Re: [PATCH 2/2] dt-bindings: trivial-devices: Add a reference to spi-peripheral-props.yaml

[Rob Herring <robh@kernel.org>]

On Fri, Aug 30, 2024 at 04:17:02PM +0100, Conor Dooley wrote:
> On Fri, Aug 30, 2024 at 12:05:20PM -0300, Fabio Estevam wrote:
> > Hi Conor,
> > 
> > On Fri, Aug 30, 2024 at 11:14 AM Conor Dooley <conor@kernel.org> wrote:
> > 
> > > Since those don't come from spi-peripheral-props, not really the correct
> > > justification (although why they don't, I'm not sure). If you still saw
> > > dtbs_check complaints after the first patch, I maybe the controller
> > > schema is missing a reference to spi-controller.yaml?
> > 
> > I changed the first patch as suggested:
> > 
> > --- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
> > +++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
> > @@ -29,6 +29,10 @@ properties:
> >      description:
> >        Chip select used by the device.
> > 
> > +  spi-cpha: true
> > +
> > +  spi-cpol: true
> > +
> >    spi-cs-high:
> >      $ref: /schemas/types.yaml#/definitions/flag
> >      description:
> > 
> > spi-rockchip.yaml does reference spi-controller.yaml, but I still get
> > dtbs_check complaints after the first patch.
> > 
> > $ make CHECK_DTBS=y rockchip/rv1108-elgin-r1.dtb -j12
> >   UPD     include/config/kernel.release
> >   SCHEMA  Documentation/devicetree/bindings/processed-schema.json
> >   DTC [C] arch/arm/boot/dts/rockchip/rv1108-elgin-r1.dtb
> > /home/fabio/linux-next/arch/arm/boot/dts/rockchip/rv1108-elgin-r1.dtb:
> > display@0: 'spi-cpha', 'spi-cpol' do not match any of the regexes:
> > 'pinctrl-[0-9]+'
> > from schema $id: http://devicetree.org/schemas/trivial-devices.yaml#
> > 
> > I would appreciate some suggestions on how to fix this warning.
> 
> Ah, I think I suggested something garbage, because I misread the diff,
> as my quoted mail evidences. I was really trying to suggest putting
> spi-cpha: true
> spi-cpol: true
> in trivial-devices.yaml, but I didn't notice that the patch was to
> spi-peripheral-props rather than trivial-devices. These properties are
> defined (for reasons I don't quite understand) in spi-controller.yaml
> and applied to children of the controller node by that binding and I
> wanted to avoid the redefinition.

I steered Fabio wrong...

I think we originally had these in spi-peripheral-props, but then 
decided they are properties of the device, not the controller. These 
properties should really only be needed if the device supports different 
modes. If what a device supports is fixed, then that can be implicit.

There's one other case I see with "dh,dhcom-board". So I guess add 
spi-cpha and spi-cpol directly to trivial-devices.yaml.

Rob