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Date:   Wed, 16 Dec 2020 15:58:01 -0500
From:   Jim Quinlan <>
To:     Sudeep Holla <>,,
Cc:     Rob Herring <>, (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), (open list)
Subject: [PATCH v3 1/2] dt-bindings: arm: Add optional interrupt to smc/hvc SCMI transport

In normal use of smc/hvc transport in SCMI the message completion is
indicated by the return of the SMC call.  This commit provides for an
optional interrupt named "message-serviced" which is used instead to
indicate the completion of a message.

Signed-off-by: Jim Quinlan <>
 Documentation/devicetree/bindings/arm/arm,scmi.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt b/Documentation/devicetree/bindings/arm/arm,scmi.txt
index b5ce5b39bb9c..667d58e0a659 100644
--- a/Documentation/devicetree/bindings/arm/arm,scmi.txt
+++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt
@@ -31,6 +31,14 @@ Optional properties:
 - mbox-names: shall be "tx" or "rx" depending on mboxes entries.
+- interrupts : when using smc or hvc transports, this optional
+	 property indicates that msg completion by the platform is indicated
+	 by an interrupt rather than by the return of the smc call. This
+	 should not be used except when the platform requires such behavior.
+- interrupt-names : if "interrupts" is present, interrupt-names must also
+	 be present and have the value "a2p".
 See Documentation/devicetree/bindings/mailbox/mailbox.txt for more details
 about the generic mailbox controller and client driver bindings.

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