[PATCH v7 1/4] Documentation/gpu: Clarify format of driver-specific fidnfo keys

["Adrián Larumbe" <adrian.larumbe@collabora.com>]

This change reflects de facto usage by amdgpu, as exemplified by commit
d6530c33a978 ("drm/amdgpu: expose more memory stats in fdinfo").

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Cc: Tvrtko Ursulin <tursulin@ursulin.net>
---
 Documentation/gpu/drm-usage-stats.rst | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/gpu/drm-usage-stats.rst b/Documentation/gpu/drm-usage-stats.rst
index 2717cb2a597e..2b5393ed7692 100644
--- a/Documentation/gpu/drm-usage-stats.rst
+++ b/Documentation/gpu/drm-usage-stats.rst
@@ -21,7 +21,10 @@ File format specification
 
 - File shall contain one key value pair per one line of text.
 - Colon character (`:`) must be used to delimit keys and values.
-- All keys shall be prefixed with `drm-`.
+- All standardised keys shall be prefixed with `drm-`.
+- Driver-specific keys shall be prefixed with `driver_name-`, where
+  driver_name should ideally be the same as the `name` field in
+  `struct drm_driver`, although this is not mandatory.
 - Whitespace between the delimiter and first non-whitespace character shall be
   ignored when parsing.
 - Keys are not allowed to contain whitespace characters.
-- 
2.47.1