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Thu, 7 Jul 2022 10:25:09 +0000 Received: from PA4PR03MB7136.eurprd03.prod.outlook.com ([fe80::2d63:5490:24b9:415b]) by PA4PR03MB7136.eurprd03.prod.outlook.com ([fe80::2d63:5490:24b9:415b%9]) with mapi id 15.20.5417.016; Thu, 7 Jul 2022 10:25:09 +0000 From: Oleksii Moisieiev To: "robh+dt@kernel.org" CC: Oleksii Moisieiev , "mcoquelin.stm32@gmail.com" , "alexandre.torgue@st.com" , "linus.walleij@linaro.org" , "gregkh@linuxfoundation.org" , "devicetree@vger.kernel.org" , "tomase@xilinx.com" , "benjamin.gaignard@st.com" , "broonie@kernel.org" , "arnd@arndb.de" , "shawnguo@kernel.org" , "fabio.estevam@nxp.com" , "loic.pallardy@st.com" , "mark.rutland@arm.com" , Sudeep Holla , Cristian Marussi , Stefano Stabellini , "linux-kernel@vger.kernel.org" Subject: [PATCH v4 2/2] dt-bindings: Update scmi node description Thread-Topic: [PATCH v4 2/2] dt-bindings: Update scmi node description Thread-Index: AQHYkevVP3S32fpdeUiTm/voQggjvw== Date: Thu, 7 Jul 2022 10:25:09 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 77cf61b7-000a-4817-8da6-08da6002f844 x-ms-traffictypediagnostic: DB8PR03MB6012:EE_ x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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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 --- 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>; + }; ...