linux-kernel - [PATCH 4/4] arm: dts: omap: Mark various register maps as dangerous

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Message-ID: <20251129142042.344359-5-richard@nod.at>
Date: Sat, 29 Nov 2025 15:20:42 +0100
From: Richard Weinberger <richard@....at>
To: linux-kernel@...r.kernel.org
Cc: linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org,
	arnd@...db.de,
	lee@...nel.org,
	dakr@...nel.org,
	rafael@...nel.org,
	gregkh@...uxfoundation.org,
	broonie@...nel.org,
	tony@...mide.com,
	rogerq@...nel.org,
	khilman@...libre.com,
	andreas@...nade.info,
	aaro.koskinen@....fi,
	conor+dt@...nel.org,
	krzk+dt@...nel.org,
	robh@...nel.org,
	Richard Weinberger <richard@....at>
Subject: [PATCH 4/4] arm: dts: omap: Mark various register maps as dangerous

These register maps contain registers where reads can cause an
imprecise async data abort.
Mark these register maps with has-inaccessible-regs to make sure
they cannot be accessed via debugfs and only by device drivers that
hopefully know exactly how and when access is allowed.

Signed-off-by: Richard Weinberger <richard@....at>
---
 arch/arm/boot/dts/ti/omap/dra7-l4.dtsi | 4 ++++
 arch/arm/boot/dts/ti/omap/dra7.dtsi    | 1 +
 arch/arm/boot/dts/ti/omap/dra74x.dtsi  | 1 +
 3 files changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/ti/omap/dra7-l4.dtsi b/arch/arm/boot/dts/ti/omap/dra7-l4.dtsi
index c9282f57ffa5e..bd037e199946e 100644
--- a/arch/arm/boot/dts/ti/omap/dra7-l4.dtsi
+++ b/arch/arm/boot/dts/ti/omap/dra7-l4.dtsi
@@ -69,6 +69,7 @@ scm_conf: scm_conf@0 {
 					#address-cells = <1>;
 					#size-cells = <1>;
 					ranges = <0 0x0 0x1400>;
+					has-inaccessible-regs;
 
 					pbias_regulator: pbias_regulator@e00 {
 						compatible = "ti,pbias-dra7", "ti,pbias-omap";
@@ -110,11 +111,13 @@ scm_conf1: scm_conf@...4 {
 					compatible = "syscon";
 					reg = <0x1c04 0x0020>;
 					#syscon-cells = <2>;
+					has-inaccessible-regs;
 				};
 
 				scm_conf_pcie: scm_conf@...4 {
 					compatible = "syscon";
 					reg = <0x1c24 0x0024>;
+					has-inaccessible-regs;
 				};
 
 				sdma_xbar: dma-router@b78 {
@@ -4306,6 +4309,7 @@ target-module@...0 {			/* 0x4ae0c000, ap 17 50.0 */
 			scm_wkup: scm_conf@0 {
 				compatible = "syscon";
 				reg = <0 0x1000>;
+				has-inaccessible-regs;
 			};
 		};
 	};
diff --git a/arch/arm/boot/dts/ti/omap/dra7.dtsi b/arch/arm/boot/dts/ti/omap/dra7.dtsi
index 711ce4c31bb1f..1b1f31608d37e 100644
--- a/arch/arm/boot/dts/ti/omap/dra7.dtsi
+++ b/arch/arm/boot/dts/ti/omap/dra7.dtsi
@@ -359,6 +359,7 @@ bandgap: bandgap@...021e0 {
 		dsp1_system: dsp_system@...00000 {
 			compatible = "syscon";
 			reg = <0x40d00000 0x100>;
+			has-inaccessible-regs;
 		};
 
 		dra7_iodelay_core: padconf@...4a000 {
diff --git a/arch/arm/boot/dts/ti/omap/dra74x.dtsi b/arch/arm/boot/dts/ti/omap/dra74x.dtsi
index cfb39dde49300..d814c31576797 100644
--- a/arch/arm/boot/dts/ti/omap/dra74x.dtsi
+++ b/arch/arm/boot/dts/ti/omap/dra74x.dtsi
@@ -47,6 +47,7 @@ ocp {
 		dsp2_system: dsp_system@...00000 {
 			compatible = "syscon";
 			reg = <0x41500000 0x100>;
+			has-inaccessible-regs;
 		};
 
 
-- 
2.51.0