On Saturday 13 November 2021 12:31:06 Pali Rohár wrote:

On Friday 12 November 2021 14:56:26 Rob Herring wrote:

quoted

The only
versioning we have ATM is the kernel requires a minimum version of
dtschema (which we'll have to bump for all this).

We could have something like:

old-pci-bridge.yaml:
  allOf:
    - $ref: pci-host-bridge.yaml#
    - $ref: pcie-port.yaml#

new-pci-bridge.yaml:
  allOf:
    - $ref: pci-host-bridge.yaml#
  properties:
    pci@0:
      $ref: pcie-port.yaml#

And then both of the above schemas will have $ref to a pci-bridge.yaml
schema which should be most of pci-bus.yaml. linux,pci-domain and
dma-ranges? go to pci-host-bridge.yaml. max-link-speed, num-lanes,
reset-gpios, slot-power-limit-milliwatt, and the pending supply
additions (Broadcom) go to pcie-port.yaml.

This looks like a nice solution.

I would propose just one other thing: Do not allow new kernel drivers
to use old-pci-bridge.yaml schema, so new drivers would not use old
"deprecated" APIs...

So should I prepare some schemas and send it for review via github pull
request mechanism? (I'm not sure how is that github project related to
kernel DTS bindings and how is reviewing on it going...)

I prepared something for discussion:
https://github.com/devicetree-org/dt-schema/pull/64