dt-bindings: arm: Add optional interrupt to smc/hvc SCMI transport

In the normal use of smc/hvc as SCMI transport, the message completion
is indicated by the return of the SMC call. This binding provides for
an optional interrupt named "a2p" which can be used instead to indicate
the completion of a message.

Link: https://lore.kernel.org/r/20201222145603.40192-2-jim2101024@gmail.com
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
[sudeep.holla: minor wording changes to the commit log]
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt b/Documentation/devicetree/bindings/arm/arm,scmi.txt
index b5ce5b39bb9ca425531b8a3e15b5e00da5299209..667d58e0a659441d475ee0c2def630982d1d5017 100644 (file)
--- 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.