From patchwork Wed Dec 11 15:43:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ulf Hansson X-Patchwork-Id: 11285423 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 F405D188B for ; Wed, 11 Dec 2019 15:44:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CF40021556 for ; Wed, 11 Dec 2019 15:44:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="KVepL9vs" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388761AbfLKPoA (ORCPT ); Wed, 11 Dec 2019 10:44:00 -0500 Received: from mail-lf1-f66.google.com ([209.85.167.66]:35511 "EHLO mail-lf1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731921AbfLKPoA (ORCPT ); Wed, 11 Dec 2019 10:44:00 -0500 Received: by mail-lf1-f66.google.com with SMTP id 15so17085433lfr.2 for ; Wed, 11 Dec 2019 07:43:58 -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=Ofbrgz68OSPrbND6/WhbxfBKi0bLlwB+/hz0+n8YJzw=; b=KVepL9vstN03XHppcxydjSKRLkFgwNOhFqMhTEnVlF1MReXK/9bNoLInJ8YP4E/Oja ZsW6VRW6o1OTBRvvY3Pk+F5pawI/QV//nAh+XSUsYvZyyHcT4x89o5sJIBMcUQRb2GmY q3FFC/XGyS6X8bjQylLBcBwEoXtkItkLrJCdTELVIh9uptrXS8Y6bz7BCWQUJCiWuS9+ 0HnCy/45OUr7AwyD/twItRhW6qCTqBU1ffy810aL/t37q+e8zskOr9aZG8I/TMXTfhT0 IgHIUiScQLkUlvprt8NBTDMSwKQ0ZagBxHs/8xctCRVLEI7+GdKbAawY6YKngYrmAxEc zIhg== 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=Ofbrgz68OSPrbND6/WhbxfBKi0bLlwB+/hz0+n8YJzw=; b=hSTpMMoNoYctEUO6o3bdf6bJ36H3dzmCntiRaQuN8wQXbcTTIJ4RVXMuJuCrz+owWX LeznZ7t8wZ8KpR7YBBjxl0+umqbBi4tnV6Vcm7oVLBom2vn4NiIDznEJMdGQHtvkeX18 DPbUVoigslLTKMUg09ZcafE778H+KyIxpO3BmGl0b8iRWfrqlOBK+Qv40skQv/6YqV6E AHdogb5VJQNhgUpyn9l2DaVQy5cD2YiDlcSBiQYlbonAYSJDTYAeYADItnEJ+eHVA39l zVGcNlfLxO9wqDBl2FCZyPOmusK42rTyI8NPjEmpJ94KL1U5j81mbAbQXmG22RzShDlE SBDw== X-Gm-Message-State: APjAAAWOd8RXd8nhvn/nauQkZUOvo2LwhRy/Oxe0u+KcEbldbYi71c/l RELawPVyAnqiqAFbkbwd7eLwLA== X-Google-Smtp-Source: APXvYqz89XHVxkLmuyY/NWdcwtGhitRaQeBPBPqirkbVbNQySVcoy9ANADV7MYrC0JZJfJfwa4yKGw== X-Received: by 2002:a05:6512:21d:: with SMTP id a29mr2713494lfo.186.1576079037661; Wed, 11 Dec 2019 07:43:57 -0800 (PST) Received: from localhost.localdomain (h-158-174-22-210.NA.cust.bahnhof.se. [158.174.22.210]) by smtp.gmail.com with ESMTPSA id b14sm1389608lff.68.2019.12.11.07.43.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Dec 2019 07:43:57 -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 v4 04/14] of: base: Add of_get_cpu_state_node() to get idle states for a CPU node Date: Wed, 11 Dec 2019 16:43:33 +0100 Message-Id: <20191211154343.29765-5-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191211154343.29765-1-ulf.hansson@linaro.org> References: <20191211154343.29765-1-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 v4: - 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 db7fbc0c0893..614f0c674995 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -489,6 +489,42 @@ 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;