a) for external oscillator: "clk-lse", "clk-hse"
- 3 optional fields are managed
+ 4 optional fields are managed
- "st,bypass" Configure the oscillator bypass mode (HSEBYP, LSEBYP)
+ - "st,digbypass" Configure the bypass mode as full-swing digital signal
+ (DIGBYP)
- "st,css" Activate the clock security system (HSECSSON, LSECSSON)
- "st,drive" (only for LSE) value of the drive for the oscillator
(see LSEDRV_ define in the file dt-bindings/clock/stm32mp1-clksrc.h)