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    Subject[PATCH v4 1/2] dt-bindings: firmware: arm,scmi: support for parameter in smc/hvc call
    Date
    Currently, smc/hvc calls are made with smc-id only. The parameters are
    all set to zeros. This patch defines a new compatible string that can
    be used to pass shmem address(4KB-page, offset) as two parameters in
    SMC/HVC doorbell.

    This is useful when multiple scmi instances are used with common smc-id.

    Signed-off-by: Nikunj Kela <quic_nkela@quicinc.com>
    ---
    Documentation/devicetree/bindings/firmware/arm,scmi.yaml | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
    index 5824c43e9893..ad776911f990 100644
    --- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
    +++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
    @@ -34,6 +34,10 @@ properties:
    - description: SCMI compliant firmware with ARM SMC/HVC transport
    items:
    - const: arm,scmi-smc
    + - description: SCMI compliant firmware with ARM SMC/HVC transport
    + with shmem address(4KB-page, offset) as parameters
    + items:
    + - const: arm,scmi-smc-param
    - description: SCMI compliant firmware with SCMI Virtio transport.
    The virtio transport only supports a single device.
    items:
    @@ -299,7 +303,9 @@ else:
    properties:
    compatible:
    contains:
    - const: arm,scmi-smc
    + enum:
    + - arm,scmi-smc
    + - arm,scmi-smc-param
    then:
    required:
    - arm,smc-id
    --
    2.17.1
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