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

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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: Rob Herring <robh@kernel.org>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2022-02-17 13:12:30 +00:00 committed by Sudeep Holla
parent 5a3b7185c4
commit 0539884ccc
1 changed files with 10 additions and 0 deletions
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10
Documentation/devicetree/bindings/firmware/arm,scmi.yaml
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@ -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>;