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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Dec 2025 04:47:02.7930 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a5fd0d39-cc23-49c0-eb9d-08de41152675 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: DS3PEPF0000C37A.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4430 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 --- .../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml | 6 ++++++ 1 file changed, 6 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..8fdf77c7935c 100644 --- a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml +++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml @@ -165,6 +165,12 @@ allOf: reg-names: false =20 else: + description: + For Versal IPI mailboxes, the "msg" register region is optional. + However, for successful message passing via mailbox, both the host= IPI + agent and the remote IPI agent must have the "msg" register region + defined. If either agent lacks the "msg" field, only notification-= based + communication (without message buffers) will work. properties: reg: items: --=20 2.43.0