linux-kernel - [PATCH] checkpatch: skip vendor-prefix check for pciNNNN DT compatibles

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Message-Id: <20251210073812.1380803-1-yingying.tang@oss.qualcomm.com>
Date: Wed, 10 Dec 2025 15:38:12 +0800
From: Yingying Tang <yingying.tang@....qualcomm.com>
To: apw@...onical.com, joe@...ches.com, dwaipayanray1@...il.com,
        lukas.bulwahn@...il.com, dmitry.baryshkov@....qualcomm.com,
        linux-kernel@...r.kernel.org, tingweiz@....qualcomm.com,
        yijiyang@....qualcomm.com, yintang@....qualcomm.com
Cc: Yingying Tang <yingying.tang@....qualcomm.com>
Subject: [PATCH] checkpatch: skip vendor-prefix check for pciNNNN DT compatibles

Some DeviceTree compatibles legitimately use PCI Vendor/Device IDs,
e.g. "pci17cb,1107" (WCN7850/ath12k). These are documented in binding
YAML files and validated by dt-schema, but checkpatch currently treats
the substring before the comma as a vendor prefix that must be listed
in vendor-prefixes.yaml. That yields false warnings like:

  WARNING: DT compatible string vendor "pci17cb" appears un-documented

Skip vendor-prefix documentation check when the extracted prefix matches
'pci'. Normal vendor prefixes remain checked.

Signed-off-by: Yingying Tang <yingying.tang@....qualcomm.com>
---
 scripts/checkpatch.pl | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c0250244cf7a..b1eea8f532a0 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3751,6 +3751,10 @@ sub process {
 
 				next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
 				my $vendor = $1;
+				if ($vendor =~ /^pci[0-9a-fA-F]{4}$/) {
+					# Skip vendor-prefix documentation check for pciNNNN
+					next;
+				}
 				`grep -Eq "\\"\\^\Q$vendor\E,\\.\\*\\":" $vp_file`;
 				if ( $? >> 8 ) {
 					WARN("UNDOCUMENTED_DT_STRING",
-- 
2.25.1