Re: [PATCH v7 1/4] dt-bindings: pci: Strictly distinguish C0 from C1-C5

[Rob Herring (Arm)]

On Wed, 17 Jun 2026 18:01:28 +0200, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
> 
> Instead of using the ECAM registers as the first entry, strictly make a
> distinction between C0 and C1-C5. This is needed because otherwise the
> unit address doesn't match the first "reg" entry. We also cannot change
> the ordering of these nodes to follow the ECAM addresses because that
> would put them outside of their "control bus" hierarchy since the ECAM
> address space is a global one outside of any of the control busses.
> 
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> ---
> Changes in v7:
> - undo changes suggested by Sashiko, should've trust the dedicated tool
>   rather than the AI
> 
> Changes in v6:
> - add maxItems as suggested by Sashiko
> 
> Changes in v5:
> - rebase on top of v7.1-rc1, make it into a fix
> 
> Changes in v4:
> - ECAM is outside of the controller's region, so it cannot be the first
>   reg entry, otherwise we get warnings because it doesn't match the
>   unit-address, so revert back to oneOf construct
> 
> Changes in v2:
> - move ECAM region first and unify C0 vs. C1-C5
> - move unevaluatedProperties to right before the examples
> - add description to clarify the two types of controllers
> - add examples for C0 and C1-C5
> ---
>  .../bindings/pci/nvidia,tegra264-pcie.yaml         | 75 ++++++++++++++--------
>  1 file changed, 50 insertions(+), 25 deletions(-)
> 

Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>