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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: tJwR+bvJuA1BliMdUCl9r0BhbgdGOuL6xevrS0IyHbNCohcBgvRyKjbN7aWR66l03oIqYvDcUJPvHxTpnM9viAYHl2ZrBkzjXBYH11qFtVU2r2gLs2HD3zfee58A7ap95YVlFzD7dMNRg6IDHqXigZu0yypYUzRqB2fGYq5WQGbjxGZwjATMSW8B3ANZmyjZDBsKPquUR6EjMNm+y+89mhRTsnN+dTVVWsB5tawoO3GjaTiN3T5cujam8+fBlN7TuwLtPrFZ11a8+iEMxiZ2hcgwAudtx2wL9+gsZOqUhdg0Cm3LgHsAOTbVQ7FksaSPO7zBCQUO/8H6nRF1ABuTg4zLbmEWhIo0KVZHSfcHhD3dhBKwWc9nyfrbbFWXaXVsjj4faEP/ynmJnVGVFgQQbhPtjdR3iJzqTfSwQG0ePwUISimNTt0Cb7xKScoXR+8+ X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jun 2026 14:34:32.5001 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e6e63af9-7be5-4135-117b-08dec7c68d95 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509F6.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR08MB5930 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260611_073441_219724_BDF4D78E X-CRM114-Status: GOOD ( 15.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 29/05/2026 17:44, Jonathan Cameron wrote: > On Fri, 29 May 2026 10:50:49 +0100 > Ahmed Tiba wrote: >> .../devicetree/bindings/firmware/arm,ras-cper.yaml | 54 ++++++++++++++++++++++ >> MAINTAINERS | 5 ++ >> 2 files changed, 59 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/firmware/arm,ras-cper.yaml b/Documentation/devicetree/bindings/firmware/arm,ras-cper.yaml >> new file mode 100644 >> index 000000000000..3d4de096093f >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/firmware/arm,ras-cper.yaml >> @@ -0,0 +1,54 @@ >> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >> +%YAML 1.2 >> +--- >> +$id:http://devicetree.org/schemas/firmware/arm,ras-cper.yaml# >> +$schema:http://devicetree.org/meta-schemas/core.yaml# >> + >> +title: Arm RAS CPER provider >> + >> +maintainers: >> + - Ahmed Tiba >> + >> +description: >> + Arm Reliability, Availability and Serviceability (RAS) firmware can expose >> + a firmware-first CPER error source directly via DeviceTree. Firmware >> + provides the CPER Generic Error Status block and notifies the OS through >> + an interrupt. > I'd like some spec references in here if possible. I can add a reference to the UEFI CPER specification for the Generic Error Status record format. For the firmware-first DT description itself I do not have a more specific public reference to cite. >> + >> +properties: >> + compatible: >> + const: arm,ras-cper >> + >> + memory-region: >> + minItems: 1 >> + items: >> + - description: >> + CPER Generic Error Status block exposed by firmware. >> + - description: >> + Optional firmware-owned ack buffer used on platforms >> + where firmware needs an explicit "ack" handshake before overwriting >> + the CPER buffer. Firmware watches bit 0 and expects the OS to set it >> + once the current status block has been consumed. > Does the arm spec really make this optional? Can we constraint it to not be > just to make our lives easier? I've never been sure how you would actually > make a working platform without the ack support. I will update the binding to require both memory-region entries. Best regards, Ahmed