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client-ip=165.204.84.17; helo=satlexmb08.amd.com; pr=C Received: from satlexmb08.amd.com (165.204.84.17) by SJ1PEPF00001CEA.mail.protection.outlook.com (10.167.242.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9520.1 via Frontend Transport; Fri, 9 Jan 2026 06:23:11 +0000 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Fri, 9 Jan 2026 00:23:09 -0600 Received: from xhdharinit40.xilinx.com (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.17 via Frontend Transport; Fri, 9 Jan 2026 00:23:06 -0600 From: Harini T To: , , , , , CC: , , , , Harini T Subject: [PATCH V2] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement Date: Fri, 9 Jan 2026 11:52:59 +0530 Message-ID: <20260109062259.1769305-1-harini.t@amd.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00001CEA:EE_|DS0PR12MB7557:EE_ X-MS-Office365-Filtering-Correlation-Id: cfbafc7e-a0e5-4594-6c6d-08de4f479021 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|376014|36860700013|13003099007; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jan 2026 06:23:11.1230 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cfbafc7e-a0e5-4594-6c6d-08de4f479021 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CEA.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7557 Content-Type: text/plain; charset="utf-8" Add description clarifying that for Versal IPI mailboxes, both host and remote agents must have the "msg" register region defined for successful message passing. Without both, only notification-based communication works. Signed-off-by: Harini T Acked-by: Rob Herring (Arm) --- Changes in V2: - The description regarding the "msg" register region requirement for Versa= l IPI mailboxes was moved from the conditional schema section to the main descrip= tion block at the top of the YAML file. V1 link: https://lore.kernel.org/all/20251222044653.1757886-1-harini.t@amd.= com/ --- .../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mail= box.yaml b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbo= x.yaml index 04d6473d666f..a5205ee5ad0f 100644 --- a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml +++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml @@ -11,6 +11,17 @@ description: | messaging between two Xilinx Zynq UltraScale+ MPSoC IPI agents. Each IPI agent owns registers used for notification and buffers for message. =20 + For Versal devices, there are two types of IPI channels: + - Buffered channels: Support message passing and require the "msg" + register region to be present on both the host and remote IPI agents. + - Buffer-less channels: Support notification only and do not require t= he + "msg" register region. For these channels, the "msg" region should be + omitted. + + For message passing, both the host and remote IPI agents must define the= "msg" + register region. If either agent omits the "msg" region, only notificati= on + based communication is possible. + +-------------------------------------+ | Xilinx ZynqMP IPI Controller | +-------------------------------------+ --=20 2.43.0