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Subject[PATCH] PCI: create revision file in sysfs
From: Emil Velikov <>

Currently the revision isn't available via sysfs/libudev thus if one
wants to know the value they need to read through the config file.

This in itself wakes/powers up the device, causing unwanted delay
since it can be quite costly.

Expose the revision as a separate file, just like we do for the device,
vendor, their subsystem version and class.

Cc: Jammy Zhou <>
Cc: Michel Dänzer <>
Cc: Bjorn Helgaas <>
Signed-off-by: Emil Velikov <>
Gents, I'm not subscribed to the mailing list so please keep me in the
CC chain.

drivers/pci/pci-sysfs.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index bcd10c7..0666287 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -50,6 +50,7 @@ pci_config_attr(vendor, "0x%04x\n");
pci_config_attr(device, "0x%04x\n");
pci_config_attr(subsystem_vendor, "0x%04x\n");
pci_config_attr(subsystem_device, "0x%04x\n");
+pci_config_attr(revision, "0x%02x\n");
pci_config_attr(class, "0x%06x\n");
pci_config_attr(irq, "%u\n");

@@ -568,6 +569,7 @@ static struct attribute *pci_dev_attrs[] = {
+ &dev_attr_revision.attr,
 \ /
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