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From: Aurelien Jarno <aurelien@aurel32.net>
To: linux-kernel@vger.kernel.org, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>, Yixun Lan <dlan@kernel.org>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	Michael Opdenacker <michael.opdenacker@rootcommit.com>,
	Junhui Liu <junhui.liu@pigmoral.tech>
Cc: Aurelien Jarno <aurelien@aurel32.net>,
	devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND
	FLATTENED DEVICE TREE BINDINGS),
	linux-riscv@lists.infradead.org (open list:RISC-V SPACEMIT SoC
	Support),
	spacemit@lists.linux.dev (open list:RISC-V SPACEMIT SoC Support)
Subject: [PATCH 6/6] riscv: dts: spacemit: k1-bananapi-cm6: fix maximum CPU core voltage
Date: Wed, 29 Jul 2026 17:02:23 +0200	[thread overview]
Message-ID: <20260729150722.1598630-7-aurelien@aurel32.net> (raw)
In-Reply-To: <20260729150722.1598630-1-aurelien@aurel32.net>

On the Banana Pi BPI-CM6 module, the buck1 and buck2 voltage regulators,
which supply the CPU core voltage, are configured with a maximum output
voltage of 3.45V, while the highest operating point requires only
1.050V. This means that a kernel bug, OPP misconfiguration, or
privileged userspace could request a voltage above the safe operating
limit, causing possible permanent CPU damage.

Set the maximum regulator voltage to 1.050V instead.

Fixes: 46a8c01700ac ("riscv: dts: spacemit: k1: Add Banana Pi BPI-CM6 IO board")
Link: https://sashiko.dev/#/message/20260728211020.1248676-2-aurelien%40aurel32.net
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi b/arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi
index bf502c87040a3..81c40df2a3663 100644
--- a/arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi
@@ -114,14 +114,14 @@ pmic@41 {
 		regulators {
 			buck1 {
 				regulator-min-microvolt = <500000>;
-				regulator-max-microvolt = <3450000>;
+				regulator-max-microvolt = <1050000>;
 				regulator-ramp-delay = <5000>;
 				regulator-always-on;
 			};
 
 			buck2 {
 				regulator-min-microvolt = <500000>;
-				regulator-max-microvolt = <3450000>;
+				regulator-max-microvolt = <1050000>;
 				regulator-ramp-delay = <5000>;
 				regulator-always-on;
 			};
-- 
2.53.0


WARNING: multiple messages have this Message-ID (diff)
From: Aurelien Jarno <aurelien@aurel32.net>
To: linux-kernel@vger.kernel.org, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>, Yixun Lan <dlan@kernel.org>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	Michael Opdenacker <michael.opdenacker@rootcommit.com>,
	Junhui Liu <junhui.liu@pigmoral.tech>
Cc: Aurelien Jarno <aurelien@aurel32.net>,
	devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND
	FLATTENED DEVICE TREE BINDINGS),
	linux-riscv@lists.infradead.org (open list:RISC-V SPACEMIT SoC
	Support),
	spacemit@lists.linux.dev (open list:RISC-V SPACEMIT SoC Support)
Subject: [PATCH 6/6] riscv: dts: spacemit: k1-bananapi-cm6: fix maximum CPU core voltage
Date: Wed, 29 Jul 2026 17:02:23 +0200	[thread overview]
Message-ID: <20260729150722.1598630-7-aurelien@aurel32.net> (raw)
In-Reply-To: <20260729150722.1598630-1-aurelien@aurel32.net>

On the Banana Pi BPI-CM6 module, the buck1 and buck2 voltage regulators,
which supply the CPU core voltage, are configured with a maximum output
voltage of 3.45V, while the highest operating point requires only
1.050V. This means that a kernel bug, OPP misconfiguration, or
privileged userspace could request a voltage above the safe operating
limit, causing possible permanent CPU damage.

Set the maximum regulator voltage to 1.050V instead.

Fixes: 46a8c01700ac ("riscv: dts: spacemit: k1: Add Banana Pi BPI-CM6 IO board")
Link: https://sashiko.dev/#/message/20260728211020.1248676-2-aurelien%40aurel32.net
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi b/arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi
index bf502c87040a3..81c40df2a3663 100644
--- a/arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi
@@ -114,14 +114,14 @@ pmic@41 {
 		regulators {
 			buck1 {
 				regulator-min-microvolt = <500000>;
-				regulator-max-microvolt = <3450000>;
+				regulator-max-microvolt = <1050000>;
 				regulator-ramp-delay = <5000>;
 				regulator-always-on;
 			};
 
 			buck2 {
 				regulator-min-microvolt = <500000>;
-				regulator-max-microvolt = <3450000>;
+				regulator-max-microvolt = <1050000>;
 				regulator-ramp-delay = <5000>;
 				regulator-always-on;
 			};
-- 
2.53.0


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  parent reply	other threads:[~2026-07-29 15:08 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-29 15:02 [PATCH 0/6] riscv: dts: spacemit: fix maximum CPU core voltage for K1 boards Aurelien Jarno
2026-07-29 15:02 ` Aurelien Jarno
2026-07-29 15:02 ` [PATCH 1/6] riscv: dts: spacemit: k1-bananapi-f3: fix maximum CPU core voltage Aurelien Jarno
2026-07-29 15:02   ` Aurelien Jarno
2026-07-29 15:19   ` sashiko-bot
2026-07-29 15:02 ` [PATCH 2/6] riscv: dts: spacemit: k1-milkv-jupiter: " Aurelien Jarno
2026-07-29 15:02   ` Aurelien Jarno
2026-07-29 15:14   ` sashiko-bot
2026-07-29 15:02 ` [PATCH 3/6] riscv: dts: spacemit: k1-orangepi-rv2: " Aurelien Jarno
2026-07-29 15:02   ` Aurelien Jarno
2026-07-29 15:02 ` [PATCH 4/6] riscv: dts: spacemit: k1-musepi-pro: " Aurelien Jarno
2026-07-29 15:02   ` Aurelien Jarno
2026-07-29 15:02 ` [PATCH 5/6] riscv: dts: spacemit: k1-orangepi-r2s: " Aurelien Jarno
2026-07-29 15:02   ` Aurelien Jarno
2026-07-29 15:15   ` sashiko-bot
2026-07-29 15:02 ` Aurelien Jarno [this message]
2026-07-29 15:02   ` [PATCH 6/6] riscv: dts: spacemit: k1-bananapi-cm6: " Aurelien Jarno

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