arm64: dts: apple: s8001: Add DWI backlight for J98a, J99a

iPad Pro (12.9-inch) uses DWI backlight, while the 9.7-inch model does not.
Add DWI backlight node for s8001 and enable it for J98a and J99a.

Signed-off-by: Nick Chan <towinchenmi@gmail.com>
Link: https://patch.msgid.link/20251231-b4-j98a-j99a-dwi-bl-v1-1-24793c2b99fc@gmail.com
Signed-off-by: Sven Peter <sven@kernel.org>

Author: asdfugil

arch/arm64/boot/dts/apple/s8001-j98a-j99a.dtsi

@@ -9,6 +9,10 @@
  * Copyright (c) 2024, Nick Chan <towinchenmi@gmail.com>
  */
 
+&dwi_bl {
+	status = "okay";
+};
+
 &ps_dcs4 {
 	apple,always-on; /* LPDDR4 interface */
 };

arch/arm64/boot/dts/apple/s8001.dtsi

@@ -209,6 +209,13 @@
 			power-domains = <&ps_aic>;
 		};
 
+		dwi_bl: backlight@20e200080 {
+			compatible = "apple,s8000-dwi-bl", "apple,dwi-bl";
+			reg = <0x2 0x0e200080 0x0 0x8>;
+			power-domains = <&ps_dwi>;
+			status = "disabled";
+		};
+
 		pinctrl_ap: pinctrl@20f100000 {
 			compatible = "apple,s8000-pinctrl", "apple,pinctrl";
 			reg = <0x2 0x0f100000 0x0 0x100000>;