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SubjectRe: [PATCH v2 1/3] dt-bindings: iio: adc: stm32: add analog switches supply control
On Wed, 3 Jul 2019 12:08:14 +0200
Fabrice Gasnier <fabrice.gasnier@st.com> 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@st.com>
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:
> -----------------------------------

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