linux-kernel - Re: [PATCH] dt-bindings: iio: bmc150_magn: Document missing compatibles

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Date:   Mon, 22 Jun 2020 07:19:40 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: iio: bmc150_magn: Document missing
 compatibles

On Sat, Jun 20, 2020 at 04:40:49PM +0100, Jonathan Cameron wrote:
> On Wed, 17 Jun 2020 12:12:59 +0200
> Krzysztof Kozlowski <krzk@...nel.org> wrote:
> 
> > The driver supports also BMC156B and BMM150B so document the compatibles
> > for these devices.
> > 
> > Fixes: 9d75db36df14 ("iio: magn: Add support for BMM150 magnetometer")
> > Cc: <stable@...r.kernel.org>
> > Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> > 
> > ---
> > 
> > The fixes tag is not accurate but at least offer some backporting.
> 
> I'm not sure we generally bother backporting a missing section of binding
> documentation. Particularly as this doc isn't in yaml yet so it's not
> as though any automated checking is likely to be occurring.
> 
> Rob, any views on backporting this sort of missing id addition?
> 
> One side comment here is that the devices that are magnetometers only
> should never have had the _magn prefix in their compatibles. We only
> do that for devices in incorporating several sensors in one package
> (like the bmc150) where we have multiple drivers for the different
> sensors incorporated. We are too late to fix that now though.  It
> may make sense to mark the _magn variants deprecated though and
> add the ones without the _magn postfix.

I can add proper compatibles and mark these as deprecated but actually
the driver should not have additional compatibles in first place - all
devices are just compatible with bosch,bmc150.

Therefore I can just add one new compatible: "bosch,bmc156" and mark the
last two deprecated.

Best regards,
Krzysztof


> 
> > ---
> >  .../devicetree/bindings/iio/magnetometer/bmc150_magn.txt     | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/magnetometer/bmc150_magn.txt b/Documentation/devicetree/bindings/iio/magnetometer/bmc150_magn.txt
> > index fd5fca90fb39..7469073022db 100644
> > --- a/Documentation/devicetree/bindings/iio/magnetometer/bmc150_magn.txt
> > +++ b/Documentation/devicetree/bindings/iio/magnetometer/bmc150_magn.txt
> > @@ -4,7 +4,10 @@ http://ae-bst.resource.bosch.com/media/products/dokumente/bmc150/BST-BMC150-DS00
> >  
> >  Required properties:
> >  
> > -  - compatible : should be "bosch,bmc150_magn"
> > +  - compatible : should be one of:
> > +                 "bosch,bmc150_magn"
> > +                 "bosch,bmc156_magn"
> > +                 "bosch,bmm150_magn"
> >    - reg : the I2C address of the magnetometer
> >  
> >  Optional properties:
>