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

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Message-ID: <20190616161245.38168d94@archlinux>
Date:   Sun, 16 Jun 2019 16:12:45 +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 1/3] dt-bindings: iio: adc: stm32: add analog switches
 supply control

On Wed, 12 Jun 2019 09:24:34 +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).
> 
> 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.gasnier@...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.

input switches

> +- 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:
>  -----------------------------------