linux-kernel - [PATCH] arm64: dts: freescale: imx93-phyboard-nash: Add current sense amplifier

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Message-Id: <20250714103624.857493-1-primoz.fiser@norik.com>
Date: Mon, 14 Jul 2025 12:36:24 +0200
From: Primoz Fiser <primoz.fiser@...ik.com>
To: 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: devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	upstream@...ts.phytec.de
Subject: [PATCH] arm64: dts: freescale: imx93-phyboard-nash: Add current sense amplifier

There is a current sensing circuitry on the phyBOARD-Nash-i.MX93 capable
of measuring input current consumption of the phyCORE-i.MX93 SoM @ 3.3V.
Circuity consists of MAX4372 current-sense amplifier (50V/V) with two 70
mOhm shunts resistors in parallel configuration (effective R = 35 mOhm)
connected to the SoC internal 12-bit ADC channel #1 (Vref = 1.8V) via
voltage divider with ratio of 1/2. This results in a current scaling
factor of 0.502232142 mA/LSB.

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

diff --git a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
index 00143f201876..8de7e174976f 100644
--- a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
@@ -28,6 +28,14 @@ chosen {
 		stdout-path = &lpuart1;
 	};
 
+	current-sense {
+		compatible = "current-sense-amplifier";
+		io-channels = <&adc1 1>;
+		sense-gain-div = <2>;
+		sense-gain-mult = <50>;
+		sense-resistor-micro-ohms = <35000>;
+	};
+
 	flexcan1_tc: can-phy0 {
 		compatible = "ti,tcan1042";
 		#phy-cells = <0>;
-- 
2.34.1