linux-kernel - [PATCH 1/4] arm64: zynqmp: Disable coresight by default

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Message-ID: <7e308b8efe977c4912079b4d1b1ab3d24908559e.1756799774.git.michal.simek@amd.com>
Date: Tue, 2 Sep 2025 09:56:18 +0200
From: Michal Simek <michal.simek@....com>
To: <linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
	<michal.simek@...inx.com>, <git@...inx.com>
CC: Quanyang Wang <quanyang.wang@...driver.com>, Conor Dooley
	<conor+dt@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring
	<robh@...nel.org>, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE
 BINDINGS" <devicetree@...r.kernel.org>, "moderated list:ARM/ZYNQ
 ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 1/4] arm64: zynqmp: Disable coresight by default

From: Quanyang Wang <quanyang.wang@...driver.com>

When secure-boot mode of bootloader is enabled, the registers of
coresight are not permitted to access that's why disable it by default.

Signed-off-by: Quanyang Wang <quanyang.wang@...driver.com>
Signed-off-by: Michal Simek <michal.simek@....com>
---

 arch/arm64/boot/dts/xilinx/zynqmp.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
index 5f26649c9e11..938b014ca923 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
+++ b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
@@ -550,6 +550,7 @@ cpu0_debug: debug@...10000 {
 			reg = <0x0 0xfec10000 0x0 0x1000>;
 			clock-names = "apb_pclk";
 			cpu = <&cpu0>;
+			status = "disabled";
 		};
 
 		cpu1_debug: debug@...10000 {
@@ -557,6 +558,7 @@ cpu1_debug: debug@...10000 {
 			reg = <0x0 0xfed10000 0x0 0x1000>;
 			clock-names = "apb_pclk";
 			cpu = <&cpu1>;
+			status = "disabled";
 		};
 
 		cpu2_debug: debug@...10000 {
@@ -564,6 +566,7 @@ cpu2_debug: debug@...10000 {
 			reg = <0x0 0xfee10000 0x0 0x1000>;
 			clock-names = "apb_pclk";
 			cpu = <&cpu2>;
+			status = "disabled";
 		};
 
 		cpu3_debug: debug@...10000 {
@@ -571,6 +574,7 @@ cpu3_debug: debug@...10000 {
 			reg = <0x0 0xfef10000 0x0 0x1000>;
 			clock-names = "apb_pclk";
 			cpu = <&cpu3>;
+			status = "disabled";
 		};
 
 		/* GDMA */
-- 
2.43.0