RE: [PATCH v3] PCI: Xilinx-NWL-PCIe: Added support for Xilinx NWL PCIe Host Controller

[Bharat Kumar Gogada]

> >> +struct nwl_msi {                  /* struct nwl_msi - MSI information
> */
> >> +  struct msi_controller chip;     /* chip: MSI controller */
> >
> >> We're moving away from msi_controller altogether, as the kernel now
> >> has all the necessary infrastructure to do this properly.
> >
> > Our current GIC version does not have separate msi controller (we are
> > not using GICv2m or GICv3), so is it necessary to have separate msi
> > controller node ? Please give me clarity on this.
>
> This has nothing to do with the version of the GIC you are using (XGene
> doesn't have GICv2m or v3 either). This is about reducing code duplication
> and having something that we can maintain. See also
> https://lkml.org/lkml/2015/9/20/193 for yet another example.
>
> I still plan to kill msi_controller, and I'd like to avoid more dependencies with
> it. MSI domains are the way to do it.
>
Sorry previously I haven't configured my email client properly so resending.

Since we don't have separate MSI controller, and our PCIe controller is handling MSI, is it necessary to create a separate MSI controller node because we don't have any 'reg' space.
Please let me know whether we require a separate msi file as suggested in your previous comments to separate MSI controller and PCIE controller in two files, if we don't have separate node.
If we do not need a separate node do we need to embed MSI controller child node  in PCIe controller node itself, and what properties does this child node will require other than 'interrupts'.

Bharat
> Thanks,
>
>       M.
> --
> Jazz is not dead. It just smells funny...


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