linux-kernel - Re: [PATCH v2 1/3] dt-bindings: iio: adc: stm32: add analog switches supply control

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Date:   Sun, 14 Jul 2019 17:11:41 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     <robh+dt@...nel.org>, <alexandre.torgue@...com>,
        <mark.rutland@....com>, <mcoquelin.stm32@...il.com>,
        <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [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@...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@...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:
>  -----------------------------------