linux-kernel - Re: [PATCH 2/2] iio: afe: unit-converter: add support for adi,lt6106

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Date:   Wed, 11 Apr 2018 17:51:53 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     "Andrew F. Davis" <afd@...com>, Peter Rosin <peda@...ntia.se>,
        linux-kernel@...r.kernel.org
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Fabio Estevam <festevam@...il.com>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] iio: afe: unit-converter: add support for adi,lt6106

On 04/11/2018 05:43 PM, Andrew F. Davis wrote:
> On 04/11/2018 09:15 AM, Peter Rosin wrote:
>> This is a current sense amplifier from Analog Devices.
>>
>> Signed-off-by: Peter Rosin <peda@...ntia.se>
>> ---
>>  drivers/iio/afe/Kconfig              |  3 +-
>>  drivers/iio/afe/iio-unit-converter.c | 54 ++++++++++++++++++++++++++++++++++++
>>  2 files changed, 56 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/iio/afe/Kconfig b/drivers/iio/afe/Kconfig
>> index 642ce4eb12a6..0e10fe8f459a 100644
>> --- a/drivers/iio/afe/Kconfig
>> +++ b/drivers/iio/afe/Kconfig
>> @@ -10,7 +10,8 @@ config IIO_UNIT_CONVERTER
>>  	depends on OF || COMPILE_TEST
>>  	help
>>  	  Say yes here to build support for the IIO unit converter
>> -	  that handles voltage dividers and current sense shunts.
>> +	  that handles voltage dividers, current sense shunts and
>> +	  the LT6106 Current Sense Amplifier from Analog Devices.
> 
> Could work better to split these out into separate drivers. Maybe a
> iio-shunt-resistor.c that does just voltage->current with the
> appropriate scaling. Then make a a separate lt6106.c.

I don't think we need a separate driver here. There are tons of circuits
that all work the same way and all require the same properties. If we'd add
a driver for each of them we'd get buried in boilerplate code.