linux-kernel - [PATCH 1/3] dt-bindings: firmware: Add bindings for ARM FFA

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Message-Id: <505bb9d66e8d4d8e505201eced6751b6fd6b1dcf.1737441631.git.viresh.kumar@linaro.org>
Date: Tue, 21 Jan 2025 12:26:38 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc: Vincent Guittot <vincent.guittot@...aro.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Bill Mills <bill.mills@...aro.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] dt-bindings: firmware: Add bindings for ARM FFA

This adds DT bindings for ARM's FFA framework. The bindings are used to
provide a reserved memory region per FFA device.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 .../devicetree/bindings/firmware/arm,ffa.yaml | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/arm,ffa.yaml

diff --git a/Documentation/devicetree/bindings/firmware/arm,ffa.yaml b/Documentation/devicetree/bindings/firmware/arm,ffa.yaml
new file mode 100644
index 000000000000..b88d6cec7e16
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/arm,ffa.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2021 ARM Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/arm,ffa.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm Firmware Framework for A-class
+
+maintainers:
+  - Viresh Kumar <viresh.kumar@...aro.org>
+
+description: |
+  ARM FFA (Arm Firmware Framework for A-class) is a framework designed to
+  facilitate communication and resource sharing between various software
+  components in an Arm system, such as operating systems, hypervisors, and
+  trusted execution environments (TEEs). It's particularly used in systems
+  leveraging the Armv8-A architecture and later.
+
+  This binding is intended to define the interface the firmware implementing the
+  FFA provide in the device tree.
+
+  https://developer.arm.com/documentation/den0077/
+
+properties:
+  $nodename:
+    pattern: '^ffa(-[a-z0-9]+)?$'
+
+  compatible:
+    const: arm,ffa
+
+  vm-id:
+    description: Virtual machine identifier.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  uuid:
+    description: Universally Unique Identifier.
+    $ref: /schemas/types.yaml#/definitions/uint32-matrix
+    minItems: 4
+    maxItems: 4
+
+  memory-region:
+    maxItems: 1
+    description:
+      Reserved memory allocated for sharing with other software components.
+
+additionalProperties: false
+
+required:
+  - compatible
+  - vm-id
+  - uuid
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        ffa_2_mem: ffamem@...00000 {
+            compatible = "restricted-dma-pool";
+            reg = <0x81000000 0x00800000>;
+        };
+    };
+
+    firmware {
+        ffa {
+            compatible = "arm,ffa";
+            vm-id = <2>;
+            uuid = <0xc5b82091 0x48bbd4fe 0x244de7b7 0xbe28bb6e>;
+            memory-region = <&ffa_2_mem>;
+        };
+    };
+...
-- 
2.31.1.272.g89b43f80a514