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arm64: dts: freescale: imx93-phyboard-nash: Add current sense amplifier

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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@norik.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Primoz Fiser
2025-07-14 12:36:24 +02:00
committed by Shawn Guo
parent d1c1400bd3
commit 21179eae56
1 changed files with 8 additions and 0 deletions
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8
arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
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@@ -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>;