linux-kernel - [PATCH] arm64: dts: apple: s8001: Add DWI backlight for J98a, J99a

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Message-Id: <20251231-b4-j98a-j99a-dwi-bl-v1-1-24793c2b99fc@gmail.com>
Date: Wed, 31 Dec 2025 02:30:42 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Sven Peter <sven@...nel.org>, Janne Grunau <j@...nau.net>, 
 Neal Gompa <neal@...pa.dev>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Nick Chan <towinchenmi@...il.com>
Subject: [PATCH] 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@...il.com>
---
 arch/arm64/boot/dts/apple/s8001-j98a-j99a.dtsi | 4 ++++
 arch/arm64/boot/dts/apple/s8001.dtsi           | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/s8001-j98a-j99a.dtsi b/arch/arm64/boot/dts/apple/s8001-j98a-j99a.dtsi
index e66a4c1c138fe82dcdd652d4d56a8f4583f660cb..67633c56a7238983517b36ba319a704424be07c5 100644
--- a/arch/arm64/boot/dts/apple/s8001-j98a-j99a.dtsi
+++ b/arch/arm64/boot/dts/apple/s8001-j98a-j99a.dtsi
@@ -9,6 +9,10 @@
  * Copyright (c) 2024, Nick Chan <towinchenmi@...il.com>
  */
 
+&dwi_bl {
+	status = "okay";
+};
+
 &ps_dcs4 {
 	apple,always-on; /* LPDDR4 interface */
 };
diff --git a/arch/arm64/boot/dts/apple/s8001.dtsi b/arch/arm64/boot/dts/apple/s8001.dtsi
index b5b00dca6ffa4caa1d504860693da001a8ced80e..209c7dd19b7c289096e22b3c86a825c53d19a78f 100644
--- a/arch/arm64/boot/dts/apple/s8001.dtsi
+++ b/arch/arm64/boot/dts/apple/s8001.dtsi
@@ -209,6 +209,13 @@ aic: interrupt-controller@...100000 {
 			power-domains = <&ps_aic>;
 		};
 
+		dwi_bl: backlight@...200080 {
+			compatible = "apple,s8000-dwi-bl", "apple,dwi-bl";
+			reg = <0x2 0x0e200080 0x0 0x8>;
+			power-domains = <&ps_dwi>;
+			status = "disabled";
+		};
+
 		pinctrl_ap: pinctrl@...100000 {
 			compatible = "apple,s8000-pinctrl", "apple,pinctrl";
 			reg = <0x2 0x0f100000 0x0 0x100000>;

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251231-b4-j98a-j99a-dwi-bl-b56c3075a4fb

Best regards,
-- 
Nick Chan <towinchenmi@...il.com>