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dt-bindings: iio: adc: stm32: add analog switches supply control

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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@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Fabrice Gasnier 2019-07-03 12:08:14 +02:00 committed by Jonathan Cameron
parent c3a6860706
commit a85a43e045
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
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@ -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:
-----------------------------------