linux-kernel - [PATCH] arm64: dts: imx8mn-var-som: add fixed 3.3V regulator for EEPROM

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Message-Id: <20231030151920.191018-1-hugo@hugovil.com>
Date:   Mon, 30 Oct 2023 11:19:20 -0400
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     hugo@...ovil.com, Hugo Villeneuve <hvilleneuve@...onoff.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: imx8mn-var-som: add fixed 3.3V regulator for EEPROM

From: Hugo Villeneuve <hvilleneuve@...onoff.com>

When the EEPROM is probed, we have this warning:

    at24 0-0052: supply vcc not found, using dummy regulator

Add fixed 3.3v regulator to silence the warning.

Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
---
 arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
index b8946edf317b..b364307868f2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
@@ -31,6 +31,14 @@ reg_eth_phy: regulator-eth-phy {
 		gpio = <&gpio2 9 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
 	};
+
+	reg_3v3_fixed: regulator-3v3-fixed {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed_3v3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
 };
 
 &A53_0 {
@@ -234,6 +242,7 @@ eeprom_som: eeprom@52 {
 		compatible = "atmel,24c04";
 		reg = <0x52>;
 		pagesize = <16>;
+		vcc-supply = <&reg_3v3_fixed>;
 	};
 };
 

base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa
-- 
2.39.2