From patchwork Wed Jun 22 19:36:40 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lina Iyer X-Patchwork-Id: 9193673 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 DA2D16075F for ; Wed, 22 Jun 2016 19:42:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C893728402 for ; Wed, 22 Jun 2016 19:42:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BD61A2840F; Wed, 22 Jun 2016 19:42:34 +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=ham 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 464E228416 for ; Wed, 22 Jun 2016 19:42:34 +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 1bFo1P-0005sz-6c; Wed, 22 Jun 2016 19:41:11 +0000 Received: from mail-pa0-x234.google.com ([2607:f8b0:400e:c03::234]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bFnyE-0001Zv-LY for linux-arm-kernel@lists.infradead.org; Wed, 22 Jun 2016 19:37:56 +0000 Received: by mail-pa0-x234.google.com with SMTP id b13so19608872pat.0 for ; Wed, 22 Jun 2016 12:37:34 -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=nDG4+1S/zooSNud+1+J4fXlSPDoOOjgBa7AT9LQtpwE=; b=khdr7RZ9QyDWH+Brd9TbQZKSJ/wm0tx8s2ZSca5eTyQU+pv2Hqy4NFODpiLoAObUHk 13+ijY544VmgAxUBoC9iUwFQR72M5kWd7+JPeWysXRBjI6eECsosReHEcwUDYesNAfhZ gU047QH8DK+UriTl+z0+zkoCtinojmi7h567U= 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=nDG4+1S/zooSNud+1+J4fXlSPDoOOjgBa7AT9LQtpwE=; b=UN54zZ5LUhCR1wN6IELAPqDS8kGAHW+YIr5/Y0DgKRpMWWnz2Oz+HROWQ+nNDPt1/f owDF+oCd/5WNX9HBMhUhDhS7OTw3RgI4UMGolToJLdk/4sRko5Tl1pKrMeA1lKbX2SFT u6TLE+yDbU/aeEUDUojwspFarAW72uQHhqa/KJqekRaBXKw8ObKQc4iyj3Y0gFcTIJR1 xKzzckwc/o/7wQtFnSDSlSNlR4wNDp41AGstTXF5fvEhDghYxa9m/Ytw3KMukjvgDNDh gW89JvL6CP1s4dzfeCbl5pgJhOI8uZLw2mHXqQLEJYBBYT7CtN/pcXaHClLAXwFNOpZu fqKQ== X-Gm-Message-State: ALyK8tJXBwRAFfqr5Q1hB/TFi7YU79YcblZ7ZiXoyNZLwwlgKi0CU9gAh0K3ClVX73qK3u6s X-Received: by 10.66.101.136 with SMTP id fg8mr36834796pab.144.1466624253930; Wed, 22 Jun 2016 12:37:33 -0700 (PDT) Received: from ubuntu.localdomain ([172.56.9.151]) by smtp.gmail.com with ESMTPSA id t4sm1563368paw.32.2016.06.22.12.37.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 22 Jun 2016 12:37:32 -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 05/14] PM / doc: update device documentation for devices in IRQ safe PM domains Date: Wed, 22 Jun 2016 13:36:40 -0600 Message-Id: <1466624209-27432-6-git-send-email-lina.iyer@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1466624209-27432-1-git-send-email-lina.iyer@linaro.org> References: <1466624209-27432-1-git-send-email-lina.iyer@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160622_123754_977473_C9FA561F X-CRM114-Status: GOOD ( 11.64 ) 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: k.kozlowski@samsung.com, lorenzo.pieralisi@arm.com, ahaslam@baylibre.com, linux-arm-msm@vger.kernel.org, sboyd@codeaurora.org, geert@linux-m68k.org, Lina Iyer , andy.gross@linaro.org, mtitinger@baylibre.com 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 --- Documentation/power/devices.txt | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt index 8ba6625..a622136 100644 --- a/Documentation/power/devices.txt +++ b/Documentation/power/devices.txt @@ -607,7 +607,17 @@ 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. + +Devices, by default, operate in process context. If a device can operate in +IRQ safe context that has to be explicitly indicated by setting the irq_safe +boolean inside struct generic_pm_domain to be true. Power domains by default, +operate in process context but could have devices that are IRQ safe. Such +power domains cannot be powered on/off during runtime PM. On the other hand, +IRQ safe PM domains that have IRQ safe devices may be powered off when all +the devices are in idle. An IRQ safe domain may only be attached as a +subdomain to another IRQ safe 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,