linux-kernel - [PATCH 1/2] dt-bindings: firmware: arm,scmi: support parameter passing in smc/hvc

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Message-ID: <20230409181918.29270-2-quic_nkela@quicinc.com>
Date:   Sun, 9 Apr 2023 11:19:17 -0700
From:   Nikunj Kela <quic_nkela@...cinc.com>
To:     <sudeep.holla@....com>
CC:     <cristian.marussi@....com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Nikunj Kela <quic_nkela@...cinc.com>
Subject: [PATCH 1/2] dt-bindings: firmware: arm,scmi: support parameter passing in smc/hvc

Currently, smc/hvc calls are made with smc-id only. The parameters are
all set to zeros. This patch defines two optional device tree bindings,
that can be used to pass parameters in smc/hvc calls.

This is useful when multiple scmi instances are used with common smc-id.

Signed-off-by: Nikunj Kela <quic_nkela@...cinc.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 5824c43e9893..08c331a79b80 100644
--- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
@@ -115,6 +115,22 @@ properties:
     description:
       SMC id required when using smc or hvc transports
 
+  arm,smc32-params:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      An optional parameter list passed in smc32 or hvc32 calls
+    default: 0
+    minItems: 1
+    maxItems: 6
+
+  arm,smc64-params:
+    $ref: /schemas/types.yaml#/definitions/uint64-array
+    description:
+      An optional parameter list passed in smc64 or hvc64 calls
+    default: 0
+    minItems: 1
+    maxItems: 6
+
   linaro,optee-channel-id:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
-- 
2.17.1