linux-kernel - Re: [PATCH 2/3] iio: adc: ina3221: Add support for IIO ADC driver for TI INA3221

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Message-ID: <57516A74.4060008@nvidia.com>
Date:	Fri, 3 Jun 2016 17:01:00 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Jonathan Cameron <jic23@...nel.org>, <robh+dt@...nel.org>,
	<corbet@....net>, <lars@...afoo.de>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-iio@...r.kernel.org>,
	<linux-hwmon@...r.kernel.org>, Jean Delvare <khali@...ux-fr.org>,
	"Guenter Roeck" <linux@...ck-us.net>
Subject: Re: [PATCH 2/3] iio: adc: ina3221: Add support for IIO ADC driver
 for TI INA3221


On Friday 03 June 2016 03:46 PM, Jonathan Cameron wrote:
> On 03/06/16 11:06, Jonathan Cameron wrote:
>>
>> Code looks good, bu these more fundamental bits need sorting.
> Another minor point - why do the power calculations in driver?
> no hardware support for it, so why not just leave it to userspace?

Device supports the bus and shunt voltage monitoring. So even no 
current. Also the warning/critical limit is for the voltage across shunt.

So should we only expose the shunt/bus voltage, no power/current?

I am thinking that user space should not know the platform and hence 
shunt resistance and so exposing the current and power on bus is better 
option.