linux-kernel - Re: [PATCH] dt-bindings: iio: st-sensors: Add IIS2MDC magnetometer

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Message-ID: <20240221191644.5r3ylr5w3cnfnrzj@pengutronix.de>
Date: Wed, 21 Feb 2024 20:16:44 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Conor Dooley <conor@...nel.org>
Cc: jic23@...nel.org, lars@...afoo.de, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	denis.ciocca@...com, linus.walleij@...aro.org,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH] dt-bindings: iio: st-sensors: Add IIS2MDC magnetometer

On 24-02-21, Conor Dooley wrote:
> On Wed, Feb 21, 2024 at 06:58:10PM +0100, Marco Felsch wrote:
> > Add the iis2mdc magnetometer support which is equivalent to the lis2mdl.
> > 
> > Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> > ---
> >  Documentation/devicetree/bindings/iio/st,st-sensors.yaml | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/st,st-sensors.yaml b/Documentation/devicetree/bindings/iio/st,st-sensors.yaml
> > index fff7e3d83a02..ee593c8bbb65 100644
> > --- a/Documentation/devicetree/bindings/iio/st,st-sensors.yaml
> > +++ b/Documentation/devicetree/bindings/iio/st,st-sensors.yaml
> > @@ -64,6 +64,7 @@ properties:
> >            - st,lsm9ds0-gyro
> >        - description: STMicroelectronics Magnetometers
> >          enum:
> > +          - st,iis2mdc
> 
> Without a fallback compatible to the equivilent device, how does a
> driver bind to this device?

I skimed the datasheets and the driver already handles this binding
exactly the same as the st,lis2mdl, so my assumption is they do match.

Why do I you think we need a fallback compatible here?

Regards,
  Marco

> 
> Cheers,
> Conor.
> 
> >            - st,lis2mdl
> >            - st,lis3mdl-magn
> >            - st,lsm303agr-magn
> > -- 
> > 2.39.2
> >