linux-kernel - Re: [PATCH] iio: adc: add driver for MCP3204/08 12-bit ADC

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Date:	Wed, 1 May 2013 23:02:02 +0200
From:	Oskar Andero <oskar.andero@...il.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	Jonathan Cameron <jic23@....ac.uk>
Subject: Re: [PATCH] iio: adc: add driver for MCP3204/08 12-bit ADC

Hi,

On 16:07 Wed 01 May     , Lars-Peter Clausen wrote:
> On 05/01/2013 12:21 AM, Oskar Andero wrote:
> > This adds support for Microchip's 12 bit AD converters MCP3204 and
> > MCP3208. These chips communicates over SPI and supports single-ended
> > and pseudo-differential configurations.
> > 
> > Cc: Jonathan Cameron <jic23@....ac.uk>
> > Cc: Lars-Peter Clausen <lars@...afoo.de>
> > Signed-off-by: Oskar Andero <oskar.andero@...il.com>
> 
> Hi,
> 
> Looks very good in general. A few minor things, mostly related to the regulator
> handling and a couple of nitpicks inline.

Thanks for reviewing! I will prepare version 2 shortly.

> > +
> > +		ret = regulator_enable(adc->reg);
> > +		if (ret < 0)
> > +			goto reg_free;
> > +	} else {
> > +		adc->ref_mv = pdata->ref_mv;
> 
> I'd like to see this fallback path go away. For supplies with a const voltage
> the fixed-voltage-regulator can be used.
> 

Ok. I added this since the voltage I use for reference is behind a level-shifter,
meaning there is actually no regulator on the board providing that exact
voltage level. Not sure what you mean with "the fixed-voltage-regulator", but
maybe that is what I am looking for in my case?

Thanks!

-Oskar
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