From: Fabrice Gasnier <fabrice.gasnier@st.com>
Date: Tue, 11 Jul 2017 16:13:00 +0000 (+0200)
Subject: ARM: dts: stm32: enable ADC on stm32h743i-eval board
X-Git-Tag: rel_imx_4.19.35_1.1.0~11730^2~33^2~2
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=090992a9ca543e3d84f9f0cdb118b7d04fce7152;p=linux.git

ARM: dts: stm32: enable ADC on stm32h743i-eval board

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@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
---

diff --git a/arch/arm/boot/dts/stm32h743i-eval.dts b/arch/arm/boot/dts/stm32h743i-eval.dts
index c6effbb36e4a..6c07786e7ddb 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 {