linux-kernel - [PATCH V6 1/2] dt-bindings: firmware: qcom,scm: Add optional interrupt

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Date:   Thu, 8 Dec 2022 12:10:30 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     <andersson@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>
CC:     <agross@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <robh+dt@...nel.org>, <konrad.dybcio@...ainline.org>,
        <robimarko@...il.com>, <quic_gurus@...cinc.com>,
        <quic_rjendra@...cinc.com>, Sibi Sankar <quic_sibis@...cinc.com>
Subject: [PATCH V6 1/2] dt-bindings: firmware: qcom,scm: Add optional interrupt

From: Guru Das Srinagesh <quic_gurus@...cinc.com>

Add an interrupt specification to the bindings to support the wait-queue
feature on SM8450 SoCs.

Signed-off-by: Guru Das Srinagesh <quic_gurus@...cinc.com>
Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
---

The interrupt property for scm firmware from a binding perspective is
completely optional i.e. not all tz fw running in the wild on sm8450
devices support this feature. The bootloader does the interrupt property
addition on sm8450 devices with wait-queue support.

v6:
- Fix subject of bindings [Krzysztof]
- Update commit message to include the SoC supporting the feature [Krzysztof]
- Make the interrupt property valid on SM8450 SoC [Krzysztof]
- Rebased on Krzysztof's narrow clocks and interconnect series.
- Drop R-b

v5:
- Pick up R-b

v4:
- Qualify bindings [Krzysztoff]

 .../devicetree/bindings/firmware/qcom,scm.yaml | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
index 8e6e9ebb343d..01c861f36983 100644
--- a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
+++ b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
@@ -73,6 +73,12 @@ properties:
   '#reset-cells':
     const: 1
 
+  interrupts:
+    description:
+      The wait-queue interrupt that firmware raises as part of handshake
+      protocol to handle sleeping SCM calls.
+    maxItems: 1
+
   qcom,dload-mode:
     $ref: /schemas/types.yaml#/definitions/phandle-array
     items:
@@ -162,6 +168,18 @@ allOf:
       properties:
         interconnects: false
 
+  # Interrupts
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - qcom,scm-sm8450
+    then:
+      properties:
+        interrupts: false
+
 required:
   - compatible
 
-- 
2.17.1