From patchwork Tue Oct 25 15:26:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lina Iyer X-Patchwork-Id: 9394911 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DE56260231 for ; Tue, 25 Oct 2016 15:31:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D1A252966B for ; Tue, 25 Oct 2016 15:31:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C5AE429675; Tue, 25 Oct 2016 15:31:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 36C8C2966B for ; Tue, 25 Oct 2016 15:31:53 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bz3gA-0001sZ-5t; Tue, 25 Oct 2016 15:30:18 +0000 Received: from mail-pf0-x231.google.com ([2607:f8b0:400e:c00::231]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bz3d5-0007dJ-Qh for linux-arm-kernel@lists.infradead.org; Tue, 25 Oct 2016 15:27:15 +0000 Received: by mail-pf0-x231.google.com with SMTP id s8so121223157pfj.2 for ; Tue, 25 Oct 2016 08:26:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=zSQ/j5SlwPDRjzcKED+Rxq9enanqoZyfzaYaf43KtVg=; b=JjZX6y5azZaH+VXM3KNo9Uzjr5DmwLTk5mHaJrmLQEYEhAxO2P3a5C061S7upofAlO SfiyCaf7vex0qMFno8itu9D8r0YjAStUv3h4oi7C9nAHYDOqmMH2EbPig2hvVs9GumVm x66zOhn29wslaWZpsOlejlihp5bDjePfz4WCU= 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=zSQ/j5SlwPDRjzcKED+Rxq9enanqoZyfzaYaf43KtVg=; b=OPph6FTCpmsRkuZtgPR1jjyO+m6s0LxAlUvJXWVjFdiiwye3xNRG0UPfNBcE0LD80l Zo2ZeEN50ldU89T8MRqXVkoLlN732BmO7CcNjZIa9RXOjjqIeId4/53g7B7k+4/j+Jd1 hZs6hsXGwsF1Ygd9O6j01SFu23FZ9amZ/CX40mVNgFwhimw2PTWn2YMWNHtqgJQjPLdp a68FcFvPGlDDoeIAfKAEDpMKO2Lj2CvRpDHeSctOFx4iJcbsVZTAgKSSk6rtobPB4oo2 IVgNlUBWdojoqTtCN39jltSELGGSmDqrNVRaSgLM1zfm/zoIUQuptuR7cbO2n/xhxFAQ 6rgg== X-Gm-Message-State: ABUngvdbVuVGZgEE9Ge3aMvqypDvQezJJj9j+kne1Cc5+9gS2eoudnfqnQOOM7HPoYMc/Da+ X-Received: by 10.99.122.6 with SMTP id v6mr16557490pgc.170.1477409206612; Tue, 25 Oct 2016 08:26:46 -0700 (PDT) Received: from ubuntu.localdomain (i-global254.qualcomm.com. [199.106.103.254]) by smtp.gmail.com with ESMTPSA id s85sm34320569pfi.17.2016.10.25.08.26.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 25 Oct 2016 08:26:45 -0700 (PDT) From: Lina Iyer To: ulf.hansson@linaro.org, khilman@kernel.org, rjw@rjwysocki.net, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/4] PM / doc: Update device documentation for devices in IRQ safe PM domains Date: Tue, 25 Oct 2016 08:26:36 -0700 Message-Id: <1477409199-52182-2-git-send-email-lina.iyer@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1477409199-52182-1-git-send-email-lina.iyer@linaro.org> References: <1477409199-52182-1-git-send-email-lina.iyer@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161025_082708_186921_5B6A3043 X-CRM114-Status: GOOD ( 13.51 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lorenzo.pieralisi@arm.com, Juri.Lelli@arm.com, linux-arm-msm@vger.kernel.org, sboyd@codeaurora.org, brendan.jackman@arm.com, sudeep.holla@arm.com, andy.gross@linaro.org, Lina Iyer MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Update documentation to reflect the changes made to support IRQ safe PM domains. Signed-off-by: Lina Iyer Signed-off-by: Rafael J. Wysocki --- Documentation/power/devices.txt | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt index 8ba6625..73ddea3 100644 --- a/Documentation/power/devices.txt +++ b/Documentation/power/devices.txt @@ -607,7 +607,9 @@ individually. Instead, a set of devices sharing a power resource can be put into a low-power state together at the same time by turning off the shared power resource. Of course, they also need to be put into the full-power state together, by turning the shared power resource on. A set of devices with this -property is often referred to as a power domain. +property is often referred to as a power domain. A power domain may also be +nested inside another power domain. The nested domain is referred to as the +sub-domain of the parent domain. Support for power domains is provided through the pm_domain field of struct device. This field is a pointer to an object of type struct dev_pm_domain, @@ -629,6 +631,16 @@ support for power domains into subsystem-level callbacks, for example by modifying the platform bus type. Other platforms need not implement it or take it into account in any way. +Devices may be defined as IRQ-safe which indicates to the PM core that their +runtime PM callbacks may be invoked with disabled interrupts (see +Documentation/power/runtime_pm.txt for more information). If an IRQ-safe +device belongs to a PM domain, the runtime PM of the domain will be +disallowed, unless the domain itself is defined as IRQ-safe. However, it +makes sense to define a PM domain as IRQ-safe only if all the devices in it +are IRQ-safe. Moreover, if an IRQ-safe domain has a parent domain, the runtime +PM of the parent is only allowed if the parent itself is IRQ-safe too with the +additional restriction that all child domains of an IRQ-safe parent must also +be IRQ-safe. Device Low Power (suspend) States ---------------------------------