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| author | Lizhi Hou <lizhi.hou@amd.com> | 2023-08-15 10:19:57 -0700 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2023-08-22 14:56:09 -0500 |
| commit | 407d1a51921e9f28c1bcec647c2205925bd1fdab (patch) | |
| tree | e35e09b92753fb85521384bf789976141765e654 /drivers/pci/Kconfig | |
| parent | b544fc2b8606d718d0cc788ff2ea2492871df488 (diff) | |
PCI: Create device tree node for bridge
The PCI endpoint device such as Xilinx Alveo PCI card maps the register
spaces from multiple hardware peripherals to its PCI BAR. Normally,
the PCI core discovers devices and BARs using the PCI enumeration process.
There is no infrastructure to discover the hardware peripherals that are
present in a PCI device, and which can be accessed through the PCI BARs.
Apparently, the device tree framework requires a device tree node for the
PCI device. Thus, it can generate the device tree nodes for hardware
peripherals underneath. Because PCI is self discoverable bus, there might
not be a device tree node created for PCI devices. Furthermore, if the PCI
device is hot pluggable, when it is plugged in, the device tree nodes for
its parent bridges are required. Add support to generate device tree node
for PCI bridges.
Add an of_pci_make_dev_node() interface that can be used to create device
tree node for PCI devices.
Add a PCI_DYNAMIC_OF_NODES config option. When the option is turned on,
the kernel will generate device tree nodes for PCI bridges unconditionally.
Initially, add the basic properties for the dynamically generated device
tree nodes which include #address-cells, #size-cells, device_type,
compatible, ranges, reg.
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Link: https://lore.kernel.org/r/1692120000-46900-3-git-send-email-lizhi.hou@amd.com
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/pci/Kconfig')
| -rw-r--r-- | drivers/pci/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 3c07d8d214b3..49bd09c7dd0a 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -194,6 +194,18 @@ config PCI_HYPERV The PCI device frontend driver allows the kernel to import arbitrary PCI devices from a PCI backend to support PCI driver domains. +config PCI_DYNAMIC_OF_NODES + bool "Create Device tree nodes for PCI devices" + depends on OF + select OF_DYNAMIC + help + This option enables support for generating device tree nodes for some + PCI devices. Thus, the driver of this kind can load and overlay + flattened device tree for its downstream devices. + + Once this option is selected, the device tree nodes will be generated + for all PCI bridges. + choice prompt "PCI Express hierarchy optimization setting" default PCIE_BUS_DEFAULT |