On Wed, 3 Jul 2019 12:08:14 +0200 Fabrice Gasnier <fabrice.gasnier@xxxxxx> wrote: > 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). Booster or vdd can be used, to get full ADC > performances. > > Add documentation for: > - optional booster-supply that can be used on stm32h7 and stm32mp1. > - optional vdd-supply that can be used on stm32mp1 to supply analog > circuitry, selected by syscfg. > Mark these as optional, since this is a trade-off between analog > performance and power consumption. > > Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx> Seems fine to me. Applied to the togreg branch of iio.git and pushed out as testing for the autobuilders to play with it. Thanks, Jonathan > --- > Changes in v2: > - Rework since: "Add missing vdda-supply to STM32 ADC" series. > - Add booster-supply regulator description > - typo: input switches > --- > 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 93a0bd2..4c0da8c 100644 > --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt > +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt > @@ -47,6 +47,12 @@ 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. > +- booster-supply: Phandle to the embedded booster regulator that can be used > + to supply ADC analog input switches on stm32h7 and stm32mp1. > +- vdd-supply: Phandle to the vdd input voltage. It can be used to supply ADC > + analog input switches on stm32mp1. > +- st,syscfg: Phandle to system configuration controller. It can be used to > + control the analog circuitry on stm32mp1. > > Contents of a stm32 adc child node: > -----------------------------------
