linux-kernel - Re: [PATCH v2] iio: accel: bmc150: Check for a second ACPI device for BOSC0200

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Date:   Tue, 30 Jan 2018 18:46:25 +0000
From:   Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Steve Presser <steve@...ssers.name>,
        Hans de Goede <hdegoede@...hat.com>,
        Hartmut Knaack <knaack.h@....de>,
        Jeremy Cline <jeremy@...ine.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Lars Kellogg-Stedman <lars@...bit.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Wolfram Sang <wsa@...-dreams.de>, linux-iio@...r.kernel.org
Subject: Re: [PATCH v2] iio: accel: bmc150: Check for a second ACPI device
 for BOSC0200

On Tue, 30 Jan 2018 18:33:43 +0000
Jonathan Cameron <jic23@...23.retrosnub.co.uk> wrote:

> On Tue, 30 Jan 2018 20:08:19 +0200
> Andy Shevchenko <andy.shevchenko@...il.com> wrote:
> 
> > On Tue, Jan 30, 2018 at 7:38 PM, Andy Shevchenko
> > <andy.shevchenko@...il.com> wrote:  
> > > On Tue, Jan 30, 2018 at 7:25 PM, Steve Presser <steve@...ssers.name> wrote:    
> > >> Andy,
> > >>
> > >> Where did the assertion the second device is a magnetometer come from? Just
> > >> the data sheet?    
> > >
> > > Yep. See chapter 8.2. Isn't enough proof? Or you believe in two
> > > accelerometers with off-by-one conflicting address on a cheap laptop
> > > with left unused two magnetometers on the same time?
> > >
> > > And we have a driver for magnetometer separately.
> > >
> > > So, it looks like we need to move ACPI ID to a new "kinda I2C mfd" IIO
> > > driver under drivers/iio/imu/bmc150_i2c.c    
> > 
> > Even Kconfig for one of the driver states so.
> > 
> > Looking more to it, I think the patch should be reverted and new
> > driver is created instead.  
> 
> Whilst the question is still open I have dropped the patch.
> Was not yet in a non rebasing tree (just in a build test one)
> so fine to drop it.

Should have said this isn't the final decision or anything, but
whilst there are open questions we should take the time to sure
of the answer!

> 
> > 
> > I'm on it.
> >   
> > >> Steve
> > >>
> > >>
> > >> On Tue, Jan 30, 2018, 12:05 PM Andy Shevchenko <andy.shevchenko@...il.com>
> > >> wrote:    
> > >>>
> > >>> On Tue, Jan 30, 2018 at 6:40 PM, Andy Shevchenko
> > >>> <andy.shevchenko@...il.com> wrote:    
> > >>> > On Tue, Jan 30, 2018 at 6:01 PM, Jonathan Cameron
> > >>> > <Jonathan.Cameron@...wei.com> wrote:    
> > >>> >> On Mon, 29 Jan 2018 16:07:02 +0200
> > >>> >> Andy Shevchenko <andy.shevchenko@...il.com> wrote:    
> > >>> >    
> > >>> >>> > But that would take much longer.  Feel free to propose it and a
> > >>> >>> > patch
> > >>> >>> > removing the ifdef fun if you like!    
> > >>> >    
> > >>> >>> Where can I see the patch?    
> > >>> >    
> > >>> >> Doh. I clearly forgot to push out.  Should be able to push to
> > >>> >> iio.git on kernel.org later.    
> > >>> >
> > >>> > Thanks, I can see it now.
> > >>> >
> > >>> > This patch almost wrong. Not by functionality it brings, but by style.    
> > >>>
> > >>> Oy vey, the second device is *not* accelerometer, it is a magnetometer
> > >>> [1].
> > >>>
> > >>> [1]: https://www.mouser.com/ds/2/783/BST-BMC150-DS000-04-786477.pdf
> > >>>    
> > >>> > I'll send soon a series of fixes to the driver (compile tested only)
> > >>> > to provide my view on the matters.
> > >>> >
> > >>> > P.S. In the future (I have some kind of deja vu I have told this
> > >>> > already to someone), please, Cc one or more of Rafael, Mika and/or me
> > >>> > for ACPI matters.    
> > >>>
> > >>> --
> > >>> With Best Regards,
> > >>> Andy Shevchenko    
> > >
> > >
> > >
> > > --
> > > With Best Regards,
> > > Andy Shevchenko    
> > 
> > 
> >   
> 
> --
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