linux-kernel - [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20251222044653.1757886-1-harini.t@amd.com>
Date: Mon, 22 Dec 2025 10:16:53 +0530
From: Harini T <harini.t@....com>
To: <jassisinghbrar@...il.com>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <michal.simek@....com>, <shubhrajyoti.datta@....com>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <git@....com>, Harini T
	<harini.t@....com>
Subject: [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement

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 <harini.t@....com>
---
 .../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml           | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.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
 
     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:
-- 
2.43.0