linux-kernel - [PATCH 3/5] dt-bindings: firmware: arm,scmi: Introduce more transport properties

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Message-ID: <20241018080602.3952869-4-cristian.marussi@arm.com>
Date: Fri, 18 Oct 2024 09:06:00 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	arm-scmi@...r.kernel.org
Cc: sudeep.holla@....com,
	james.quinlan@...adcom.com,
	f.fainelli@...il.com,
	vincent.guittot@...aro.org,
	etienne.carriere@...com,
	peng.fan@....nxp.com,
	michal.simek@....com,
	quic_sibis@...cinc.com,
	quic_nkela@...cinc.com,
	dan.carpenter@...aro.org,
	Cristian Marussi <cristian.marussi@....com>,
	devicetree@...r.kernel.org,
	"Rob Herring (Arm)" <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 3/5] dt-bindings: firmware: arm,scmi: Introduce more transport properties

Depending on specific hardware and firmware design choices, it may be
possible for different platforms to end up having different requirements
regarding the same transport characteristics.

Introduce max-msg-size and max-msg properties to describe such platform
specific transport constraints, since they cannot be discovered otherwise.

Cc: devicetree@...r.kernel.org
Cc: Rob Herring (Arm) <robh@...nel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 .../devicetree/bindings/firmware/arm,scmi.yaml   | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
index 54d7d11bfed4..42852ed887f2 100644
--- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
@@ -131,6 +131,22 @@ properties:
       be a non-zero value if set.
     minimum: 1
 
+  max-msg-size:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      An optional value, expressed in bytes, representing the maximum size
+      allowed for the payload of messages transmitted on this transport.
+      If set it is recommended to be greater or equal than the minimum size
+      required to support all the messages defined by the set of protocols
+      implemented on this platform.
+
+  max-msg:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      An optional value representing the maximum number of concurrent in-flight
+      messages allowed by this transport. If set, the value should be non-zero.
+    minimum: 1
+
   arm,smc-id:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
-- 
2.46.1