculate the actual ADC cycles required
>>> depending on the hardware.
>>>
>>> Signed-off-by: Sanchayan Maity <maitysanchayan@...il.com>
>>> ---
>>>  arch/arm/boot/dts/vf-colibri.dtsi | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/vf-colibri.dtsi b/arch/arm/boot/dts/vf-colibri.dtsi
>>> index ab10d2e..59f5deb 100644
>>> --- a/arch/arm/boot/dts/vf-colibri.dtsi
>>> +++ b/arch/arm/boot/dts/vf-colibri.dtsi
>>> @@ -16,10 +16,12 @@
>>>  };
>>>
>>>  &adc0 {
>>> +	min-sample-time = <1000>;
>>>  	status = "okay";
>>>  };
>>>
>>>  &adc1 {
>>> +	min-sample-time = <1000>;
>>
>> Since this is the default value anyway, we can just save the patch,
>> right?
> 
> I thought it would be nice to be explicit here and define this value
> which we verified internally.
> 
> On the other hand, we did not derived the minimum value from the DS
> (using the capacity/resistance of the actual analog source connected) to
> maximize the sampling frequency, hence I'm also ok with not explicitly
> defining a value.
I'll drop this patch then and we are all happy (I think)
> 
> --
> Stefan
> --
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