[PATCH v8 04/16] dt-bindings: imx6q-pcie: Add linux,pci-domain as required for iMX8MQ

[Rob Herring]

On Mon, 08 Jan 2024 18:21:33 -0500, Frank Li wrote:
> iMX8MQ have two pci controllers. Adds "linux,pci-domain" as required
> property 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 at nxp.com>
> ---
> 
> Notes:
>     Keep current to avoid DTB_CHECK warning. After these patch merged. Will add
>     linux,pci-domain in all dts file. So dt-binding can remove condition check
>     by soc.
> 
>     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 at kernel.org>