From patchwork Thu Mar 27 15:38:34 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ashwin Chaugule X-Patchwork-Id: 3898381 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A19E1BF540 for ; Thu, 27 Mar 2014 15:40:46 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D035A20165 for ; Thu, 27 Mar 2014 15:40:45 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C4C1320240 for ; Thu, 27 Mar 2014 15:40:44 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WTCPK-0005Xl-Py; Thu, 27 Mar 2014 15:39:54 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WTCPA-0001Nz-Tt; Thu, 27 Mar 2014 15:39:44 +0000 Received: from mail-qg0-f45.google.com ([209.85.192.45]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WTCOj-0001Kl-FG for linux-arm-kernel@lists.infradead.org; Thu, 27 Mar 2014 15:39:19 +0000 Received: by mail-qg0-f45.google.com with SMTP id j5so2974263qga.18 for ; Thu, 27 Mar 2014 08:38:52 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=2mQ7291LxPNPlqcXn0872m9FuKvDah1lD6Ed6lLK36g=; b=gWUSSHW5CrefAApEl2n7CQvsgZCoOO8klsFUmuErbKjlO5MFTsfF4FqaPh8dctiEL+ FslP6fmHD/zOdXSJuMeBoRBrPrKj3ubgzSJwoJaU6XR7Uf0PgLJFcHDeJOUDToBBZYCI Wfm/PjuxdGXsLrM+KWnQNhBdUfWsK5VbtRHytWT6Cbb5Wlm+GIngKUyElTQ/iwsHk+Bx gBaMaxJxduOcZ5xA5N0V1mX3SGpm8DSqYd6KAJuh7bmvPtHMK6N5DdXka1UOg/ke/SEJ Drbi7dgFlUy3ukPLbA85x9Q/DNp0mjxSA8BLoIpFryAxX5g9RyXE7Pv3zjLUiGPm276q lutA== X-Gm-Message-State: ALoCoQnujuPLRMdf//NA9d+lpQhQ8faCY9GW3zJwtdNhqcsJTZm/d9mp3xtG5iftOjxdBoa5VSUa X-Received: by 10.229.230.68 with SMTP id jl4mr366940qcb.2.1395934732408; Thu, 27 Mar 2014 08:38:52 -0700 (PDT) Received: from localhost.localdomain (cpe-098-027-049-158.nc.res.rr.com. [98.27.49.158]) by mx.google.com with ESMTPSA id g7sm1499522qaf.14.2014.03.27.08.38.50 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 27 Mar 2014 08:38:51 -0700 (PDT) From: Ashwin Chaugule To: mark.rutland@arm.com Subject: [PATCH v2 2/3] Documentation: devicetree: Add new binding for PSCIv0.2 Date: Thu, 27 Mar 2014 11:38:34 -0400 Message-Id: <1395934715-31348-2-git-send-email-ashwin.chaugule@linaro.org> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1395934715-31348-1-git-send-email-ashwin.chaugule@linaro.org> References: <1395934715-31348-1-git-send-email-ashwin.chaugule@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140327_113917_715038_BBBCA2E2 X-CRM114-Status: UNSURE ( 9.69 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -1.9 (-) Cc: rob.herring@linaro.org, anup.patel@linaro.org, linaro-acpi@lists.linaro.org, Marc.Zyngier@arm.com, patches@linaro.org, Ashwin Chaugule , linux-arm-kernel@lists.infradead.org, christoffer.dall@linaro.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The PSCI v0.2+ spec defines standard values for PSCI function IDs. Add a new binding entry so that pre v0.2 implementations can use DT entries for function IDs and v0.2+ implementations use standard entries as defined by the PSCIv0.2 specification. Signed-off-by: Ashwin Chaugule Acked-by: Rob Herring --- Documentation/devicetree/bindings/arm/psci.txt | 35 +++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt index 433afe9..d01a90b 100644 --- a/Documentation/devicetree/bindings/arm/psci.txt +++ b/Documentation/devicetree/bindings/arm/psci.txt @@ -21,7 +21,15 @@ to #0. Main node required properties: - - compatible : Must be "arm,psci" + - compatible : should contain at least one of: + + * "arm,psci" : for implementations complying to PSCI versions prior to + 0.2. For these cases function IDs must be provided. + + * "arm,psci-0.2" : for implementations complying to PSCI 0.2. Function + IDs are not required and should be ignored by an OS with PSCI 0.2 + support, but are permitted to be present for compatibility with + existing software when "arm,psci" is later in the compatible list. - method : The method of calling the PSCI firmware. Permitted values are: @@ -45,6 +53,8 @@ Main node optional properties: Example: +Case 1: PSCI v0.1 only. + psci { compatible = "arm,psci"; method = "smc"; @@ -53,3 +63,26 @@ Example: cpu_on = <0x95c10002>; migrate = <0x95c10003>; }; + + +Case 2: PSCI v0.2 only + + psci { + compatible = "arm,psci-0.2"; + method = "smc"; + }; + +Case 3: PSCI v0.2 and PSCI v0.1. + + As described above, for compatibility with existing kernels, the + hypervisor will likely want to provide IDs, e.g. + + psci { + compatible = "arm,psci-0.2", "arm,psci"; + method = "hvc"; + + cpu_on = < arbitrary value >; + cpu_off = < arbitrary value >; + + ... + };