From patchwork Sun May 25 18:19:00 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoffer Dall X-Patchwork-Id: 4238961 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 7C4439F32B for ; Sun, 25 May 2014 18:24:37 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9DC4A201DE for ; Sun, 25 May 2014 18:24:36 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (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 C83C320179 for ; Sun, 25 May 2014 18:24:35 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wod3d-0007wx-PU; Sun, 25 May 2014 18:22:05 +0000 Received: from mail-la0-f48.google.com ([209.85.215.48]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wod1f-0004rb-G3 for linux-arm-kernel@lists.infradead.org; Sun, 25 May 2014 18:20:04 +0000 Received: by mail-la0-f48.google.com with SMTP id mc6so5336061lab.35 for ; Sun, 25 May 2014 11:19:40 -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=yH1c6XeZpIP174c9t2DDagO3No6xJkNQ5fdYjLYnKRA=; b=mIqrBUYRE77KoUKKD78XzvumL6dEtTwrOhChuDiXgzZ2l23S5j68MVvRZvLQGwRsdM XKWAXk30NLH2y5OnF87wYnRyZ2ZESyjXs1m7x2wmHtOdPBGRp5PhsdAzb9UZj8gGCCmq 1Xeq+kFPK1z6/1tir2vHD0Uxkbbs5rwdfQd1bjMzlH+h4BZIYnfFxAJR5j5u81y1Ucuo GKiN5uC/DaGwN+ijhcjoQVPqX6JFw+Dgu2QDs1QPRkl5q04SQcpFuD3jh9cifcuDfj5D 6BaIV9Bz4pHD/1IRVFU/ggjp9moiUkShR4QKW0PVOMlhoTB+JSlTfKod9RotVTtR9RzO o3kQ== X-Gm-Message-State: ALoCoQly3TKVnvbhMuAi5IlvpaCBNQ+kr79SsDRU/FoMRAK027LdDJ2ionSAhbZf35cqMquo++1Q X-Received: by 10.152.6.3 with SMTP id w3mr13997462law.34.1401041980544; Sun, 25 May 2014 11:19:40 -0700 (PDT) Received: from localhost.localdomain (x1-6-b8-c7-5d-cb-5a-ca.cpe.webspeed.dk. [2.104.6.253]) by mx.google.com with ESMTPSA id o1sm9683895lbw.27.2014.05.25.11.19.38 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 25 May 2014 11:19:39 -0700 (PDT) From: Christoffer Dall To: Paolo Bonzini , Gleb Natapov Subject: [PATCH 14/16] Documentation: devicetree: Add new binding for PSCIv0.2 Date: Sun, 25 May 2014 20:19:00 +0200 Message-Id: <1401041942-23471-15-git-send-email-christoffer.dall@linaro.org> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1401041942-23471-1-git-send-email-christoffer.dall@linaro.org> References: <1401041942-23471-1-git-send-email-christoffer.dall@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140525_112003_761240_E7B5861B X-CRM114-Status: GOOD ( 13.19 ) X-Spam-Score: -0.7 (/) Cc: Peter Maydell , Anup Patel , kvm@vger.kernel.org, Marc Zyngier , Ashwin Chaugule , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.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=-2.5 required=5.0 tests=BAYES_00,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 From: Ashwin Chaugule 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 Reviewed-by: Mark Rutland Acked-by: Rob Herring Acked-by: Catalin Marinas --- Documentation/devicetree/bindings/arm/psci.txt | 37 +++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt index 433afe9..b4a58f3 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 +63,28 @@ 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. + + A DTB may provide IDs for use by kernels without PSCI 0.2 support, + enabling firmware and hypervisors to support existing and new kernels. + These IDs will be ignored by kernels with PSCI 0.2 support, which will + use the standard PSCI 0.2 IDs exclusively. + + psci { + compatible = "arm,psci-0.2", "arm,psci"; + method = "hvc"; + + cpu_on = < arbitrary value >; + cpu_off = < arbitrary value >; + + ... + };