linux-kernel - [PATCH 2/2] arm64: dts: freescale: imx93-phyboard-nash: Current sense via iio-hwmon

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Message-Id: <20250903113700.3079626-2-primoz.fiser@norik.com>
Date: Wed,  3 Sep 2025 13:37:00 +0200
From: Primoz Fiser <primoz.fiser@...ik.com>
To: Peter Rosin <peda@...ntia.se>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sa <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.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>
Cc: linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	upstream@...ts.phytec.de
Subject: [PATCH 2/2] arm64: dts: freescale: imx93-phyboard-nash: Current sense via iio-hwmon

Commit 21179eae56de ("arm64: dts: freescale: imx93-phyboard-nash: Add
current sense amplifier") added information about the current sensing
circuitry found on the board. Now, lets provide current sense reading
also via IIO-hwmon subsystem. This way, SoM current can be read directly
via sysfs property more conveniently for the customers. No need for them
to manually apply scaling factor calculations anymore.

Signed-off-by: Primoz Fiser <primoz.fiser@...ik.com>
---
 arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
index 71a0e9f270af..d05645f25bba 100644
--- a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
@@ -27,8 +27,9 @@ chosen {
 		stdout-path = &lpuart1;
 	};
 
-	current-sense {
+	curr_sens: current-sense {
 		compatible = "current-sense-amplifier";
+		#io-channel-cells = <0>;
 		io-channels = <&adc1 1>;
 		sense-gain-div = <2>;
 		sense-gain-mult = <50>;
@@ -44,6 +45,11 @@ flexcan1_tc: can-phy0 {
 		standby-gpios = <&gpio4 16 GPIO_ACTIVE_HIGH>;
 	};
 
+	iio-hwmon {
+		compatible = "iio-hwmon";
+		io-channels = <&curr_sens 0>;
+	};
+
 	reg_usdhc2_vmmc: regulator-usdhc2 {
 		compatible = "regulator-fixed";
 		gpio = <&gpio3 7 GPIO_ACTIVE_HIGH>;
-- 
2.34.1