From patchwork Thu Sep 6 09:38:06 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Figa X-Patchwork-Id: 1412691 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id C81573FC85 for ; Thu, 6 Sep 2012 09:42:02 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T9YXx-0004sY-0G; Thu, 06 Sep 2012 09:38:49 +0000 Received: from mailout3.samsung.com ([203.254.224.33]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T9YXb-0004o2-WD for linux-arm-kernel@lists.infradead.org; Thu, 06 Sep 2012 09:38:29 +0000 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0M9X00EBK9FQPD50@mailout3.samsung.com> for linux-arm-kernel@lists.infradead.org; Thu, 06 Sep 2012 18:38:27 +0900 (KST) X-AuditID: cbfee61b-b7f056d000002c30-fd-50486f12571f Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id 15.42.11312.21F68405; Thu, 06 Sep 2012 18:38:27 +0900 (KST) Received: from mcdsrvbld02.digital.local ([106.116.37.23]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0M9X00K2L9FLF240@mmp1.samsung.com> for linux-arm-kernel@lists.infradead.org; Thu, 06 Sep 2012 18:38:26 +0900 (KST) From: Tomasz Figa To: linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 3/3] ARM: EXYNOS: pm_domain: Bind devices to power domains using DT Date: Thu, 06 Sep 2012 11:38:06 +0200 Message-id: <1346924286-9584-4-git-send-email-t.figa@samsung.com> X-Mailer: git-send-email 1.7.10 In-reply-to: <1346924286-9584-1-git-send-email-t.figa@samsung.com> References: <1346924286-9584-1-git-send-email-t.figa@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrIJMWRmVeSWpSXmKPExsVy+t9jAV3hfI8Ag7e3WCw2Pb7G6sDosXlJ fQBjFJdNSmpOZllqkb5dAlfG9m99bAV7VCrO7t/I2MB4UbaLkZNDQsBE4uyG7ewQtpjEhXvr 2boYuTiEBBYxSjy8/YYRJCEksJlJYscZfRCbTUBN4nPDIzYQW0TAW2Lymb/sIA3MAg2MErNv TQRrEBYIlfi9fjoriM0ioCrxcdsK5i5GDg5eAUeJFzedIJbJSzy93wc2h1PASeLaxYmsELsc JVZOPcw8gZF3ASPDKkbR1ILkguKk9FwjveLE3OLSvHS95PzcTYxgjz+T3sG4qsHiEKMAB6MS D+/PfPcAIdbEsuLK3EOMEhzMSiK8lqYeAUK8KYmVValF+fFFpTmpxYcYpTlYlMR5nc7ZBQgJ pCeWpGanphakFsFkmTg4pRoYA6empy1LW+Wyj8v00CaZO52z3TJn/V6rvsGB/W5a9RaF4luP llszac03XslR7J0esDDUvmrxHge1eN4jUsv8uL1EJrtv1DCbcvBTRIDKnmOm8c+SdzzKlfwe sjKNVzVUqWnPKk6lUyExOUKKIVLSD/d8VGjd+Mi9xUKzdtKzHd939fxac+2MEktxRqKhFnNR cSIAj1zewPQBAAA= X-Spam-Note: CRM114 invocation failed X-Spam-Score: -6.9 (------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-6.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [203.254.224.33 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: rjw@sisk.pl, kyungmin.park@samsung.com, kgene.kim@samsung.com, thomas.abraham@linaro.org, Tomasz Figa X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch adds a way to specify bindings between devices and power domains using device tree. A device can be bound to particular power domain by adding a power-domain property containing a phandle to the domain. The device will be bound to the domain before binding a driver to it and unbound after unbinding a driver from it. Signed-off-by: Tomasz Figa Signed-off-by: Kyungmin Park Reviewed-by: Thomas Abraham --- .../bindings/arm/exynos/power_domain.txt | 13 +++- arch/arm/mach-exynos/pm_domains.c | 82 ++++++++++++++++++++++ 2 files changed, 94 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt index 843b546..8ed914f 100644 --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt @@ -4,14 +4,25 @@ Exynos processors include support for multiple power domains which are used to gate power to one or more peripherals on the processor. Required Properties: -- compatiable: should be one of the following. +- compatible: should be one of the following. * samsung,exynos4210-pd - for exynos4210 type power domain. - reg: physical base address of the controller and length of memory mapped region. +Node of a device using power domains must have a power-domain property defined +with a phandle to respective power domain. + Example: lcd0: power-domain-lcd0 { compatible = "samsung,exynos4210-pd"; reg = <0x10023C00 0x10>; }; + +Example of the node using power domain: + + node { + /* ... */ + power-domain = <&lcd0>; + /* ... */ + }; diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c index 5b7ce7e..7b3b8a3 100644 --- a/arch/arm/mach-exynos/pm_domains.c +++ b/arch/arm/mach-exynos/pm_domains.c @@ -19,6 +19,8 @@ #include #include #include +#include +#include #include #include @@ -83,14 +85,89 @@ static struct exynos_pm_domain PD = { \ } #ifdef CONFIG_OF +static void exynos_add_device_to_domain(struct exynos_pm_domain *pd, + struct device *dev) +{ + int ret; + + dev_dbg(dev, "adding to power domain %s\n", pd->pd.name); + + while(1) { + ret = pm_genpd_add_device(&pd->pd, dev); + if (ret != -EAGAIN) + break; + cond_resched(); + } + + pm_genpd_dev_need_restore(dev, true); +} + +static void exynos_remove_device_from_domain(struct device *dev) +{ + struct generic_pm_domain *genpd = dev_to_genpd(dev); + int ret; + + dev_dbg(dev, "removing from power domain %s\n", genpd->name); + + while(1) { + ret = pm_genpd_remove_device(genpd, dev); + if (ret != -EAGAIN) + break; + cond_resched(); + } +} + +static void exynos_read_domain_from_dt(struct device *dev) +{ + struct platform_device *pd_pdev; + struct exynos_pm_domain *pd; + struct device_node *node; + + node = of_parse_phandle(dev->of_node, "power-domain", 0); + if (!node) + return; + pd_pdev = of_find_device_by_node(node); + if (!pd_pdev) + return; + pd = platform_get_drvdata(pd_pdev); + exynos_add_device_to_domain(pd, dev); +} + +static int exynos_pm_notifier_call(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct device *dev = data; + + switch (event) { + case BUS_NOTIFY_BIND_DRIVER: + if (dev->of_node) + exynos_read_domain_from_dt(dev); + + break; + + case BUS_NOTIFY_UNBOUND_DRIVER: + exynos_remove_device_from_domain(dev); + + break; + } + return NOTIFY_DONE; +} + +static struct notifier_block platform_nb = { + .notifier_call = exynos_pm_notifier_call, +}; + static __init int exynos_pm_dt_parse_domains(void) { + struct platform_device *pdev; struct device_node *np; for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") { struct exynos_pm_domain *pd; int on; + pdev = of_find_device_by_node(np); + pd = kzalloc(sizeof(*pd), GFP_KERNEL); if (!pd) { pr_err("%s: failed to allocate memory for domain\n", @@ -105,10 +182,15 @@ static __init int exynos_pm_dt_parse_domains(void) pd->pd.power_on = exynos_pd_power_on; pd->pd.of_node = np; + platform_set_drvdata(pdev, pd); + on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN; pm_genpd_init(&pd->pd, NULL, !on); } + + bus_register_notifier(&platform_bus_type, &platform_nb); + return 0; } #else