On Mon, 14 Apr 2025 14:30:58 -0400, Frank Li wrote: > Document the use of (msi|iommu)-map for PCI Endpoint (EP) controllers, > which can use MSI as a doorbell mechanism. Each EP controller can support > up to 8 physical functions and 65,536 virtual functions. > > Define how to construct device IDs using function bits [2:0] and virtual > function index bits [31:3], enabling (msi|iommu)-map to associate each > child device with a specific (msi|iommu)-specifier. > > The EP cannot rely on PCI Requester ID (RID) because the RID is determined > by the PCI topology of the host system. Since the EP may be connected to > different PCI hosts, the RID can vary between systems and is therefore not > a reliable identifier. > > Signed-off-by: Frank Li <frank...@nxp.com> > --- > Change from v17 to v18 > - mask max value should 0x7ffff > - order according to property name > > Change from v16 to v17 > - new patch > --- > Documentation/devicetree/bindings/pci/pci-ep.yaml | 68 > +++++++++++++++++++++++ > 1 file changed, 68 insertions(+) >
Reviewed-by: Rob Herring (Arm) <r...@kernel.org>
