From 21179eae56de418ea360e31f1b69f66fc16aa4e3 Mon Sep 17 00:00:00 2001 From: Primoz Fiser Date: Mon, 14 Jul 2025 12:36:24 +0200 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 Signed-off-by: Shawn Guo --- 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 475913cf0cb9e..71a0e9f270af2 100644 --- a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts +++ b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts @@ -27,6 +27,14 @@ 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>; -- 2.47.3