linux-kernel - RE: [PATCH 2/2] iio:magnetometer: Support for ST magnetic sensors

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Date:   Thu, 11 Mar 2021 07:46:29 +0000
From:   LI Qingwu <qing-wu.li@...ca-geosystems.com.cn>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Jonathan Cameron <jic23@...nel.org>
CC:     Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Denis Ciocca <denis.ciocca@...com>,
        linux-iio <linux-iio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        TERTYCHNYI Grygorii <grygorii.tertychnyi@...ca-geosystems.com>,
        ZHIZHIKIN Andrey <andrey.zhizhikin@...ca-geosystems.com>,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Subject: RE: [PATCH 2/2] iio:magnetometer: Support for ST magnetic sensors

Hi Andy,

Thanks a lot for your input, I just extend the existing driver in patch V2 for the sersor.



Best Regards

**********************************************
Li Qingwu (Terry)
Senior Embedded Software Engineer 
Leica Geosystems(Shanghai)Co.,Limited
(Tel): +86 21 61061036
(FAX): +86 21 61061008
(Mobile): +86 187 0185 9600
E-mail: Qing-wu.Li@...ca-geosystems.com.cn
Http: www.leica-geosystems.com.cn
**********************************************

-----Original Message-----
From: Andy Shevchenko <andy.shevchenko@...il.com> 
Sent: Tuesday, March 9, 2021 7:01 PM
To: Jonathan Cameron <jic23@...nel.org>
Cc: LI Qingwu <qing-wu.li@...ca-geosystems.com.cn>; Lars-Peter Clausen <lars@...afoo.de>; Peter Meerwald <pmeerw@...erw.net>; Rob Herring <robh+dt@...nel.org>; Denis Ciocca <denis.ciocca@...com>; linux-iio <linux-iio@...r.kernel.org>; devicetree <devicetree@...r.kernel.org>; Linux Kernel Mailing List <linux-kernel@...r.kernel.org>; TERTYCHNYI Grygorii <grygorii.tertychnyi@...ca-geosystems.com>; ZHIZHIKIN Andrey <andrey.zhizhikin@...ca-geosystems.com>; Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Subject: Re: [PATCH 2/2] iio:magnetometer: Support for ST magnetic sensors

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On Sat, Mar 6, 2021 at 6:44 PM Jonathan Cameron <jic23@...nel.org> wrote:
> On Fri,  5 Mar 2021 07:05:36 +0000
> LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn> wrote:
>
> > Add support for STMicroelectronics digital magnetic sensors, 
> > LSM303AH,LSM303AGR,LIS2MDL,ISM303DAC,IIS2MDC.
> >
> > The patch tested with IIS2MDC instrument.
> >
> > Signed-off-by: LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn>
>
> Hi,
>
> Given that at least two parts in here is supported by the existing 
> driver in iio/magnetometers/st_magn_*.c (lsm303agr) can you confirm 
> that it doesn't make sense to simply extend that driver to support the 
> other parts?  This is particularly true when the WHO AM I register 
> reads 0x40 for all these parts.
>
> I've done a fairly superficial review whilst here, but please check 
> you can't just add the relevant entries to the existing driver.

I even hadn't looked into the code because this one needs a very good justification why it's a new driver rather than extension of the existing one.

--
With Best Regards,
Andy Shevchenko