power: regulator: Add support for stm32-vrefbuf
Add regulator driver for STM32 voltage reference buffer which can be used as voltage reference for ADCs, DACs and external components through dedicated VREF+ pin. Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: NPatrice Chotard <patrice.chotard@st.com>
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