Re: [PATCH v2 01/16] dt-bindings: media: fsl-pxp: convert to yaml

[Michael Tretter <m.tretter@pengutronix.de>]

On Fri, 13 Jan 2023 12:56:12 +0100, Krzysztof Kozlowski wrote:
> On 13/01/2023 10:54, Michael Tretter wrote:
> > Convert the bindings of the Freescale Pixel Pipeline to YAML.
> > 
> > The conversion drops the previously listed compatibles for several SoCs.
> > It is unclear, if the PXP on these SoCs is compatible to any of the PXPs
> > on the existing SoCs and would allow to reuse the already defined
> > compatibles. The missing compatibles should be brought back when the
> > support for the PXP on these SoCs is added.
> > 
> > Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
> > ---
> > Changelog:
> > 
> > v2:
> > 
> > - add fsl,imx6sll-pxp and fsl,imx6sx-pxp compatibles
> > - restrict number of interrupts per variant
> > - cleanup syntax
> > ---
> >  .../devicetree/bindings/media/fsl,imx6ull-pxp.yaml | 82 ++++++++++++++++++++++
> >  .../devicetree/bindings/media/fsl-pxp.txt          | 26 -------
> >  2 files changed, 82 insertions(+), 26 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/media/fsl,imx6ull-pxp.yaml b/Documentation/devicetree/bindings/media/fsl,imx6ull-pxp.yaml
> > new file mode 100644
> > index 000000000000..c1232689a261
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/fsl,imx6ull-pxp.yaml
> > @@ -0,0 +1,82 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/fsl,imx6ull-pxp.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Freescale Pixel Pipeline
> > +
> > +maintainers:
> > +  - Philipp Zabel <p.zabel@pengutronix.de>
> > +  - Michael Tretter <m.tretter@pengutronix.de>
> > +
> > +description:
> > +  The Pixel Pipeline (PXP) is a memory-to-memory graphics processing engine
> > +  that supports scaling, colorspace conversion, alpha blending, rotation, and
> > +  pixel conversion via lookup table. Different versions are present on various
> > +  i.MX SoCs from i.MX23 to i.MX7.
> > +
> > +properties:
> > +  compatible:
> > +    oneOf:
> > +      - const: fsl,imx6ul-pxp
> > +      - const: fsl,imx6ull-pxp
> > +      - const: fsl,imx7d-pxp
> 
> These three are an enum.

These are alternatives to the 'items:' entry below.

Are you suggesting to use the following statement?

oneOf:
  - enum:
      - fsl,imx6ul-pxp
      - fsl,imx6ull-pxp
      - fsl,imx7d-pxp
  - items:
      - enum:
          - fsl,imx6sll-pxp
          - fsl,imx6sx-pxp

Why is this better than the one that I used?

> 
> > +      - items:
> > +          - enum:
> > +              - fsl,imx6sll-pxp
> > +              - fsl,imx6sx-pxp
> > +          - const: fsl,imx6ull-pxp
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    minItems: 1
> > +    maxItems: 2
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  clock-names:
> > +    const: axi
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +  - clock-names
> > +
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - fsl,imx6sx-pxp
> > +    then:
> > +      properties:
> > +        interrupts:
> > +          numItems: 1
> 
> That's not correct syntax... I am surprised that it works. Did you test
> the bindings?

I copied this syntax from renesas,wdt.yaml and ran

	make ARCH=arm dtbs_check DT_SCHEMA_FILES=fsl,imx6ull-pxp.yaml

with SOC_IMX7D=y, SOC_IMX6UL=y, SOC_IMX6SLL=y, and SOC_IMX6SX=y. The latter
two were not enabled in the v1, which is why it didn't catch the missing
compatibles.

On a closer look, I just saw that the checker ignored the schema due to the
incorrect syntax and didn't produce any further errors. With the syntax fixed,
the checker now produces also a few more errors about power-domains, which I
will fix in v3.

Is this syntax correct?

allOf:
  - if:
      properties:
        compatible:
          contains:
            enum:
              - fsl,imx6sx-pxp
    then:
      properties:
        interrupts:
          minItems: 1
          maxItems: 1
    else:
      properties:
        interrupts:
          minItems: 2
          maxItems: 2

Michael