This hasn't yet been added to the linux kernel tree, so for purposes
of this RFC just add it locally.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 include/standard-headers/linux/pci_regs.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/standard-headers/linux/pci_regs.h b/include/standard-headers/linux/pci_regs.h
index 27164769d1..224b52e62b 100644
--- a/include/standard-headers/linux/pci_regs.h
+++ b/include/standard-headers/linux/pci_regs.h
@@ -709,7 +709,8 @@
 #define PCI_EXT_CAP_ID_DPC	0x1D	/* Downstream Port Containment */
 #define PCI_EXT_CAP_ID_L1SS	0x1E	/* L1 PM Substates */
 #define PCI_EXT_CAP_ID_PTM	0x1F	/* Precision Time Measurement */
-#define PCI_EXT_CAP_ID_MAX	PCI_EXT_CAP_ID_PTM
+#define PCI_EXT_CAP_ID_DVSEC	0x23    /* Designated Vendor-Specific */
+#define PCI_EXT_CAP_ID_MAX	PCI_EXT_CAP_ID_DVSEC
 
 #define PCI_EXT_CAP_DSN_SIZEOF	12
 #define PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF 40
-- 
2.20.1