linux-kernel - [PATCH v2 2/2] dt-bindings: xen: Add xen,scmi-devid property description for SCMI

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Date:   Mon, 7 Mar 2022 08:17:44 +0000
From:   Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/2] dt-bindings: xen: Add xen,scmi-devid property
 description for SCMI

Document xen,scmi-devid property for the devices, using SCMI protocol
to work with clocks/resets/power-domains etc. This property is intended
to set the device_id, which should be used to manage device permissions
in the Firmware. Device permissions management described in DEN 0056,
Section 4.2.2.10 [0].

This property is used by Xen hypervisor, which works as trusted Agent, to
set permissions for the devices, passed-through to the Guest Domains,
which are non-trusted Agents. Trusted and non-trusted Agent terms described
in Section 4.1.1 [0].

[0] https://developer.arm.com/documentation/den0056/latest

Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@...m.com>
---
 .../bindings/firmware/xen,scmi-devid.yaml     | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/xen,scmi-devid.yaml

diff --git a/Documentation/devicetree/bindings/firmware/xen,scmi-devid.yaml b/Documentation/devicetree/bindings/firmware/xen,scmi-devid.yaml
new file mode 100644
index 000000000000..49dc9951b54d
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/xen,scmi-devid.yaml
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2022 EPAM Systems.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/xen,scmi-devid.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xen SCMI (System Control and Management Interface) Device ID binding
+
+maintainers:
+  - Oleksii Moisieiev <oleksii_moisieiev@...m.com>
+
+select: true
+
+description: |
+  SCMI device_id property is intended to set the device id, needed to manage
+  the device permissions via SCMI protocol in the firmware. The device_id
+  should match device ids, defined in the firmware so the device permissions
+  can be requested by sending BASE_SET_DEVICE_PERMISSIONS (see 4.2.2.10 of [0]).
+
+  This property is used by Xen hypervisor to set the device permissions for
+  the Guest Domains. Where Xen is trusted Agent and Guest Domains are
+  non-trusted Agents.
+
+  [0] https://developer.arm.com/documentation/den0056/latest
+
+properties:
+  xen,scmi-devid:
+    description: Identifier of the device, matching device id, defined in
+      the firmware.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+additionalProperties: true
+
+examples:
+  - |
+    ohci1: usb@...a0000 {
+        /* ... */
+        reg = <0xee0a0000 0x100>;
+        xen,scmi-devid = <11>;
+        clocks = <&scmi_clock 4>;
+    };
-- 
2.27.0