diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/driver-api/media/v4l2-clocks.rst | 31 | ||||
| -rw-r--r-- | Documentation/driver-api/media/v4l2-core.rst | 1 |
2 files changed, 0 insertions, 32 deletions
diff --git a/Documentation/driver-api/media/v4l2-clocks.rst b/Documentation/driver-api/media/v4l2-clocks.rst deleted file mode 100644 index 5c22eecab7ba..000000000000 --- a/Documentation/driver-api/media/v4l2-clocks.rst +++ /dev/null @@ -1,31 +0,0 @@ -.. SPDX-License-Identifier: GPL-2.0 - -V4L2 clocks ------------ - -.. attention:: - - This is a temporary API and it shall be replaced by the generic - clock API, when the latter becomes widely available. - -Many subdevices, like camera sensors, TV decoders and encoders, need a clock -signal to be supplied by the system. Often this clock is supplied by the -respective bridge device. The Linux kernel provides a Common Clock Framework for -this purpose. However, it is not (yet) available on all architectures. Besides, -the nature of the multi-functional (clock, data + synchronisation, I2C control) -connection of subdevices to the system might impose special requirements on the -clock API usage. E.g. V4L2 has to support clock provider driver unregistration -while a subdevice driver is holding a reference to the clock. For these reasons -a V4L2 clock helper API has been developed and is provided to bridge and -subdevice drivers. - -The API consists of two parts: two functions to register and unregister a V4L2 -clock source: v4l2_clk_register() and v4l2_clk_unregister() and calls to control -a clock object, similar to the respective generic clock API calls: -v4l2_clk_get(), v4l2_clk_put(), v4l2_clk_enable(), v4l2_clk_disable(), -v4l2_clk_get_rate(), and v4l2_clk_set_rate(). Clock suppliers have to provide -clock operations that will be called when clock users invoke respective API -methods. - -It is expected that once the CCF becomes available on all relevant -architectures this API will be removed. diff --git a/Documentation/driver-api/media/v4l2-core.rst b/Documentation/driver-api/media/v4l2-core.rst index 0dcad7a23141..1a8c4a5f256b 100644 --- a/Documentation/driver-api/media/v4l2-core.rst +++ b/Documentation/driver-api/media/v4l2-core.rst @@ -15,7 +15,6 @@ Video4Linux devices v4l2-controls v4l2-videobuf v4l2-videobuf2 - v4l2-clocks v4l2-dv-timings v4l2-flash-led-class v4l2-mc |