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Allow selecting a voltage scale using Device Tree on STM32U5 series. This is notably useful when a high system clock frequency is not required, but the application still wants to use the USB IPs which are only available in certain ranges.

Fixes #98641.

Add a binding for the power controller of STM32U5 series.

Signed-off-by: Mathieu Choplain <[email protected]>
Add the "st,stm32u5-pwr" compatible to the Power Controller node in the
DTSI for STM32U5 series.

Signed-off-by: Mathieu Choplain <[email protected]>
Add support for the new `voltage-scale` property on the STM32U5-specific
Power Controller binding.

Signed-off-by: Mathieu Choplain <[email protected]>
Add new voltage scale selection property for STM32U5 to 4.4 release notes.

Signed-off-by: Mathieu Choplain <[email protected]>
@mathieuchopstm mathieuchopstm added the platform: STM32 ST Micro STM32 label Dec 1, 2025
@mathieuchopstm
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@petrosyan-van could you please give some feedback on this? 🙂

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sonarqubecloud bot commented Dec 1, 2025

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clock_stm32_u5: Voltage regulator high ranges cannot be selected when running at low clock frequency

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