From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C5F26C433FE for ; Sun, 13 Feb 2022 20:00:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=/bztDT9UBMFB9aMvQRz6a3oDW03LldMBPgOzyXpH924=; b=OQ2WsaRpWVRD6x yntbJK21XJ3p6i10jI2kBZC0Zcg4zS2QjSjg3YqTMukrFx+AMWwRYUqduULpwCtKN3+S1eVIjgEZI xavgiS+fxsXDVUsndpslJ5l+RSfgiYp0vFGtSvl865I5AKVwzyk1KaZPbrvvcy7E40NuiSaEIYGUT XFFOQ6JvftJD8wX19GsvhCgPpXJZfwTiju87+6cQVETWwQ66Wah2hgpTD9O2FWDfiOJGHDJHL3T3c UShH/LAnmQAjhx8JEhhwxnVKQbZTJ+9Jp+j85jb0/QvoiDko4EbKTtGI09vxWAIkqOhS7D3nQHirV Q4SKqBUyshfTNHdH4RHA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJL2A-00CPK2-6T; Sun, 13 Feb 2022 19:59:46 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJL1X-00CP7F-E1 for linux-arm-kernel@lists.infradead.org; Sun, 13 Feb 2022 19:59:08 +0000 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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220213_115907_567997_124974AB X-CRM114-Status: UNSURE ( 9.01 ) X-CRM114-Notice: Please train this message. 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: , MIME-Version: 1.0 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 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>; -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel