Clock Control¶
Overview¶
The clock control API provides access to clocks in the system, including the ability to turn them on and off.
API Reference¶
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group
clock_control_interface Clock Control Interface.
Defines
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CLOCK_CONTROL_SUBSYS_ALL¶
Typedefs
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typedef void *
clock_control_subsys_t¶ clock_control_subsys_t is a type to identify a clock controller sub-system. Such data pointed is opaque and relevant only to the clock controller driver instance being used.
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typedef void (*
clock_control_cb_t)(const struct device *dev, clock_control_subsys_t subsys, void *user_data)¶ Callback called on clock started.
- Parameters
dev – Device structure whose driver controls the clock.
subsys – Opaque data representing the clock.
user_data – User data.
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typedef int (*
clock_control)(const struct device *dev, clock_control_subsys_t sys)¶
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typedef int (*
clock_control_get)(const struct device *dev, clock_control_subsys_t sys, uint32_t *rate)¶
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typedef int (*
clock_control_async_on_fn)(const struct device *dev, clock_control_subsys_t sys, clock_control_cb_t cb, void *user_data)¶
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typedef enum clock_control_status (*
clock_control_get_status_fn)(const struct device *dev, clock_control_subsys_t sys)¶
Enums
Functions
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static inline int
clock_control_on(const struct device *dev, clock_control_subsys_t sys)¶ Enable a clock controlled by the device.
On success, the clock is enabled and ready when this function returns. This function may sleep, and thus can only be called from thread context.
Use clock_control_async_on() for non-blocking operation.
- Parameters
dev – Device structure whose driver controls the clock.
sys – Opaque data representing the clock.
- Returns
0 on success, negative errno on failure.
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static inline int
clock_control_off(const struct device *dev, clock_control_subsys_t sys)¶ Disable a clock controlled by the device.
This function is non-blocking and can be called from any context. On success, the clock is disabled when this function returns.
- Parameters
dev – Device structure whose driver controls the clock
sys – Opaque data representing the clock
- Returns
0 on success, negative errno on failure.
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static inline int
clock_control_async_on(const struct device *dev, clock_control_subsys_t sys, clock_control_cb_t cb, void *user_data)¶ Request clock to start with notification when clock has been started.
Function is non-blocking and can be called from any context. User callback is called when clock is started.
- Parameters
dev – Device.
sys – A pointer to an opaque data representing the sub-system.
cb – Callback.
user_data – User context passed to the callback.
- Returns 0
if start is successfully initiated.
- Returns -EALREADY
if clock was already started and is starting or running.
- Returns -ENOTSUP
If the requested mode of operation is not supported.
- Returns -ENOSYS
if the interface is not implemented.
- Returns other
negative errno on vendor specific error.
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static inline enum clock_control_status
clock_control_get_status(const struct device *dev, clock_control_subsys_t sys)¶ Get clock status.
- Parameters
dev – Device.
sys – A pointer to an opaque data representing the sub-system.
- Returns
Status.
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static inline int
clock_control_get_rate(const struct device *dev, clock_control_subsys_t sys, uint32_t *rate)¶ Obtain the clock rate of given sub-system.
- Parameters
dev – Pointer to the device structure for the clock controller driver instance
sys – A pointer to an opaque data representing the sub-system
rate – [out] Subsystem clock rate
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struct
clock_control_driver_api¶ - #include <clock_control.h>
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