From patchwork Wed Nov 27 10:29:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ulf Hansson X-Patchwork-Id: 11263753 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 03FFB1863 for ; Wed, 27 Nov 2019 10:29:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D750720863 for ; Wed, 27 Nov 2019 10:29:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="hV6JyPoe" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726560AbfK0K31 (ORCPT ); Wed, 27 Nov 2019 05:29:27 -0500 Received: from mail-lj1-f194.google.com ([209.85.208.194]:47032 "EHLO mail-lj1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727116AbfK0K31 (ORCPT ); Wed, 27 Nov 2019 05:29:27 -0500 Received: by mail-lj1-f194.google.com with SMTP id e9so23825606ljp.13 for ; Wed, 27 Nov 2019 02:29:25 -0800 (PST) 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=hR3fATInnhJT0Il8OsjH3yU7lJcZN7xcMci8RIbbM2k=; b=hV6JyPoeJ6ScqrZKdsERvcTAjECHZPKrEpiECJjJ2opXh0u63rwgTFmXVvsdu2X0H5 ICa9gP/wcirISvdKCLUGE/oSc075kXCJPeVFk1ObygGjfw01gIFsrcO6TnfrHFBHoWH7 DKuK5ax/e4uTVk6L9WIaN3h5ifumDU4XlNesZNqqm8c8D/7Me9f0kHQCaK+30B43RfwD gfKgt3Uwxz1lWHtEj3Hpt//hH10XK3vYERtLGm136PpCMUIvS22JkORRZXKwpoE7WT6X AR7s38eXNR6p/BkAh2p5qx4ND2GJqCjIu427zkHIbuXE71HMxpb5zXF0EbXTFojvke0C GOuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=hR3fATInnhJT0Il8OsjH3yU7lJcZN7xcMci8RIbbM2k=; b=Dqg43z23P8ODN3eAbKlUtxgLCskxB3RwDApEq0PilNi9kfZZesbfevmaOYk8F00oDz IszZNJAP6yhhSdXxjyEKGtUHp5/LEQgtFyxIgbehAD0CAnK+sIUbhfM2gLuVxydKLaYD BGhuCymFqSh3DLD5qcjFQ9SJ/XbDJzjwxC0SzFjahBXQg+MDQp5fylxAgKjD2H8it5J9 GP99zjRSZHukFKPSm640Vy76zfZNbrwuD6fN0pebt9oo+wePZxQYXa2qogtlaAOuMSle 4PyvyMBV0X3sz3M8jGG0zJA0hQH0n6ssx2wcvPVcbTAax7jwXglM181q5PLEZHSC/70v lG7A== X-Gm-Message-State: APjAAAVghTmonIcZ53tms5VphFbRZZ5J1mzzyqMoC4aJnDhXa2FlZknT gwrTzJ8v3/fUoXPKeNZRUE606w== X-Google-Smtp-Source: APXvYqwCBgszickFdMaiVIID+IrQo2mOi4OX8ab6dEe54mVNp2DqUjt/6Yig54hA/QaPvMO1ZC4nzA== X-Received: by 2002:a2e:6c0c:: with SMTP id h12mr30985887ljc.24.1574850564180; Wed, 27 Nov 2019 02:29:24 -0800 (PST) Received: from uffe-XPS-13-9360.ideon.se ([85.235.10.227]) by smtp.gmail.com with ESMTPSA id t9sm6868260ljj.19.2019.11.27.02.29.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Nov 2019 02:29:23 -0800 (PST) From: Ulf Hansson To: Sudeep Holla , Lorenzo Pieralisi , Rob Herring , linux-pm@vger.kernel.org Cc: "Rafael J . Wysocki" , Daniel Lezcano , Mark Rutland , Lina Iyer , Vincent Guittot , Stephen Boyd , Andy Gross , Bjorn Andersson , Kevin Hilman , Ulf Hansson , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Lina Iyer Subject: [PATCH v3 04/13] of: base: Add of_get_cpu_state_node() to get idle states for a CPU node Date: Wed, 27 Nov 2019 11:29:05 +0100 Message-Id: <20191127102914.18729-5-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191127102914.18729-1-ulf.hansson@linaro.org> References: <20191127102914.18729-1-ulf.hansson@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The CPU's idle state nodes are currently parsed at the common cpuidle DT library, but also when initializing data for specific CPU idle operations, as in the PSCI cpuidle driver case and qcom-spm cpuidle case. To avoid open-coding, let's introduce of_get_cpu_state_node(), which takes the device node for the CPU and the index to the requested idle state node, as in-parameters. In case a corresponding idle state node is found, it returns the node with the refcount incremented for it, else it returns NULL. Moreover, for PSCI there are two options to describe the CPU's idle states [1], either via a flattened description or a hierarchical layout. Hence, let's take both options into account. [1] Documentation/devicetree/bindings/arm/psci.yaml Suggested-by: Sudeep Holla Co-developed-by: Lina Iyer Signed-off-by: Lina Iyer Reviewed-by: Rob Herring Reviewed-by: Daniel Lezcano Signed-off-by: Ulf Hansson Reviewed-by: Sudeep Holla --- Changes in v3: - None. --- drivers/of/base.c | 36 ++++++++++++++++++++++++++++++++++++ include/linux/of.h | 8 ++++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index 1d667eb730e1..0e4cdf0f3864 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -477,6 +477,42 @@ int of_cpu_node_to_id(struct device_node *cpu_node) } EXPORT_SYMBOL(of_cpu_node_to_id); +/** + * of_get_cpu_state_node - Get CPU's idle state node at the given index + * + * @cpu_node: The device node for the CPU + * @index: The index in the list of the idle states + * + * Two generic methods can be used to describe a CPU's idle states, either via + * a flattened description through the "cpu-idle-states" binding or via the + * hierarchical layout, using the "power-domains" and the "domain-idle-states" + * bindings. This function check for both and returns the idle state node for + * the requested index. + * + * In case an idle state node is found at @index, the refcount is incremented + * for it, so call of_node_put() on it when done. Returns NULL if not found. + */ +struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, + int index) +{ + struct of_phandle_args args; + int err; + + err = of_parse_phandle_with_args(cpu_node, "power-domains", + "#power-domain-cells", 0, &args); + if (!err) { + struct device_node *state_node = + of_parse_phandle(args.np, "domain-idle-states", index); + + of_node_put(args.np); + if (state_node) + return state_node; + } + + return of_parse_phandle(cpu_node, "cpu-idle-states", index); +} +EXPORT_SYMBOL(of_get_cpu_state_node); + /** * __of_device_is_compatible() - Check if the node matches given constraints * @device: pointer to node diff --git a/include/linux/of.h b/include/linux/of.h index 844f89e1b039..c669c0a4732f 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -351,6 +351,8 @@ extern const void *of_get_property(const struct device_node *node, int *lenp); extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread); extern struct device_node *of_get_next_cpu_node(struct device_node *prev); +extern struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, + int index); #define for_each_property_of_node(dn, pp) \ for (pp = dn->properties; pp != NULL; pp = pp->next) @@ -765,6 +767,12 @@ static inline struct device_node *of_get_next_cpu_node(struct device_node *prev) return NULL; } +static inline struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, + int index) +{ + return NULL; +} + static inline int of_n_addr_cells(struct device_node *np) { return 0;