From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 07CBD559CB3; Fri, 16 Oct 2026 18:27:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792175254; cv=none; b=qeNSkKrBd9QwA3sJu5cz1XLXgPQ41LOuPpJvRs6tWKlRZJriS1GSfpK9Qt5t8DBfoJ94yaIyPrHt7mHhc7bnSc6MfFauT/4exDOe+g6webOTPAZ11qJbXkx72R5eakJB8IrBBA79smtVEcwW0eZphxFZsaOP0gCKWkSZivZq+Ig= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792175254; c=relaxed/simple; bh=L72770060tG1YWBMEpx+PQ5qVJqAP1qUPGT7jZu5ZpY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UPQ9GbhWob54zEydqh/tB9NkzL0cP7dzl6/S7krHJgd84JZFwhTXwyZfTO67tbrNXWSDk+T4jDQyJ2wwOYHdbPlnBvK4U2eEeS9h31rgsfYUsq33xoLOV1OdS5zo/ieiEs9C/U3iAZgZsyc8fFSdgDKChdjfAqjUIZRG0vGfWg0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=kqRp/384; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="kqRp/384" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A7B121516; Fri, 16 Oct 2026 11:27:28 -0700 (PDT) Received: from e142021.manchester.arm.com (e142021.arm.com [10.33.8.90]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 37DAB3F8C6; Fri, 16 Oct 2026 11:27:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1792175251; bh=L72770060tG1YWBMEpx+PQ5qVJqAP1qUPGT7jZu5ZpY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kqRp/384Q3Og8WrWM93ZAx3VllWEZ5LIYKt3tGkPw0McKB6FSlCsN1dqnKAX3rCIf OM7Q4sUhk8t4uw7DP7O8Q4x42OH6nNxnHyLhACOXY1VFCsogizTYaeKO+FZ+ug4v+a Ra464/Xz+VYiLucFuhs18frqcbXqZYDEIVx1hrOU= From: Andre Przywara To: Mark Rutland , Lorenzo Pieralisi , Sudeep Holla Cc: Salman Nabi , Vedashree Vidwans , Trilok Soni , Nirmoy Das , vsethi@nvidia.com, Varun Wadekar , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org Subject: [PATCH v5 3/8] dt-bindings: arm: Add Live Firmware Activation Date: Fri, 16 Oct 2026 19:27:07 +0100 Message-ID: <20261016182714.1835813-4-andre.przywara@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261016182714.1835813-1-andre.przywara@arm.com> References: <20261016182714.1835813-1-andre.przywara@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Arm Live Firmware Activation spec [1] describes updating firmware images during runtime, without requiring a reboot. Update images might be deployed out-of-band, for instance via a BMC, in this case the OS needs to be notified about the availability of a new image. Describe an interrupt that could be triggered by the platform, to notify about any changes. [1] https://developer.arm.com/documentation/den0147/latest/ Signed-off-by: Andre Przywara Reviewed-by: Rob Herring (Arm) --- .../devicetree/bindings/arm/arm,lfa.yaml | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/arm,lfa.yaml diff --git a/Documentation/devicetree/bindings/arm/arm,lfa.yaml b/Documentation/devicetree/bindings/arm/arm,lfa.yaml new file mode 100644 index 0000000000000..de97dc88d0b15 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/arm,lfa.yaml @@ -0,0 +1,50 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/arm/arm,lfa.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Arm Live Firmware Activation (LFA) + +maintainers: + - Andre Przywara + - Sudeep Holla + +description: + The Arm Live Firmware Activation (LFA) specification [1] describes a + firmware interface to activate an updated firmware at runtime, without + requiring a reboot. Updates might be supplied out-of-band, for instance + via a BMC, in which case the platform needs to notify an OS about pending + image updates. + [1] https://developer.arm.com/documentation/den0147/latest/ + +properties: + compatible: + const: arm,lfa + + interrupts: + maxItems: 1 + description: + The notification interrupt for changed firmware image status. For + an out-of-band firmware update, some system entity would signal + the availability of a firmware update to the host OS via this interrupt. + + This must be an edge-triggered IRQ. + +required: + - compatible + - interrupts + +additionalProperties: false + +examples: + - | + #include + + firmware { + firmware-update { + compatible = "arm,lfa"; + interrupts = ; + }; + }; +... -- 2.43.0