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[3/3] ARM: dts: stm32: enable ADC support on stm32mp157a-dk1

Message ID 1568385280-2633-4-git-send-email-fabrice.gasnier@st.com (mailing list archive)
State Mainlined
Commit f9f5467f05eade2eb84bc6eb68f855198797f9b4
Headers show
Series Add support for ADC on stm32mp157a-dk1 | expand

Commit Message

Fabrice Gasnier Sept. 13, 2019, 2:34 p.m. UTC
Configure ADC support on stm32mp157a-dk1. It can be used for various
purpose:
- AIN connector has several analog inputs: ANA0, ANA1, ADC2 in6 & in2,
  ADC1 in13 & in6
- USB Type-C CC1 & CC2 pins wired to in18 & in19
It's easier then to Configure them all. But keep them disabled by default,
so the pins are kept in their initial state to lower power consumption.
This way they can also be used as GPIO.
Add VDD and VDDA supplies to ADC on stm32mp157c-dk1 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/stm32mp157a-dk1.dts | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/stm32mp157a-dk1.dts b/arch/arm/boot/dts/stm32mp157a-dk1.dts
index ebd9f33..2f42fcd 100644
--- a/arch/arm/boot/dts/stm32mp157a-dk1.dts
+++ b/arch/arm/boot/dts/stm32mp157a-dk1.dts
@@ -97,6 +97,33 @@ 
 	};
 };
 
+&adc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&adc12_ain_pins_a>, <&adc12_usb_cc_pins_a>;
+	vdd-supply = <&vdd>;
+	vdda-supply = <&vdd>;
+	vref-supply = <&vrefbuf>;
+	status = "disabled";
+	adc1: adc@0 {
+		/*
+		 * Type-C USB_PWR_CC1 & USB_PWR_CC2 on in18 & in19.
+		 * Use at least 5 * RC time, e.g. 5 * (Rp + Rd) * C:
+		 * 5 * (56 + 47kOhms) * 5pF => 2.5us.
+		 * Use arbitrary margin here (e.g. 5us).
+		 */
+		st,min-sample-time-nsecs = <5000>;
+		/* AIN connector, USB Type-C CC1 & CC2 */
+		st,adc-channels = <0 1 6 13 18 19>;
+		status = "okay";
+	};
+	adc2: adc@100 {
+		/* AIN connector, USB Type-C CC1 & CC2 */
+		st,adc-channels = <0 1 2 6 18 19>;
+		st,min-sample-time-nsecs = <5000>;
+		status = "okay";
+	};
+};
+
 &cec {
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&cec_pins_b>;