linux-kernel - Re: [v7 1/3] dt-bindings: i2c: Add Maxim MAX735x/MAX736x variants

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Date:   Wed, 6 Apr 2022 13:43:19 -0500
From:   Rob Herring <robh@...nel.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Patrick Rudolph <patrick.rudolph@...ements.com>,
        Peter Rosin <peda@...ntia.se>, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [v7 1/3] dt-bindings: i2c: Add Maxim MAX735x/MAX736x variants

On Tue, Apr 05, 2022 at 04:46:34PM +0300, Laurent Pinchart wrote:
> Hi Patrick,
> 
> Thank you for the patch.
> 
> On Tue, Apr 05, 2022 at 02:05:49PM +0200, Patrick Rudolph wrote:
> > Update the pca954x bindings to add support for the Maxim MAX735x/MAX736x
> > chips. The functionality will be provided by the exisintg pca954x driver.
> > 
> > While on it make the interrupts support conditionally as not all of the
> > existing chips have interrupts.
> > 
> > For chips that are powered off by default add an optional regulator
> > called vdd-supply.
> > 
> > Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> > ---
> >  .../bindings/i2c/i2c-mux-pca954x.yaml         | 44 ++++++++++++++-----
> >  1 file changed, 34 insertions(+), 10 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> > index 9f1726d0356b..132c3e54e7ab 100644
> > --- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> > +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
> > @@ -4,21 +4,48 @@
> >  $id: http://devicetree.org/schemas/i2c/i2c-mux-pca954x.yaml#
> >  $schema: http://devicetree.org/meta-schemas/core.yaml#
> >  
> > -title: NXP PCA954x I2C bus switch
> > +title: NXP PCA954x I2C and compatible bus switches
> >  
> >  maintainers:
> >    - Laurent Pinchart <laurent.pinchart@...asonboard.com>
> >  
> >  description:
> > -  The binding supports NXP PCA954x and PCA984x I2C mux/switch devices.
> > +  The binding supports NXP PCA954x and PCA984x I2C mux/switch devices,
> > +  and the Maxim MAX735x and MAX736x I2C mux/switch devices.
> >  
> >  allOf:
> >    - $ref: /schemas/i2c/i2c-mux.yaml#
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - maxim,max7367
> > +              - maxim,max7369
> > +              - nxp,pca9542
> > +              - nxp,pca9543
> > +              - nxp,pca9544
> > +              - nxp,pca9545
> > +    then:
> > +      properties:
> > +        interrupts:
> > +          maxItems: 1
> > +
> > +        "#interrupt-cells":
> > +          const: 2
> > +
> > +        interrupt-controller: true
> 
> It feels a bit out of place to have those properties listed before the
> main "properties" property, but we can only have a sincel allOf. I
> wonder if the i2c-mux schema could be selected automatically based on
> node name, but that's out of scope for this patch.

Yes, just move the allOf below 'properties'
 
> I thought it was more customary to define properties in the main
> "properties" property, and then have

Yes, please do.

Rob