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2019-10-13libcamera: controls: Store control name in ControlIdLaurent Pinchart
The ControlId class stores a pointer to the control name. This works fine for statically-defined controls, but requires code that allocates controls dynamically (for instance based on control discovery on a V4L2 device) to keep a list of control names in separate storage. To ease usage of dynamically allocated controls, store a copy of the control name string in the ControlId class. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-13libcamera: controls: Default ControlList validator argument to nullptrLaurent Pinchart
The ControlList constructor takes a validator pointer that can be null. Set its default value to nullptr to simplify code in users of ControlList. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-13libcamera: controls: Add comparison operators for ControlValueLaurent Pinchart
Add equality and non equality comparison operators for the ControlValue class. This simplifies code that deals with control values. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-13libcamera: control_ids: Generate map of all supported controlsLaurent Pinchart
In order to deserialise a ControlList, we will need to lookup ControlId instances based on their numerical ID. Generate a global map from the controls definitions to support such a lookup. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-13libcamera: control_ids: Fix documentation for controls namespaceLaurent Pinchart
The controls namespace isn't documenting, making it impossible to reference the variables it contains. Furthermore, within the documentation page for the control_ids.h file, links from overview to detailed variable documentation are broken for the same reason. Both issues can be fixed by documenting the controls namespace. Unfortunately doxygen then fails to parse the initialisers for the controls global variables correctly and considers them as functions. To work around this, modify the control_ids.cpp generation script to hide the variables from doxygen, but still expose their documentation. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-13libcamera: pipeline: rkisp1: Avoid copy assignment of V4L2 control mapLaurent Pinchart
Use the std::map::emplace() method to avoid unnecessary creation of an empty V4L2ControlInfoMap folled by a copy assignment. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-11libamera: pipeline: rkisp1: timeline: Fix compilation with gcc-[56]Laurent Pinchart
With gcc 5 and 6, insertion in a std::multimap copies the pair passed as an argument to the insert() method. As the mapped type is a non-copyable std::unique_ptr<>, this fails to compile. Compilation with newer gcc versions succeed due to support for C++-17 and the fix described in https://cplusplus.github.io/LWG/issue2354. To support gcc 5 and 6, fix the issue by using std::multimap::emplace(). Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-11ipa: rkisp1: Avoid unnecessary copyLaurent Pinchart
Use const references in a for loop to avoid an unnecessary copy. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-11libcamera: pipeline: rkisp1: Attach to an IPANiklas Söderlund
Add the plumbing to the pipeline handler to interact with an IPA module. This change makes the usage of an IPA module mandatory for the rkisp1 pipeline. The RkISP1 pipeline handler makes use of a timeline component to schedule actions. This might be useful for other pipeline handlers going forward so keep the generic timeline implementation separate to make it easy to break out. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-11libcamera: ipa: rkisp1: Add basic control of auto exposureNiklas Söderlund
Add an IPA which controls the exposure time and analog gain for a sensor connected to the rkisp1 pipeline. The IPA supports turning AE on and off and informing the camera of the status of the AE control loop. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-11include: linux: Add rkisp1 kernel header and format definitionsNiklas Söderlund
Add kernel header and format definitions from v8 of the rkisp1 series [1]. The driver is currently out of tree, the header file is not exported as part of the standard kernel uAPI. Headers have been exported on top of a v5.2 kernel tree using scripts/headers_install.sh. 1. https://lore.kernel.org/linux-media/20190730184256.30338-1-helen.koike@collabora.com/ Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-11libcamera: ipa: Extend to support IPA interactionsNiklas Söderlund
The IPA interface needs to support interactions with the pipeline; add interfaces to control the sensor and handling of request ISP parameters and statistics. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-10libcamera: request: Add metadata informationNiklas Söderlund
A new ControlList container is needed to hold metadata coming out of the IPA. The list of supported controls in this list is expected to grow, so for now do not add a validator for the list. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-10libcamera: controls: Add AeLocked controlNiklas Söderlund
Add a control to report lock status of the Auto Exposure algorithm. The idea is that if an AE algorithm is running the control shall be added to the metadata control list. If the AE algorithm is locked the value shall be set to true, if it's converging it shall be set to false. If the AE algorithm is not running the control shall not be present in the metadata control list. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-10libcamera: controls: Add AeEnable controlNiklas Söderlund
Add a control to enable/disable Auto Exposure. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-10libcamera: controls: Fix documentation of AwbEnableNiklas Söderlund
Align the wording of the documentation for the AwbEnable control with review comments for similar controls. Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-10libcamera: pipeline: Move IPA from pipeline to camera dataNiklas Söderlund
The IPA acts on a camera and not on a pipeline which can expose more then one camera. Move the IPA reference to the CameraData. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-08test: ipa: Add test for the IPA InterfaceJacopo Mondi
Implement a basic test for IPA Interface using the VIMC dummy IPA module. The test implements an out-of-band feedback channel between the test and the dummy IPA module to verify the success of the IPA interactions. Test the only available operation defined by the IPA interface by receiving a confirmation code on the fifo communication channel. Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-08ipa: vimc: Add support for tracing operationsJacopo Mondi
Add support to the dummy VIMC IPA for tracing operation by using a FIFO channel that will be used by the IPA Interface test to verify communications with the IPA. At the moment only add support for the init() operation as it's the only defined one. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-08ipa: meson: Give IPAs access to internal libcamera APIsJacopo Mondi
Open source IPA implementations can benefit from usage of libcamera internal APIs. Allow this by compiling against the internal headers and linking against libcamera. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-08test: ipa: Rename the ipa_test to ipa_module_testJacopo Mondi
Update the IPA test to match the test class name in prevision of adding more IPA tests. Also update the description comment in the test unit, as the old name for the test was still used. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-08ipa: vimc: Rename ipa_dummy to ipa_vimcJacopo Mondi
The DummyIPA is actually a test IPA module for the virtual media controller driver VIMC. Rename it accordingly to its usage. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-07test: timer: Test start() with absolute deadlineLaurent Pinchart
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-07libcamera: timer: Add start() method with absolute deadlineLaurent Pinchart
The Timer class is started using a timer duration. To help callers that require waiting for an absolute deadline, add a start() overload that takes a std::chrono::steady_clock::time_point value. This will be used by IPAs. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-07test: timer-thread: Test starting a timer from another threadLaurent Pinchart
Timers can't be started from another thread. Ensure that attempting to do so fails. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-07libcamera: timer: Forbid starting or stopping timer from another threadLaurent Pinchart
Starting or stopping a timer from a different thread than the one it belongs to is inherently racy. Disallow it. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-07libcamera: timer: Allow restarting a timer before expirationLaurent Pinchart
The Timer API allows restarting a timer before expiration. This isn't correctly implemented, fix it. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-07test: timer: Test that a timer can be restarted before it expiresLaurent Pinchart
The Timer API allows restarting a timer before it expires. Add a corresponding test. The test fails as the Timer class doesn't comply with its API documentation. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-07test: timer: Test that deadline() isn't reset upon time outLaurent Pinchart
Verify that the timer deadline stays valid after the timer expires. As the test now uses the deadline in order to compute the jitter, the interval_ field isn't used anymore and can be removed. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-07libcamera: timer: Don't reset deadline after time outLaurent Pinchart
Users of the Timer class may benefit from retrieving the timer deadline after it times out. This is currently not possible as the deadline is reset to 0 when the timer times out or is stopped. Fix this by not resetting the deadline, and adding a new running_ field to the Timer class to implement isRunning(). Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-07libcamera: timer: Remove the interval() methodLaurent Pinchart
The libcamera timers are single-shot timers. They are started with a duration, but fire once only, not based on an interval. Remove the interval concept by removing the interval() method, and rename other occurences of interval to duration. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-05libcamera: controls: Use ControlValidator to validate ControlListLaurent Pinchart
Replace the manual validation of controls against a Camera with usage of the new ControlValidator interface. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-05libcamera: Add ControlValidator implementation for CameraLaurent Pinchart
Add a new CameraControlValidator class that implements the ControlValidator interface for a Camera object. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-05libcamera: Add ControlValidatorLaurent Pinchart
The new abstract ControlValidator class defines an interface that will be used by the ControlList class to validate controls. This will allow controls to the validated against different object types, such as Camera and V4L2Device. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-05libcamera: v4l2_controls: Use the ControlRange class for control infoLaurent Pinchart
Use the ControlRange class to express the range of a V4L2 control, replacing the open-coded minimum and maximum fields in the V4L2ControlInfo class. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-05libcamera: v4l2_controls: Use the ControlValue class for data storageLaurent Pinchart
Use the ControlValue class to replace the manually crafted data storage in V4L2Control. This will help sharing code when more data types will be supported. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-05libcamera: controls: Rename ControlInfo to ControlRangeLaurent Pinchart
The ControlInfo class stores a range of valid values for a control. Its name is vague, as "info" has multiple meanings. Rename it to ControlRange. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-05libcamera: controls: Remove ControlInfo::idLaurent Pinchart
The ControlInfo id member is only used in the toString() method of the class, and nowhere else externally. The same way that ControlValue doesn't store a ControlId, ControlInfo shouldn't. Remove it. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-05libcamera: controls: Remove the unused ControlList::update() methodLaurent Pinchart
The ControlList::update() method is unused. While it is meant to fulfil a need of applications, having no user means that it is most probably not correctly designed. Remove the method, we will add it back later if needed. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-05libcamera: controls: Auto-generate control_ids.h and control_ids.cppLaurent Pinchart
Bring back auto-generation of control ids. In this version, both the header and the source files are generated from a single YAML file that stores all control definitions. This allows centralising controls in a single file, while the previous version required keeping both declarations (in a header) and documentation (in a the source) in sync manually. Using YAML as a format to store control definitions is a trade-off between ease of use (there are many YAML parsers available) and simplicity (XML was considered, but would have lead to more complex processing). A new build time dependency is added on python3-yaml, which should be available as a package in all distributions and build environments. The YAML format is likely to change over time as we improve documentation of controls, the first version simply copies the information currently available. Future improvements should also include a YAML schema to validate the YAML source file. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-04libcamera: controls: Improve the API towards applicationsLaurent Pinchart
Rework the control-related classes to improve the API towards applications. The goal is to enable writing code similar to Request *req = ...; ControlList &controls = req->controls(); controls->set(controls::AwbEnable, false); controls->set(controls::ManualExposure, 1000); ... int32_t exposure = controls->get(controls::ManualExposure); with the get and set operations ensuring type safety for the control values. This is achieved by creating the following classes: - Control defines controls and is the main way to reference a control. It is a template class to allow methods using it to refer to the control type. - ControlId is the base class of Control. It stores the control ID, name and type, and can be used in contexts where a control needs to be referenced regardless of its type (for instance in lists of controls). This class replaces ControlIdentifier. - ControlValue is kept as-is. The ControlList class now exposes two template get() and set() methods that replace the operator[]. They ensure type safety by infering the value type from the Control reference that they receive. The main way to refer to a control is now through the Control class, and optionally through its base ControlId class. The ControlId enumeration is removed, replaced by a list of global Control instances. Numerical control IDs are turned into macros, and are still exposed as they are required to communicate with IPAs (especially to deserialise control lists). They should however not be used by applications. Auto-generation of header and source files is removed for now to keep the change simple. It will be added back in the future in a more elaborate form. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-04libcamera: controls: Use explicit 32-bit integer typesLaurent Pinchart
Make the control API more explicit when dealing with integer controls by specifying the size. We already do so for 64-bit integers, using int64_t and ControlTypeInteger64, do the same for 32-bit integers. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-04libcamera: controls: Make ControlValue get/set accessors template methodsLaurent Pinchart
The ControlValue get accessors are implemented with functions of different names, whlie the set accessors use polymorphism to support different control types. This isn't very consistent and intuitive. Make the API clearer by using template methods. This will also have the added advantage that support for the new types will only require adding template specialisations, without adding new methods. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-04libcamera: controls: Rename ControlValueType to ControlTypeLaurent Pinchart
The type of a control value is also the type of the control. Shorten the ControlValueType enumeration to ControlType, and rename ControlValue* to ControlType* for better clarity. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-10-04ipa: ipa_manager: Print the loaded IPA modules pathJacopo Mondi
Add debug message to report which IPA modules have been loaded and in which order. The loading order is particularly relevant for the test VIMC IPA, as the same IPA is compiled with an open source license tag and a proprietary one and they both match() against the VIMC pipeline handler. Being informed about their loading order is helpful to understand which one of the two is actually in use. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-04libcamera: ipa_manager: Sort IPA modules by nameLaurent Pinchart
Sort IPA modules by name when enumerating modules in a directory in order to guarantee a stable ordering. This eases debugging by making issues more reproducible. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-04libcamera: camera_manager: Fix typo in the documentationLaurent Pinchart
Fix a typo in the CameraManager documentation. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-10-01qcam: Fix timers not emitting timeout signalNiklas Söderlund
The timer signal was never emitted in QtEventDispatcher::timerEvent(), this results in timers not working as designed running under the Qt event loop. Fix this by emitting the signal on timeout. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-10-01qcam: Stop timer on timeoutNiklas Söderlund
Stopping the timer will reset the Timer::deadline_ field to 0 fixing potential bugs and call QtEventDispatcher::unregisterTimer() which will take care of the cleanup. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-09-27qcam: Fix unregister of not registered timerNiklas Söderlund
If an unregistered timer is given to QtEventDispatcher::unregisterTimer() an error is printed and Qt gets confused and locks up. Fix this by following the libcamera documentation that passing a unregistered timer is a no-op. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>