linux-kernel - [PATCH v4 2/2] dt-bindings: Update scmi node description

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Date:   Thu, 7 Jul 2022 10:25:09 +0000
From:   Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "tomase@...inx.com" <tomase@...inx.com>,
        "benjamin.gaignard@...com" <benjamin.gaignard@...com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "fabio.estevam@....com" <fabio.estevam@....com>,
        "loic.pallardy@...com" <loic.pallardy@...com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        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 v4 2/2] dt-bindings: Update scmi node description

Add '#domain-cells' property description to the scmi node.
This property makes scmi node as domain controller provider, which allows
consumers to provide scmi node with the device_ids of the devices, which are
using scmi protocols to control clocks/resets/power-domains etc.
The device_ids could be used to set the device permissions for the
Fimware using BASE_SET_DEVICE_PERMISSIONS message (see 4.2.2.10 of [0]).
Device permissions management described in DEN 0056, Section 4.2.2.10 [0].

For SCMI this property is used by Trusted Agent to set the device permissions
for the 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>
---
Changes v1 -> V2:
   - update parameter name, made it xen-specific
   - add xen vendor bindings

Changes V2 -> V3:
   - update parameter name, make it generic
   - update parameter format, add link to controller
   - do not include xen vendor bindings as already upstreamed

Changes V3 -> V4:
   - introduce domain controller provider/consumer device tree bindings
   - making scmi node to act as domain controller provider when the
     device permissions should be configured
---
 .../bindings/firmware/arm,scmi.yaml           | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
index 5c4c6782e052..89589ed81b4e 100644
--- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
@@ -78,6 +78,14 @@ properties:
   '#size-cells':
     const: 0
 
+  '#domain-cells':
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Number of cells in a domain controller specifier.
+      Set const to 1 here for nodes providing the device id, needed for
+      the BASE_SET_DEVICE_PERMISSIONS message (see 4.2.2.10 of [0]).
+    const: 1
+
   arm,smc-id:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
@@ -344,4 +352,21 @@ examples:
         };
     };
 
+  - |
+    firmware {
+        scmi_link: scmi {
+            compatible = "arm,scmi-smc";
+            shmem = <&cpu_scp_lpri0 &cpu_scp_lpri1>;
+            arm,smc-id = <0xc3000001>;
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+            #domain-cells = <1>;
+        };
+    };
+
+    foo@0 {
+      reg = <0x0 0x10>;
+      domain-0 = <&scmi_link 1>;
+    };
 ...
-- 
2.27.0