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 8A74F3B0581; Wed, 29 Jul 2026 15:07:38 +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=1785337660; cv=none; b=Scgn6t5G4Z3TLnYSJdguuUu2Hke/NBEJsnwVTIeFtteU7+H5S4pUS4BLf34+bywZsNaqyqmALDs/J6BV007D9VBI2/FA4SUv7nqfIp66r0R1HuGOieT7/6i2cWr01HHtasw0lxlcCxslcG2xBkRGUXzVTn8c397fUUqvi5o0Ccg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785337660; c=relaxed/simple; bh=fcyjOsE+O5OJGA1fhyt2dxxhA4088vAD50LkXPSj1TI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MVd1XBcEhl1YjW/gQJllae40EPKQqnIl1IX/QUX89qDYExj+xHYiyTu89gvieMPMNgyb6yrzV9fvNH8zwykDfuhkBf9iFHGHhGUnJflAUidX2MYiBQRjxM4clLW/+bm6V9J+aA2gCgeKM+U3cNQ8cl/zucohc2gJpCcfMYiOPBo= 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=hcZD8+DQ; 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="hcZD8+DQ" 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=Z4aetQJjxNb2XMpbT0lkQBDawr5/gLZELQuBaUiYv2I=; b=hcZD8+DQaw/FSF7uiAYYwMwfVP Aizek+WnZGJg0om5mxqEN4bZZQwe6nidEHTYXBlPrhIcGCB/nbFawDSlSVNiUGkt8Ojbr6Z24QRXi Lir/oCXmeS9ml/5m9eOHdmjLLicCF+xSjliGRaZpO4ZQ8XkzStlbCoOEroV7vpJnf28Ud/ZEOWTBv 5RGx5lsnn1aFgj19c77SbY8OS9oRSBhnlefSK9mqea8fvSgc/uy/GYJ107M5TgMsZEbu02arXnFRG ncCBaXkyog59letgm5yYu2UQa/FOU4l+B9XkgGHXVXHEnsZPJD/3IY7HWWb4GtzRe7ZHaeMqaTlVs ppYK4WRQ==; 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-00000002eB8-2lTU; Wed, 29 Jul 2026 17:07:35 +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 , Javier Martinez Canillas 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 ARCHITECTURE), spacemit@lists.linux.dev (open list:RISC-V SPACEMIT SoC Support) Subject: [PATCH 2/6] riscv: dts: spacemit: k1-milkv-jupiter: fix maximum CPU core voltage Date: Wed, 29 Jul 2026 17:02:19 +0200 Message-ID: <20260729150722.1598630-3-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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On the Milk-V Jupiter 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: 7d307daa12b1 ("riscv: dts: spacemit: Define the P1 PMIC regulators for Milk-V Jupiter") 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-milkv-jupiter.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts b/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts index b61f5995ec771..c76b91ecb914d 100644 --- a/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts +++ b/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts @@ -211,14 +211,14 @@ 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