From patchwork Thu Apr 17 19:15:45 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ashwin Chaugule X-Patchwork-Id: 4010431 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 BDB979F2BA for ; Thu, 17 Apr 2014 19:20:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C0E9020259 for ; Thu, 17 Apr 2014 19:20:02 +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 DF1AC201F9 for ; Thu, 17 Apr 2014 19:20:01 +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 1Warnq-0006Mu-Ci; Thu, 17 Apr 2014 19:16:54 +0000 Received: from mail-pa0-f50.google.com ([209.85.220.50]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WarnX-0006Ip-QY for linux-arm-kernel@lists.infradead.org; Thu, 17 Apr 2014 19:16:36 +0000 Received: by mail-pa0-f50.google.com with SMTP id kq14so684190pab.37 for ; Thu, 17 Apr 2014 12:16:11 -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=+GrXZvQNbJVHCKdPISVWBxa2JNuyqzUCcQfOAvfJt74=; b=Hh8ItUJXu2KeUp0WkziBIFDoQ32tKWnFc5lHImqH3XjBjBnWr265U7fc9n9Xb19yCZ L/bL1gRcpn5YpLRUe7rMQ33qoZ41WZ6cmHOF0JaITrH4M1ZqBPSc9d/yGMhFxQuC9XMc 9aH2Hpq0R55UVmDT215vDXfB6oMc32cntG2mDrKWG4KAc2u43DFlY+4ecs+xF5FB5Qjv tMrMPzHEw2E8RV0zVLcMZIUnnhHrxSR39/xUMKMEHxTijji8+/VX76qO2mLtlgnLqEC9 vlzIa//lraPHRsLH2RPmwyGb7MEpIa+Z3y7rTvCGQc0HRW/ns2TOdNbN9B30NFR+TI3O 2ztg== X-Gm-Message-State: ALoCoQnmaIp/r1c2nzl9GaGh7JZYybPM71Heif7Z/gIjoIIlW8lzKfP6HECwwBQ1P8mMU/omjpNv X-Received: by 10.68.113.194 with SMTP id ja2mr17638908pbb.30.1397762171078; Thu, 17 Apr 2014 12:16:11 -0700 (PDT) Received: from linaro5.qualcomm.com (rrcs-67-52-130-30.west.biz.rr.com. [67.52.130.30]) by mx.google.com with ESMTPSA id et3sm55157855pbc.52.2014.04.17.12.16.09 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 17 Apr 2014 12:16:10 -0700 (PDT) From: Ashwin Chaugule To: mark.rutland@arm.com Subject: [PATCH v6 2/3] Documentation: devicetree: Add new binding for PSCIv0.2 Date: Thu, 17 Apr 2014 15:15:45 -0400 Message-Id: <1397762146-8337-3-git-send-email-ashwin.chaugule@linaro.org> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1397762146-8337-1-git-send-email-ashwin.chaugule@linaro.org> References: <1397762146-8337-1-git-send-email-ashwin.chaugule@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140417_121635_909524_4B64A8C9 X-CRM114-Status: GOOD ( 11.58 ) X-Spam-Score: -0.7 (/) 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=-2.6 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 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 >; + + ... + };