[PATCH] drm: Document requirements for driver-specific KMS props in new drivers

[Sebastian Wick <sebastian.wick@redhat.com>]

When extending support for a driver-specific KMS property to additional
drivers, we should apply all the requirements for new properties and
make sure the semantics are the same and documented.

Signed-off-by: Sebastian Wick <sebastian.wick@redhat.com>
---
 Documentation/gpu/drm-kms.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
index 13d3627d8bc0..afa10a28035f 100644
--- a/Documentation/gpu/drm-kms.rst
+++ b/Documentation/gpu/drm-kms.rst
@@ -496,6 +496,11 @@ addition to the one mentioned above:
 
 * An IGT test must be submitted where reasonable.
 
+For historical reasons, non-standard, driver-specific properties exist. If a KMS
+driver wants to add support for one of those properties, the requirements for
+new properties apply where possible. Additionally, the documented behavior must
+match the de facto semantics of the existing property to ensure compatibility.
+
 Property Types and Blob Property Support
 ----------------------------------------
 
-- 
2.43.0