[2/2] ARM: dts: stm32: add ADC support to stm32mp157c-ed1
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Message ID 1573231059-395-3-git-send-email-fabrice.gasnier@st.com
State Accepted
Commit 91ad4af4b29709462a2185c770ac1de9bd2e2c09
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Series
  • Add support for ADC on stm32mp157c-ed1
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Commit Message

Fabrice Gasnier Nov. 8, 2019, 4:37 p.m. UTC
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(+)

Patch
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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>;