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    Subject[PATCH v4 2/2] dt-bindings: Update scmi node description
    Date
    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@epam.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
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