From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Cameron Subject: Re: [PATCH 1/3] dt-bindings: iio: adc: stm32: add analog switches supply control Date: Sun, 16 Jun 2019 16:12:45 +0100 Message-ID: <20190616161245.38168d94@archlinux> References: <1560324276-681-1-git-send-email-fabrice.gasnier@st.com> <1560324276-681-2-git-send-email-fabrice.gasnier@st.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1560324276-681-2-git-send-email-fabrice.gasnier@st.com> Sender: linux-kernel-owner@vger.kernel.org To: Fabrice Gasnier Cc: robh+dt@kernel.org, alexandre.torgue@st.com, mark.rutland@arm.com, mcoquelin.stm32@gmail.com, lars@metafoo.de, knaack.h@gmx.de, pmeerw@pmeerw.net, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org On Wed, 12 Jun 2019 09:24:34 +0200 Fabrice Gasnier 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 > --- > 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: > -----------------------------------