arm64: dts: apple: t600x: Add PWM controller

Adds PWM controller and keyboard backlight bindings for M1 Pro/Max MacBook Pros

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Acked-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Hector Martin <marcan@marcan.st>

Author: Sasha Finkelstein

arch/arm64/boot/dts/apple/t600x-die0.dtsi

@@ -71,6 +71,15 @@
 		power-domains = <&ps_sio_cpu>;
 	};
 
+	fpwm0: pwm@39b030000 {
+		compatible = "apple,t6000-fpwm", "apple,s5l-fpwm";
+		reg = <0x3 0x9b030000 0x0 0x4000>;
+		power-domains = <&ps_fpwm0>;
+		clocks = <&clkref>;
+		#pwm-cells = <2>;
+		status = "disabled";
+	};
+
 	i2c0: i2c@39b040000 {
 		compatible = "apple,t6000-i2c", "apple,i2c";
 		reg = <0x3 0x9b040000 0x0 0x4000>;

arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi

@@ -9,6 +9,8 @@
  * Copyright The Asahi Linux Contributors
  */
 
+#include <dt-bindings/leds/common.h>
+
 / {
 	aliases {
 		serial0 = &serial0;
@@ -34,6 +36,18 @@
 		device_type = "memory";
 		reg = <0x100 0 0x2 0>; /* To be filled by loader */
 	};
+
+	led-controller {
+		compatible = "pwm-leds";
+		led-0 {
+			pwms = <&fpwm0 0 40000>;
+			label = "kbd_backlight";
+			function = LED_FUNCTION_KBD_BACKLIGHT;
+			color = <LED_COLOR_ID_WHITE>;
+			max-brightness = <255>;
+			default-state = "keep";
+		};
+	};
 };
 
 &serial0 {
@@ -101,3 +115,7 @@
 		wp-inverted;
 	};
 };
+
+&fpwm0 {
+	status = "okay";
+};