linux-kernel - [PATCH v4 7/8] ARM: dts: stm32: add dummy vdd

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Date:   Wed, 12 Oct 2022 16:22:04 +0200
From:   Olivier Moysan <olivier.moysan@...s.st.com>
To:     Rob Herring <robh+dt@...nel.org>,
        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>,
        Olivier Moysan <olivier.moysan@...s.st.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <devicetree@...r.kernel.org>
Subject: [PATCH v4 7/8] ARM: dts: stm32: add dummy vdd_adc regulator on stm32mp135f-dk

Add a dummy fixed regulator vdd-adc for STM32 ADC,
on STM32MP135F-DK board, while SCMI regulators are not available.
This patch will have to be removed when SCMI regulator support
is added to STM32MP13.

This patch intends to allow ADC enabling on STM32MP13.
With this patch the ADC can probe but it cannot return
valid conversion data, as it's regulator is not actually enabled.

Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
---
 arch/arm/boot/dts/stm32mp135f-dk.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp135f-dk.dts b/arch/arm/boot/dts/stm32mp135f-dk.dts
index de341d17e87d..348adeec7fdc 100644
--- a/arch/arm/boot/dts/stm32mp135f-dk.dts
+++ b/arch/arm/boot/dts/stm32mp135f-dk.dts
@@ -66,6 +66,14 @@ vdd_sd: vdd-sd {
 		regulator-max-microvolt = <2900000>;
 		regulator-always-on;
 	};
+
+	vdd_adc: vdd-adc {
+		compatible = "regulator-fixed";
+		regulator-name = "vdd_adc";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
 };
 
 &i2c1 {
-- 
2.25.1