mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 06:08:08 +00:00
77e97abf12
Also removes random module and switches to new bcm2711 thermal driver. Boot tested on RPi 4B v1.1 4G. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
35 lines
1.7 KiB
Diff
35 lines
1.7 KiB
Diff
From afd6952c4dfb0d4945b496ef08b2f478d6f40097 Mon Sep 17 00:00:00 2001
|
|
From: Jacopo Mondi <jacopo@jmondi.org>
|
|
Date: Tue, 7 Apr 2020 17:21:55 +0200
|
|
Subject: [PATCH] Documentation: media: Update sub-device API intro
|
|
|
|
Update the V4L2 sub-device userspace API introduction to provide more
|
|
details on why complex devices might want to register devnodes for the
|
|
connected subdevices.
|
|
|
|
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
|
|
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
|
|
---
|
|
Documentation/media/kapi/v4l2-subdev.rst | 9 +++++++--
|
|
1 file changed, 7 insertions(+), 2 deletions(-)
|
|
|
|
--- a/Documentation/media/kapi/v4l2-subdev.rst
|
|
+++ b/Documentation/media/kapi/v4l2-subdev.rst
|
|
@@ -275,8 +275,13 @@ system the .unbind() method is called. A
|
|
V4L2 sub-device userspace API
|
|
-----------------------------
|
|
|
|
-Beside exposing a kernel API through the :c:type:`v4l2_subdev_ops` structure,
|
|
-V4L2 sub-devices can also be controlled directly by userspace applications.
|
|
+Bridge drivers traditionally expose one or multiple video nodes to userspace,
|
|
+and control subdevices through the :c:type:`v4l2_subdev_ops` operations in
|
|
+response to video node operations. This hides the complexity of the underlying
|
|
+hardware from applications. For complex devices, finer-grained control of the
|
|
+device than what the video nodes offer may be required. In those cases, bridge
|
|
+drivers that implement :ref:`the media controller API <media_controller>` may
|
|
+opt for making the subdevice operations directly accessible from userpace.
|
|
|
|
Device nodes named ``v4l-subdev``\ *X* can be created in ``/dev`` to access
|
|
sub-devices directly. If a sub-device supports direct userspace configuration
|