[riot-notifications] [RIOT-OS/RIOT] cpu/stm32f2f4f7: expose clock configuration in kconfig (#15632)

Alexandre Abadie notifications at github.com
Tue Jan 5 19:14:32 CET 2021


I just looked at it and I don't understand the problem. All values seems correctly computed in autoconf.h: 
```
#define CONFIG_CUSTOM_PLL_PARAMS 1
#define CONFIG_CLOCK_PLL_M 25
#define CONFIG_CLOCK_PLL_N 192
#define CONFIG_PLL_P_DIV_2 1
#define CONFIG_CLOCK_PLL_P 2
#define CONFIG_CLOCK_PLL_Q 4
```

More importantly, if PLLQ was completely wrong, the USB wouldn't work at all since it's used as the 48MHz clock source.

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