arm64: dts: freescale: imx8mp-toradex-smarc: add fan PWM configuration

Configure correctly the FAN pwm output (inverted).

Reviewed-by: Peng Fan <[email protected]>
Signed-off-by: Francesco Dolcini <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

Author: dolcini

arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dev.dts

@@ -3,6 +3,8 @@
 
 /dts-v1/;
 
+#include <dt-bindings/pwm/pwm.h>
+
 #include "imx8mp-toradex-smarc.dtsi"
 
 / {
@@ -205,9 +207,14 @@
 	status = "okay";
 
 	/* Fan controller */
-	fan@18 {
+	fan_controller: fan@18 {
 		compatible = "ti,amc6821";
 		reg = <0x18>;
+		#pwm-cells = <2>;
+
+		fan {
+			pwms = <&fan_controller 40000 PWM_POLARITY_INVERTED>;
+		};
 	};
 
 	/* Current measurement into module VDD */