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Tue, 15 Feb 2022 13:03:54 -0800 (PST) Received: from robh.at.kernel.org ([64.188.179.250]) by smtp.gmail.com with ESMTPSA id d3sm13122624ilg.23.2022.02.15.13.03.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Feb 2022 13:03:53 -0800 (PST) Received: (nullmailer pid 3917584 invoked by uid 1000); Tue, 15 Feb 2022 21:03:52 -0000 Date: Tue, 15 Feb 2022 15:03:52 -0600 From: Rob Herring To: Cristian Marussi Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, sudeep.holla@arm.com, james.quinlan@broadcom.com, Jonathan.Cameron@huawei.com, f.fainelli@gmail.com, etienne.carriere@linaro.org, vincent.guittot@linaro.org, souvik.chakravarty@arm.com, peter.hilber@opensynergy.com, igor.skalkin@opensynergy.com, devicetree@vger.kernel.org Subject: Re: [PATCH v4 4/8] dt-bindings: firmware: arm,scmi: Add atomic-threshold-us optional property Message-ID: References: <20220213195832.27932-1-cristian.marussi@arm.com> <20220213195832.27932-5-cristian.marussi@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220213195832.27932-5-cristian.marussi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220215_130356_159147_887EA820 X-CRM114-Status: GOOD ( 20.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sun, Feb 13, 2022 at 07:58:28PM +0000, Cristian Marussi wrote: > 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. > > Cc: Rob Herring > Cc: devicetree@vger.kernel.org > Signed-off-by: Cristian Marussi > --- > v3 --> v4 > - renamed property to atomic-threshold-us > v1 --> v2 > - rephrased the property description > --- > .../devicetree/bindings/firmware/arm,scmi.yaml | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml > index eae15df36eef..3ffa669b91af 100644 > --- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml > +++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml > @@ -81,6 +81,15 @@ properties: > '#size-cells': > const: 0 > > + atomic-threshold-us: > + $ref: /schemas/types.yaml#/definitions/uint32 > + 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. > + If left unconfigured defaults to zero. This can be expressed as 'default: 0'. > + > arm,smc-id: > $ref: /schemas/types.yaml#/definitions/uint32 > description: > @@ -264,6 +273,8 @@ examples: > #address-cells = <1>; > #size-cells = <0>; > > + atomic_threshold = <10000>; > + > scmi_devpd: protocol@11 { > reg = <0x11>; > #power-domain-cells = <1>; > -- > 2.17.1 > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel