From b496282ee4ad07311a13489e15b74fb7078d9a01 Mon Sep 17 00:00:00 2001 From: Aurelien Jarno Date: Wed, 29 Jul 2026 17:02:18 +0200 Subject: [PATCH] riscv: dts: spacemit: k1-bananapi-f3: fix maximum CPU core voltage On the Banana Pi BPI-F3 board, 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: 09a412d39748 ("riscv: dts: spacemit: define regulator constraints") Link: https://sashiko.dev/#/message/20260728211020.1248676-2-aurelien%40aurel32.net Cc: stable@vger.kernel.org Signed-off-by: Aurelien Jarno Reviewed-by: Yixun Lan Link: https://patch.msgid.link/20260729150722.1598630-2-aurelien@aurel32.net Signed-off-by: Yixun Lan --- arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts index e2961b7e0a3e..58035d886bf6 100644 --- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts +++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts @@ -237,14 +237,14 @@ pmic@41 { regulators { buck1_0v9: 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; };