linux-kernel - [PATCH] dt-bindings: access-controllers: add controller configuration property

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Message-ID: <20240716161427.237825-1-gatien.chevallier@foss.st.com>
Date: Tue, 16 Jul 2024 18:14:27 +0200
From: Gatien Chevallier <gatien.chevallier@...s.st.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Gatien Chevallier
	<gatien.chevallier@...s.st.com>
Subject: [PATCH] dt-bindings: access-controllers: add controller configuration property

Add a pattern property that allows to define several controller
configuration in the device tree. It allows run-time controller
reconfiguration for an authorized entity as in OP-TEE OS [1].

Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
Link: https://github.com/OP-TEE/optee_os/pull/6946 [1]
---
 .../access-controllers/access-controllers.yaml | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml b/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml
index 99e2865f0e46..88824719bb73 100644
--- a/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml
+++ b/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml
@@ -58,6 +58,13 @@ properties:
       A list of access controller specifiers, as defined by the
       bindings of the access-controllers provider.
 
+patternProperties:
+  ".*(?<=)-access-conf$":
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      Contains a list of inseparable access controller specifiers that forms
+      an access controller configuration.
+
 additionalProperties: true
 
 examples:
@@ -81,4 +88,15 @@ examples:
                                  <&bus_controller 1 3 5>;
             access-controller-names = "clock", "bus";
         };
+
+        uart5: serial@...00 {
+          reg = <0x60200 0x400>;
+          clocks = <&clk_serial2>;
+          access-controllers = <&bus_controller 0 0 0>, <&bus_controller 1 0 0>,
+                               <&clock_controller 2 3>;
+          default-access-conf = <&bus_controller 0 10 0>,
+                                <&bus_controller 1 10 0>;
+          shared-access-conf = <&bus_controller 0 256 4>,
+                               <&bus_controller 1 256 4>;
+        };
     };
-- 
2.25.1