[PATCH v2 1/4] of/irq: Add msi-parent check to of_msi_xlate()

[Bjorn Helgaas]

On Tue, Oct 14, 2025 at 11:58:42AM +0200, Lorenzo Pieralisi wrote:
> In some legacy platforms the MSI controller for a PCI host bridge is
> identified by an msi-parent property whose phandle points at an MSI
> controller node with no #msi-cells property, that implicitly means

Looks like you intended to continue the sentence here?

> For such platforms, mapping a device ID and retrieving the MSI controller
> node becomes simply a matter of checking whether in the device hierarchy
> there is an msi-parent property pointing at an MSI controller node with
> such characteristics.
> 
> Add a helper function to of_msi_xlate() to check the msi-parent property in
> addition to msi-map and retrieve the MSI controller node (with a 1:1 ID
> deviceID-IN<->deviceID-OUT  mapping) to provide support for deviceID
> mapping and MSI controller node retrieval for such platforms.