Hi Andy, On Wed, 13 Sep 2023 14:17:30 +0300 Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> wrote: > On Tue, Sep 12, 2023 at 02:12:04PM -0500, Rob Herring wrote: > > On Mon, Sep 11, 2023 at 3:37 PM Andy Shevchenko > > <andriy.shevchenko@xxxxxxxxx> wrote: > > > On Tue, Aug 15, 2023 at 10:19:55AM -0700, Lizhi Hou wrote: > > ... > > > > Can you point out to the ACPI excerpt(s) of the description of anything related > > > to the device(s) in question? > > > > I don't understand what you are asking for. > > Through the email thread it was mentioned that this series was tested on the > ACPI enabled platform, Jonathan (IIRC) asked why do we need to have a shadow > DT for the something that ACPI already describes. That's why I'm trying to > understand if it's the case. and if so, how can we improve the approach. > Patches from Frank Rowand series [1] are needed to create an of_root_node if a DT was not provided by the firmware, bootloader, etc that run the kernel. [1]: https://lore.kernel.org/lkml/20220624034327.2542112-1-frowand.list@xxxxxxxxx/ Current Lizhi's series creates nodes from the PCI host node during the PCI enumeration. It creates PCI-PCI bridge and PCI device nodes. I use these series on an ACPI system. I need one more missing component: the node related to the PCI host bridge This was the purpose of Clement's work. This work was not sent upstream yet and I am working on it in order to have a full tree from the of_root to the PCI device ie: of_root <-- Frank Rowand series + of_host_pci_bridge <-- Clement's work + pci_bridge <-- Current Lizhi series + pci_bridge <-- Current Lizhi series ... + pci_dev <-- Current Lizhi series Hope that this status helped. Regards, Hervé -- Hervé Codina, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
