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[V11,3/5] PCI: Add quirks to generate device tree node for Xilinx Alveo U50

Message ID 1690323318-6103-4-git-send-email-lizhi.hou@amd.com (mailing list archive)
State Superseded
Delegated to: Bjorn Helgaas
Headers show
Series Generate device tree node for pci devices | expand

Commit Message

Lizhi Hou July 25, 2023, 10:15 p.m. UTC 
The Xilinx Alveo U50 PCI card exposes multiple hardware peripherals on
its PCI BAR. The card firmware provides a flattened device tree to
describe the hardware peripherals on its BARs. This allows U50 driver to
load the flattened device tree and generate the device tree node for
hardware peripherals underneath.

To generate device tree node for U50 card, add PCI quirks to call
of_pci_make_dev_node() for U50.

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
---
 drivers/pci/quirks.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 321156ca273d..6c0e7b6bbdd1 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6138,3 +6138,14 @@  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2d, dpc_log_size);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2f, dpc_log_size);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a31, dpc_log_size);
 #endif
+
+/*
+ * For a PCI device with multiple downstream devices, its driver may use
+ * a flattened device tree to describe the downstream devices.
+ * To overlay the flattened device tree, the PCI device and all its ancestor
+ * devices need to have device tree nodes on system base device tree. Thus,
+ * before driver probing, it might need to add a device tree node as the final
+ * fixup.
+ */
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5020, of_pci_make_dev_node);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5021, of_pci_make_dev_node);