tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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PCI: Establish document for PCI host bridge sysfs attributes

In preparation for adding more host bridge sysfs attributes, document the
existing naming format and 'firmware_node' attribute.

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20251031212902.2256310-7-dan.j.williams@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Dan Williams 290b633a c0c1262f

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Documentation/ABI/testing/sysfs-devices-pci-host-bridge
··· 1 + What: /sys/devices/pciDDDD:BB 2 + /sys/devices/.../pciDDDD:BB 3 + Contact: linux-pci@vger.kernel.org 4 + Description: 5 + A PCI host bridge device parents a PCI bus device topology. PCI 6 + controllers may also parent host bridges. The DDDD:BB format 7 + conveys the PCI domain (ACPI segment) number and root bus number 8 + (in hexadecimal) of the host bridge. Note that the domain number 9 + may be larger than the 16-bits that the "DDDD" format implies 10 + for emulated host-bridges. 11 + 12 + What: pciDDDD:BB/firmware_node 13 + Contact: linux-pci@vger.kernel.org 14 + Description: 15 + (RO) Symlink to the platform firmware device object "companion" 16 + of the host bridge. For example, an ACPI device with an _HID of 17 + PNP0A08 (/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00). See 18 + /sys/devices/pciDDDD:BB entry for details about the DDDD:BB 19 + format.
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MAINTAINERS
··· 19910 19910 B: https://bugzilla.kernel.org 19911 19911 C: irc://irc.oftc.net/linux-pci 19912 19912 T: git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git 19913 + F: Documentation/ABI/testing/sysfs-devices-pci-host-bridge 19913 19914 F: Documentation/PCI/ 19914 19915 F: Documentation/devicetree/bindings/pci/ 19915 19916 F: arch/x86/kernel/early-quirks.c