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

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Message-ID: <CAHp75VdBRtpkA5zmpEZ+gdP=RwYaoTsyDBqvvO2w67T6-6kqMw@mail.gmail.com>
Date:   Tue, 9 Mar 2021 13:01:03 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
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>,
        grygorii.tertychnyi@...ca-geosystems.com,
        andrey.zhizhikin@...ca-geosystems.com,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Subject: Re: [PATCH 2/2] iio:magnetometer: Support for ST magnetic sensors

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