On some parts, it could be required to use steps before applying
highest frequencies.
This was previously done as part of LL_PLL_ConfigSystemClock_FOO
utility functions which are no more used.
Use device tree to mention when this is required and implement it
in stm32_clock_control_init().
Additionally, fix the calls tp LL_RCC_SetAHBPrescaler, which require
use of ahb_prescaler helper.
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
Now that Kconfig option for STM32 clocks configuration has been
removed, set rcc properties as required.
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
Add initial basic description for Cortex-M33 based
stm32u5 soc series.
This encompass description for base nodes, such as:
- cpu
- flash
- clocks
- sram
Additionally, provide description for variant stm32u575Xi.
Related to clocks nodes, added bindings for stm32u5 specific
rcc node as well as msi and pll clocks.
Header file stm32_clock_control.h was also updated to support
these new bindings.
Note that for compatibility with existing definitions, clock
node describing main pll clock, known as "PLL1", was given two
labels: "pll" and "pll1".
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
Fabio Baltieri