[PATCH] docs/sphinx: More depth in the rtd sidebar toc

[Daniel Vetter <daniel.vetter@xxxxxxxx>]

We love to nest our documenation for good structure, but that means
the table of contents needs to keep up or you can't navigate them.

Realized this trying to find the drm property documentation, which
with some shuffling around disappeared. Why I didn't realize we can do
this earlier, no idea.

Since the relevant parts of the toc are only loaded if you're in the
right .html file there's no harm in going all the way to unlimited.

Note that this has no impact on the classic theme (which doesn't have
the sidebar) nor on the various :toctree: rendered inline in the
output.

Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
---
 Documentation/conf.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/conf.py b/Documentation/conf.py
index 934727e23e0e..5dc141c66726 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -240,6 +240,10 @@ if html_theme == 'sphinx_rtd_theme' or html_theme == 'sphinx_rtd_dark_mode':
                 # Add color-specific RTD normal mode
                 html_css_files.append('theme_rtd_colors.css')
 
+        html_theme_options = {
+            'navigation_depth': -1,
+        }
+
     except ImportError:
         html_theme = 'classic'
 
-- 
2.37.2