There's a potentiometer connected to ADC1 and ADC2 in0 on
stm32h743i-eval board.
- Add fixed-voltage 'vdda' regulator that supplies 'vref' pin.
It's used as voltage reference for ADC and/or DAC.
- Enable ADC1 in0 input (arbitrary choice: could be ADC2 as well).
Note: No pinctrl is needed to use in0 dedicated analog input pin
(e.g. ADC12_INP0).
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
---
arch/arm/boot/dts/stm32h743i-eval.dts | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/arch/arm/boot/dts/stm32h743i-eval.dts b/arch/arm/boot/dts/stm32h743i-eval.dts
index c6effbb..6c07786 100644
--- a/arch/arm/boot/dts/stm32h743i-eval.dts
+++ b/arch/arm/boot/dts/stm32h743i-eval.dts
@@ -60,6 +60,24 @@
aliases {
serial0 = &usart1;
};
+
+ vdda: regulator-vdda {
+ compatible = "regulator-fixed";
+ regulator-name = "vdda";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-always-on;
+ };
+};
+
+&adc_12 {
+ vref-supply = <&vdda>;
+ status = "okay";
+ adc1: adc@0 {
+ /* potentiometer */
+ st,adc-channels = <0>;
+ status = "okay";
+ };
};
&clk_hse {
--
1.9.1
--
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