From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from hall.aurel32.net (hall.aurel32.net [195.154.119.183]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA59F3EC812; Wed, 29 Jul 2026 15:07:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.154.119.183 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785337659; cv=none; b=RfOkTTZ88ZQsJzBrn3XrO9AnzjYWji92Jok1/8813RvXbiHTxIpxE1BCzViTAvhuqFrsgVuqrDcF06m+b+eTwS2sQ0negY2bO71wPUAZYK+51YyBwR9/EyGM0iou9N2+qi8qq7PmtSSRpZNwe6v3yE+PjW9mLWQA0wHr1n74rGI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785337659; c=relaxed/simple; bh=uLF4/5M8BK//0PaR3lWeHDFhujQu4e0vEvyedKKMMbs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=U9ya/okGF340stFe5aZQJme5KHpygJ3y7lRcyFyu7ILqYLcDDBjtVwRR5oWqWndt9kDXtCyV4lomn1ZmwN12YeSvBLUQChBRuSXtX5XlFaOri142asn3zPUuyroYtQLkHSmmEdQtK29Yl3xnhG10IfCHElQ5/WvidbL4Y28W6fU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=aurel32.net; spf=pass smtp.mailfrom=aurel32.net; dkim=pass (2048-bit key) header.d=aurel32.net header.i=@aurel32.net header.b=EoQk1r90; arc=none smtp.client-ip=195.154.119.183 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=aurel32.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aurel32.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=aurel32.net header.i=@aurel32.net header.b="EoQk1r90" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=aurel32.net ; s=202004.hall; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Content-Type:From:Reply-To: Subject:Content-ID:Content-Description:X-Debbugs-Cc; bh=aAP1gRw0f/juH/GrkAVHhQx3XXlaFij+1lKD3oiCoMI=; b=EoQk1r90j4GLpmmKJJHFhrbjuE hNuQIAd6+6oY4LzLf0RmTnBqra6Q9hf0KYz8T/qxcYkbw9C2JYRsmG5kX1vo3DSaOQCu/QCib0q9c m4zu9Y1POB2RfcBJkBbivjh3j4jt0Qsg3+Efsl2S5dfkxLqOYRsBRXpf/+V9CiLh1l+ZA/EvdqLhx JGQ90KJM3AQyQeASVBZYvd88xdpjJIymwKbH1hbdY20w/sR/znC9JPsBBrYj7nf/iycvoWuK+OOIA wXcxcLzRB2wIf5thx0c/rDxdF4DQswXfv2uYvrGBpwtROyWu2vHRtrrickslw9Mo3xwVWiHQiG4Vi Hei3VhYg==; Received: from authenticated user by hall.aurel32.net with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wp5sd-00000002eB5-1JeV; Wed, 29 Jul 2026 17:07:35 +0200 From: Aurelien Jarno To: linux-kernel@vger.kernel.org, Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Alex Elder Cc: Aurelien Jarno , stable@vger.kernel.org, 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 1/6] riscv: dts: spacemit: k1-bananapi-f3: fix maximum CPU core voltage Date: Wed, 29 Jul 2026 17:02:18 +0200 Message-ID: <20260729150722.1598630-2-aurelien@aurel32.net> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260729150722.1598630-1-aurelien@aurel32.net> References: <20260729150722.1598630-1-aurelien@aurel32.net> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- 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 e2961b7e0a3eb..58035d886bf67 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; }; -- 2.53.0