drivers: stm32_rtc: prevent registering of RTC interrupt when it's not used by OP-TEE

Do not register the RTC interrupt when it's not used by OP-TEE as it
prevents non-secure world from handling tha

drivers: stm32_rtc: prevent registering of RTC interrupt when it's not used by OP-TEE

Do not register the RTC interrupt when it's not used by OP-TEE as it
prevents non-secure world from handling that interrupt.

The RTC interrupt line is only used if the RTC is set as a wakeup source
or RTC is secured by the RIF (only for STM32MP2x) and RTC PTA and
async notif are enabled.

Signed-off-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Reviewed-by: Clément Le Goffic <legoffic.clement@gmail.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: stm32_rtc: add the capability to wakeup the platform

During probe, we look for the property "wakeup-source" that
will trigger the feature "RTC_WAKEUP_ALARM" which will
be send to the caller

drivers: stm32_rtc: add the capability to wakeup the platform

During probe, we look for the property "wakeup-source" that
will trigger the feature "RTC_WAKEUP_ALARM" which will
be send to the callers of the framework `rtc_get_info()` PTA.

We also register the `stm32_rtc_alarm_wake_set_status()` callback.
This callback should be called when the callers knows that the platform
will go in sleep mode.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_rtc: add alarm related operations

The RTC framework allows the registration of function :
- `read_alarm()`
- `set_alarm()`
- `alarm_enable()`
- `wait_alarm()`
- `cancel_wait()`

Signe

drivers: stm32_rtc: add alarm related operations

The RTC framework allows the registration of function :
- `read_alarm()`
- `set_alarm()`
- `alarm_enable()`
- `wait_alarm()`
- `cancel_wait()`

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_rtc: add init configuration function

The init function aims to contains init configurations of the RTC
peripheral such as prescalers, config or calibration registers.
Add "CFG_STM32_H

drivers: stm32_rtc: add init configuration function

The init function aims to contains init configurations of the RTC
peripheral such as prescalers, config or calibration registers.
Add "CFG_STM32_HIGH_ACCURACY" (default to no) config to enable the
high accuracy mode which allow the highest refresh rate of the subsecond
register.
Also merge the functions `stm32_rtc_wait_sync()` with
`stm32_exit_init_mode()` as every stm32 exit init mode was followed
by a wait sync.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: stm32_rtc: add time stamping feature support

Support the time stamping features of the RTC. It is useful to generate
a timestamp whenever a particular event occurs.

Signed-off-by: Gatien C

drivers: stm32_rtc: add time stamping feature support

Support the time stamping features of the RTC. It is useful to generate
a timestamp whenever a particular event occurs.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: stm32_rtc: introduce STM32 RTC driver

Driver interface allows to read date&time from RTC device, generate
RTC timestamps and compute time delta between RTC date & time values.

The RTC is a

drivers: stm32_rtc: introduce STM32 RTC driver

Driver interface allows to read date&time from RTC device, generate
RTC timestamps and compute time delta between RTC date & time values.

The RTC is a firewall-aware peripheral. It means that the RTC driver is
in charge of configuring its own firewall restrictions and that the RTC
has dedicated firewall configuration registers.

The RTC provide APIs with time structure compatible with linux kernel
driver.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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