From: Harini T <harini.t@amd.com>
To: <jassisinghbrar@gmail.com>, <robh@kernel.org>,
<krzk+dt@kernel.org>, <conor+dt@kernel.org>,
<michal.simek@amd.com>, <shubhrajyoti.datta@amd.com>
Cc: <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <git@amd.com>,
Harini T <harini.t@amd.com>
Subject: [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement
Date: Mon, 22 Dec 2025 10:16:53 +0530 [thread overview]
Message-ID: <20251222044653.1757886-1-harini.t@amd.com> (raw)
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@amd.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
next reply other threads:[~2025-12-22 4:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-22 4:46 Harini T [this message]
2025-12-22 9:09 ` [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement Krzysztof Kozlowski
2025-12-23 10:48 ` T, Harini
2026-02-08 10:36 ` Krzysztof Kozlowski
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