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@norik.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
index 475913cf0cb9e8858f74f117103dcf0fc7f658cc..71a0e9f270af2edd91d429c47614738bb7f4d6db 100644 (file)
--- 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>;