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 2D86A38DC6E; Wed, 29 Jul 2026 15:07:54 +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=1785337676; cv=none; b=rFIsX6iQatX0mJZSFbcz8U2G6TiRnoSiEyNTQubm+5d2gz12UeHdhkLA38V0zwd1FQaffdII+vCDdbVZ/JXrwrl5F3TXHKqbCMtVSp7onaOVqrYgIBeVdZrvY/Z7uWWEkrLHpz8C/g4v6A2fFm+fCDgwbyy5tR/VqeaAOgm1h1A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785337676; c=relaxed/simple; bh=i3ZwOtiG0DJRMxuUSa/p4d8MmTTdtm5iN7FMXYe+4EE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uKni2JyQ2L7T1v7MCsQzCpGi8upq2B/50Lp55J96W9JtjPY9dFVUxoIiUo4qdWb/5gWZ+6N4Pp4mkUWf5JbDEpwSk3zUAKHrMl59fadef2uaSj5XqY+TB8E8tt/BunUYj6TwicAePv234C1ADKkFan9Pvk8rSHbc8qiOrwovWt4= 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=RRH9y1FK; 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="RRH9y1FK" 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=VombVeVEGFL3LwEWi5uWJnDV/Y88u6pNgKzx+naWxCk=; b=RRH9y1FKHlID37WPVQWnY49VZy Ox8LFsOz0/7ex0L43EOH3FZOOK8UjJx6n/kV+yqPx6BQIIgIvjfrpl8CNU3pg8WJ8ugNPL9RzPM39 8U46L8zIHcEmVrDZ5hHBTGlAMBMhieTc2HBT7ZUsmMZv1ivBh6yhLGldFUAFshRFVlI3xRd3XoOzg DZoAd+AvVOV6ZL/jprFX/8aUy2rb4LPHao9oeVcCBmVl8h1ZyD8lLNxd10u9z9KCBtV3ZXDaoj8nu Ac6uNvveSJeHiJda+SX2yP5fApcuVM7EN6mqTGtFADJyXQhWfH0m5s2aqRy+hPLA3hY9h1GQs+A1J A8NvgSlg==; 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 1wp5su-00000002eC8-1HXQ; Wed, 29 Jul 2026 17:07:52 +0200 From: Aurelien Jarno To: linux-kernel@vger.kernel.org, Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Yixun Lan , Andre Heider 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 4/6] riscv: dts: spacemit: k1-musepi-pro: fix maximum CPU core voltage Date: Wed, 29 Jul 2026 17:02:21 +0200 Message-ID: <20260729150722.1598630-5-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 MusePi Pro 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: e2dac7c7a3a8 ("riscv: dts: spacemit: k1-musepi-pro: add PMIC and power infrastructure") 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-musepi-pro.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts index 3078ffb5cb878..246f8f2ab62b9 100644 --- a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts +++ b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts @@ -180,14 +180,14 @@ 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