From patchwork Sun Feb 13 19:58:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Marussi X-Patchwork-Id: 542431 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20AC5C433EF for ; Sun, 13 Feb 2022 19:59:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238077AbiBMT7N (ORCPT ); Sun, 13 Feb 2022 14:59:13 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:39380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238081AbiBMT7M (ORCPT ); Sun, 13 Feb 2022 14:59:12 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 0A05B532E6; Sun, 13 Feb 2022 11:59:06 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C562E13D5; Sun, 13 Feb 2022 11:59:05 -0800 (PST) Received: from e120937-lin.home (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EC5DE3F70D; Sun, 13 Feb 2022 11:59:03 -0800 (PST) From: Cristian Marussi To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: 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, cristian.marussi@arm.com, Rob Herring , devicetree@vger.kernel.org Subject: [PATCH v4 4/8] dt-bindings: firmware: arm,scmi: Add atomic-threshold-us optional property Date: Sun, 13 Feb 2022 19:58:28 +0000 Message-Id: <20220213195832.27932-5-cristian.marussi@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220213195832.27932-1-cristian.marussi@arm.com> References: <20220213195832.27932-1-cristian.marussi@arm.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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. + 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>;