From: Fabrice Gasnier <fabrice.gasnier@st.com>
To: <alexandre.torgue@st.com>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, robh+dt@kernel.org,
mcoquelin.stm32@gmail.com, fabrice.gasnier@st.com,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] ARM: dts: stm32: add ADC support to stm32mp157c-ed1
Date: Fri, 8 Nov 2019 17:37:39 +0100 [thread overview]
Message-ID: <1573231059-395-3-git-send-email-fabrice.gasnier@st.com> (raw)
In-Reply-To: <1573231059-395-1-git-send-email-fabrice.gasnier@st.com>
Add ADC support to stm32mp157c-ed1 board.
Following ADC signals are dedicated for analog and routed to connectors:
- ADC1/2 in0 (ANA0)
- ADC1/2 in1 (ANA1)
- ADC1 in6 (PF12)
Configure ADC1 with these signals. But keep it disabled by default, so
PF12 can be used as gpio by default.
Add VDD and VDDA supplies to ADC on stm32mp157c-ed1 board. This allows to
get full ADC analog performances in case VDDA is below 2.7V (not the case
by default).
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
arch/arm/boot/dts/stm32mp157c-ed1.dts | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/arm/boot/dts/stm32mp157c-ed1.dts b/arch/arm/boot/dts/stm32mp157c-ed1.dts
index b8cc0fb..d889813 100644
--- a/arch/arm/boot/dts/stm32mp157c-ed1.dts
+++ b/arch/arm/boot/dts/stm32mp157c-ed1.dts
@@ -89,6 +89,22 @@
};
};
+&adc {
+ /* ANA0, ANA1 are dedicated pins and don't need pinctrl: only in6. */
+ pinctrl-0 = <&adc1_in6_pins_a>;
+ pinctrl-names = "default";
+ vdd-supply = <&vdd>;
+ vdda-supply = <&vdda>;
+ vref-supply = <&vdda>;
+ status = "disabled";
+ adc1: adc@0 {
+ st,adc-channels = <0 1 6>;
+ /* 16.5 ck_cycles sampling time */
+ st,min-sample-time-nsecs = <400>;
+ status = "okay";
+ };
+};
+
&dac {
pinctrl-names = "default";
pinctrl-0 = <&dac_ch1_pins_a &dac_ch2_pins_a>;
--
2.7.4
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next prev parent reply other threads:[~2019-11-08 16:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-08 16:37 [PATCH 0/2] Add support for ADC on stm32mp157c-ed1 Fabrice Gasnier
2019-11-08 16:37 ` [PATCH 1/2] ARM: dts: stm32: add ADC pins used for stm32mp157c-ed1 Fabrice Gasnier
2019-11-08 16:37 ` Fabrice Gasnier [this message]
2019-11-15 13:10 ` [PATCH 0/2] Add support for ADC on stm32mp157c-ed1 Alexandre Torgue
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