On stm32h7 and stm32mp1, the ADC inputs are multiplexed with analog switches which have reduced performances when their supply is below 2.7V (vdda by default).
Add documentation for optional vdda-supply & vdd-supply that can be used to supply analog circuitry (controlled by syscfg bits). Signed-off-by: Fabrice Gasnier <fabrice.gasn...@st.com> --- Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt index 8346bcb..3af48b9 100644 --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt @@ -46,6 +46,12 @@ Required properties: Optional properties: - A pinctrl state named "default" for each ADC channel may be defined to set inX ADC pins in mode of operation for analog input on external pin. +- vdda-supply: Phandle to the vdda input voltage. It can be used to supply ADC + analog inputs switches on stm32h7 and stm32mp1. +- vdd-supply: Phandle to the vdd input voltage. It can be used to supply ADC + analog inputs switches on stm32mp1. +- st,syscfg: Phandle to system configuration controller. It can be used to + control the analog circuitry on stm32h7 and stm32mp1. Contents of a stm32 adc child node: ----------------------------------- -- 2.7.4
