On Tue, Oct 14, 2025 at 05:29:40PM -0500, Bjorn Helgaas wrote:
On Tue, Oct 14, 2025 at 11:58:42AM +0200, Lorenzo Pieralisi wrote:
quoted
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?
Sigh. "that implicitly means #msi-cells == 0", the `#` caused this.
Apologies.
Lorenzo
quoted
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.