linux-kernel - [PATCH 8/8] ARM: dts: stm32: add adc support on stm32mp135f-dk

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Message-ID: <20220928164114.48339-9-olivier.moysan@foss.st.com>
Date:   Wed, 28 Sep 2022 18:41:14 +0200
From:   Olivier Moysan <olivier.moysan@...s.st.com>
To:     Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        <nuno.sa@...log.com>, Olivier Moysan <olivier.moysan@...s.st.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Wan Jiabing <wanjiabing@...o.com>,
        Yannick Brosseau <yannick.brosseau@...il.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: [PATCH 8/8] ARM: dts: stm32: add adc support on stm32mp135f-dk

Configure ADC support on stm32mp135f-dk. ADC can be used for
USB Type-C CC1 & CC2 pins wired to in6 & in12.

Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
---
 arch/arm/boot/dts/stm32mp135f-dk.dts | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp135f-dk.dts b/arch/arm/boot/dts/stm32mp135f-dk.dts
index 95068231ed57..5b7630a2452e 100644
--- a/arch/arm/boot/dts/stm32mp135f-dk.dts
+++ b/arch/arm/boot/dts/stm32mp135f-dk.dts
@@ -76,6 +76,32 @@ vdd_adc: vdd-adc {
 	};
 };
 
+&adc_1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&adc1_usb_cc_pins_a>;
+	vdda-supply = <&vdd_adc>;
+	vref-supply = <&vdd_adc>;
+	status = "okay";
+
+	adc1: adc@0 {
+		status = "okay";
+		/*
+		 * Type-C USB_PWR_CC1 & USB_PWR_CC2 on in6 & in12.
+		 * Use at least 5 * RC time, e.g. 5 * (Rp + Rd) * C:
+		 * 5 * (5.1 + 47kOhms) * 5pF => 1.3us.
+		 * Use arbitrary margin here (e.g. 5us).
+		 */
+		channel@6 {
+			reg = <6>;
+			st,min-sample-time-ns = <5000>;
+		};
+		channel@12 {
+			reg = <12>;
+			st,min-sample-time-ns = <5000>;
+		};
+	};
+};
+
 &iwdg2 {
 	timeout-sec = <32>;
 	status = "okay";
-- 
2.25.1