linux-kernel - [PATCH v2] arm64: dts: imx8mn-var-som-symphony: add vcc supply for PCA9534

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Message-Id: <20231107155040.1644169-1-hugo@hugovil.com>
Date:   Tue,  7 Nov 2023 10:50:40 -0500
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 v2] arm64: dts: imx8mn-var-som-symphony: add vcc supply for PCA9534

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

The following warning is shown when probing device:

    pca953x 1-0020: supply vcc not found, using dummy regulator

Define a new fixed 3.3v regulator for carrier board peripherals,
enabled by mosfet switch Q2 after the SOM_3V3 supply rises (no software
control).

Add this new regulator as vcc supply to the PCA9534 to silence the warning.

Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
---
Changes for V2:
- add peripherals regulator and update commit message for Q2 mosfet.

 .../boot/dts/freescale/imx8mn-var-som-symphony.dts     | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
index a7a57442cb81..a6b94d1957c9 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
@@ -57,6 +57,15 @@ led {
 			linux,default-trigger = "heartbeat";
 		};
 	};
+
+	/* Peripherals supply, enabled by Q2 after SOM_3V3 rises. */
+	reg_per_3v3: regulator-peripheral-3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "per_3v3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
 };
 
 &ethphy {
@@ -79,6 +88,7 @@ pca9534: gpio@20 {
 		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
 		#gpio-cells = <2>;
 		wakeup-source;
+		vcc-supply = <&reg_per_3v3>;
 
 		/* USB 3.0 OTG (usbotg1) / SATA port switch, set to USB 3.0 */
 		usb3-sata-sel-hog {

base-commit: be3ca57cfb777ad820c6659d52e60bbdd36bf5ff
-- 
2.39.2