[PATCH v6 2/7] dt-bindings: PCI: ti,am65: Extend for use with PVU

[Krzysztof Kozlowski]

On Mon, Sep 09, 2024 at 07:03:55PM +0200, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka at siemens.com>
> 
> The PVU on the AM65 SoC is capable of restricting DMA from PCIe devices
> to specific regions of host memory. Add the optional property
> "memory-regions" to point to such regions of memory when PVU is used.
> 
> Since the PVU deals with system physical addresses, utilizing the PVU
> with PCIe devices also requires setting up the VMAP registers to map the
> Requester ID of the PCIe device to the CBA Virtual ID, which in turn is
> mapped to the system physical address. Hence, describe the VMAP
> registers which are optional unless the PVU shall be used for PCIe.
 
> +  memory-region:
> +    maxItems: 1
> +    description: |
> +      phandle to a restricted DMA pool to be used for all devices behind
> +      this controller. The regions should be defined according to
> +      reserved-memory/shared-dma-pool.yaml.
> +      Note that enforcement via the PVU will only be available to
> +      ti,am654-pcie-rc devices.
> +
>  required:
>    - compatible
>    - reg
> @@ -89,6 +102,13 @@ then:
>      - power-domains
>      - msi-map
>      - num-viewport

You could add here schema expressing dependency, e.g.
if:
  properties:
    required:
      - memory-region
then:
  properties:
    reg:
      minItems: 6
    reg-names:
      minItems: 6

If I got your commit msg correctly.

Anyway, it's fine as is.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>

Best regards,
Krzysztof