Linux kernel stable tree https://git.rulkc.org/pub/scm/linux/kernel/git/stable/linux.git/atom?h=master 2026-08-12T19:20:48+00:00 2026-08-12T19:20:48+00:00 Manivannan Sadhasivam manivannan.sadhasivam@oss.qualcomm.com 2026-08-03T07:25:24+00:00 urn:sha1:1af156149d9a7de8e6cc44f09f4150cb677bf1bf Writing a PCI Host Controller driver requires bringing up the Root Complex hardware and registering it with the PCI core in a specific sequence. Add a guide describing these steps to help developers write new drivers. It covers the Root Complex topology and enumeration, and walks through the driver flow, including resource setup, Configuration Space accessors, address translation, interrupt handling, Link training, power management, shutdown and removal, using standard guidelines/best practices. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://patch.msgid.link/20260803-pci-doc-v1-1-2814f8672cad@oss.qualcomm.com 2025-05-21T12:02:59+00:00 Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com 2025-05-07T10:09:47+00:00 urn:sha1:003d15b30f3690b14315822439edc2c3f823c6cd Renesas R-Car V4H (r8a779g0) has PCIe controller, and it requires specific firmware downloading. So, add a document about the firmware how to get. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> [kwilczynski: commit log, refactor the document content and then add this new file to a correct index under the top-level PCI documentation] Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Link: https://lore.kernel.org/r/20250507100947.608875-1-yoshihiro.shimoda.uh@renesas.com