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author | Cristian Marussi <cristian.marussi@arm.com> | 2022-02-17 16:12:30 +0300 |
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committer | Sudeep Holla <sudeep.holla@arm.com> | 2022-02-21 13:36:48 +0300 |
commit | 0539884ccc8ad4b94e78c8c7705058af1cf9307f (patch) | |
tree | 9d984fe20f34dd4980a90f74f83349612ce6197b /Documentation/devicetree/bindings/firmware | |
parent | 5a3b7185c47c061330bdd71233126181d55ed3d5 (diff) | |
download | linux-0539884ccc8ad4b94e78c8c7705058af1cf9307f.tar.xz |
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: Rob Herring <robh@kernel.org>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'Documentation/devicetree/bindings/firmware')
-rw-r--r-- | Documentation/devicetree/bindings/firmware/arm,scmi.yaml | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml index eae15df36eef..590743883802 100644 --- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml +++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml @@ -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>; |