Commit 0539884c authored by Cristian Marussi's avatar Cristian Marussi Committed by Sudeep Holla
Browse files

dt-bindings: firmware: arm,scmi: Add atomic-threshold-us optional property 

SCMI protocols in the platform can optionally signal to the OSPM agent
the expected execution latency for a specific resource/operation pair.

Introduce an SCMI system wide optional property to describe a global time
threshold which can be configured on a per-platform base to determine the
opportunity, or not, for an SCMI command advertised to have a higher
latency than the threshold, to be considered for atomic operations:
high-latency SCMI synchronous commands should be preferably issued in the
usual non-atomic mode.

Link: https://lore.kernel.org/r/20220217131234.50328-5-cristian.marussi@arm.com


Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarCristian Marussi <cristian.marussi@arm.com>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent 5a3b7185

Documentation/devicetree/bindings/firmware/arm,scmi.yaml

+10 −0
Original line number Diff line number Diff line
@@ -81,6 +81,14 @@ properties: 
  '#size-cells':

    const: 0



  atomic-threshold-us:

    description:

      An optional time value, expressed in microseconds, representing, on this

      platform, the threshold above which any SCMI command, advertised to have

      an higher-than-threshold execution latency, should not be considered for

      atomic mode of operation, even if requested.

    default: 0



  arm,smc-id:

    $ref: /schemas/types.yaml#/definitions/uint32

    description:
@@ -264,6 +272,8 @@ examples: 
            #address-cells = <1>;

            #size-cells = <0>;



            atomic-threshold-us = <10000>;



            scmi_devpd: protocol@11 {

                reg = <0x11>;

                #power-domain-cells = <1>;