linux-kernel - Re: [PATCH 1/5] iio: adxl372: New driver for Analog Devices ADXL372 Accelerometer

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Date:   Mon, 16 Jul 2018 13:13:55 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Jonathan Cameron <jic23@...nel.org>,
        Stefan Popa <stefan.popa@...log.com>
Cc:     Michael.Hennerich@...log.com, knaack.h@....de, pmeerw@...erw.net,
        mchehab@...nel.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
        rdunlap@...radead.org, shreeya.patel23498@...il.com,
        mirq-linux@...e.qmqm.pl, thierry.escande@...labora.com,
        himanshujha199640@...il.com, gwendal@...omium.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH 1/5] iio: adxl372: New driver for Analog Devices ADXL372
 Accelerometer

On 07/15/2018 11:51 AM, Jonathan Cameron wrote:
> On Thu, 12 Jul 2018 18:34:23 +0300
> Stefan Popa <stefan.popa@...log.com> wrote:
> 
>> This patch adds basic support for Analog Devices ADXL372 SPI-Bus
>> Three-Axis Digital Accelerometer.
>>
>> The device is probed and configured the with some initial default
>> values. With this basic driver, it is possible to read raw acceleration
>> data.
>>
>> Datasheet:
>> http://www.analog.com/media/en/technical-documentation/data-sheets/ADXL372.pdf
>>
>> Signed-off-by: Stefan Popa <stefan.popa@...log.com>
> 
> Hi Stefan,
> 
> Looks pretty good, but a few comments inline.
> 
> The slightly 'unusual' register read / write field in the least significant
> bit is a pain.  I really don't like the approach of 'fiddling' the register
> addresses each time though so I think you need a custom version of
> regmap-spi to deal with this inside.  I wonder how often this
> pattern actually occurs and whether it's worth thinking about extending
> the core regmap to deal with it (so add a shift value for addresses).

regmap should be able to handle this as is. pad_bits = 1, reg_bits = 7
should ensure the correct behavior.