On Thu, 21 Sep 2023 07:20:46 -0500 Rob Herring <robh@xxxxxxxxxx> wrote: > On Mon, Sep 18, 2023 at 2:17 AM Andy Shevchenko > <andriy.shevchenko@xxxxxxxxx> wrote: > > > > On Fri, Sep 15, 2023 at 07:30:08PM +0200, Herve Codina wrote: > > > 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. > > > > Thanks for the explanation! I suppose it's better to have three series combined > > into one and being sent with a better cover letter to explain all this. > > You can go back (years now) and see that. I asked for this to be split > up into manageable chunks and not solve multiple problems at once. No > point in trying to do DT on top of ACPI if DT on top of DT doesn't > work first. I agree. Hervé > > Rob -- Hervé Codina, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
