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From:   Olivier Moysan <olivier.moysan@foss.st.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Fabrice Gasnier <fabrice.gasnier@foss.st.com>,
        Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Olivier Moysan <olivier.moysan@foss.st.com>
CC:     <linux-arm-kernel@lists.infradead.org>,
        <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <devicetree@vger.kernel.org>
Subject: [PATCH v4 8/8] ARM: dts: stm32: add adc support on stm32mp135f-dk
Date:   Wed, 12 Oct 2022 16:22:05 +0200
Message-ID: <20221012142205.13041-9-olivier.moysan@foss.st.com>
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References: <20221012142205.13041-1-olivier.moysan@foss.st.com>
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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@foss.st.com>
---
 arch/arm/boot/dts/stm32mp135f-dk.dts | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp135f-dk.dts b/arch/arm/boot/dts/stm32mp135f-dk.dts
index 348adeec7fdc..967df1944822 100644
--- a/arch/arm/boot/dts/stm32mp135f-dk.dts
+++ b/arch/arm/boot/dts/stm32mp135f-dk.dts
@@ -76,6 +76,31 @@ 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>;
+		};
+	};
+};
+
 &i2c1 {
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&i2c1_pins_a>;
-- 
2.25.1