Re: [PATCH v7 04/16] dt-bindings: imx6q-pcie: Add linux,pci-domain as required for iMX8MQ

Rob Herring
2024-01-09T03:49:54Z

On Wed, 27 Dec 2023 13:27:15 -0500, Frank Li wrote:
> iMX8MQ have two pci controllers. Adds "linux,pci-domain" as required
> proptery for iMX8MQ to indicate pci controller index.
>
> This adjustment paves the way for eliminating the hardcoded check on the
> base register for acquiring the controller_id.
>
> ...
> if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
> imx6_pcie->controller_id = 1;
> ...
>
> The controller_id is crucial and utilized for certain register bit
> positions. It must align precisely with the controller index in the SoC.
> An auto-incremented ID don't fit this case. The DTS or fuse configurations
> may deactivate specific PCI controllers.
>
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
>
> Notes:
> Change from v5 to v6
> - rework commit message to explain why need required and why auto increase
> id not work
>
> Change from v4 to v5
> - new patch at v5
>
> .../bindings/pci/fsl,imx6q-pcie-common.yaml | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>

Reviewed-by: Rob Herring <robh@kernel.org>