From patchwork Tue Jul 1 16:32:41 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viresh Kumar X-Patchwork-Id: 4460591 Return-Path: X-Original-To: patchwork-linux-arm-msm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 88B159F358 for ; Tue, 1 Jul 2014 16:36:41 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 91854201C8 for ; Tue, 1 Jul 2014 16:36:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 782352015A for ; Tue, 1 Jul 2014 16:36:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758322AbaGAQfb (ORCPT ); Tue, 1 Jul 2014 12:35:31 -0400 Received: from mail-pa0-f52.google.com ([209.85.220.52]:48998 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758575AbaGAQfZ (ORCPT ); Tue, 1 Jul 2014 12:35:25 -0400 Received: by mail-pa0-f52.google.com with SMTP id eu11so10907737pac.11 for ; Tue, 01 Jul 2014 09:35:25 -0700 (PDT) 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:in-reply-to:references; bh=MAGfG36RbB439UaqyLLjxGgwgDBXrnFdifXQOWl5jWY=; b=cbe4oStNg56FvYznZkUbjBLvMxP3sOIyWCuRVcS9+FXfjuntaDBaIfyLoDCRY1kM3T HQ7hbz9qzCz/7ONE32TGJ4XMtNU9y3ulRG7Y7mkSTHSR+ElezmY4z2/Nr0in5viyEioi RzMj96Lx/YXywY8R5tzcKAt+2f9WHGcSlMY6RcSMRj56m/6/mFENWM10++PHzhAB/Q7v KvRvck7I11UjWojZqs4L3smFmauMQKCmyhzg2wCCs0DgC20FTs9h2IBUaT8aE3INYrGw 5BnwU2q5+KGmG0LhovAOSC7CQB/fDJnAULu+I5UJbGURnTuxFQTLohHEjJAmYjJcwt2v PcYg== X-Gm-Message-State: ALoCoQk/7cYqphQOzVJh6HkkEQioapwyGrYUswaHE+LSE4J2alt8YQ+g6avetPNy5Jv37MJ91XwW X-Received: by 10.68.106.194 with SMTP id gw2mr63277072pbb.85.1404232524944; Tue, 01 Jul 2014 09:35:24 -0700 (PDT) Received: from localhost ([122.166.172.22]) by mx.google.com with ESMTPSA id xz7sm118508369pac.3.2014.07.01.09.35.18 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 01 Jul 2014 09:35:24 -0700 (PDT) From: Viresh Kumar To: rjw@rjwysocki.net, shawn.guo@linaro.org Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, arvind.chauhan@arm.com, sboyd@codeaurora.org, linux-arm-msm@vger.kernel.org, spk.linux@gmail.com, thomas.ab@samsung.com, nm@ti.com, t.figa@samsung.com, Viresh Kumar , devicetree@vger.kernel.org Subject: [PATCH 12/14] cpufreq: cpu0: Extend support beyond CPU0 Date: Tue, 1 Jul 2014 22:02:41 +0530 Message-Id: <89da404a3b8f545774f5782d901b8381caf02c07.1404231535.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.0.0.rc2 In-Reply-To: References: In-Reply-To: References: Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Most of the infrastructure is in place now, with only little left. How to find siblings ? Stephen Boyd suggested to compare "clocks" properties from CPU's DT node and siblings should match. This patch adds another routine find_siblings() which calls of_clk_shared_by_cpus() to find if CPUs share clock line or not. If of_clk_shared_by_cpus() returns error, we fallback to all CPUs sharing clock line assumption as existing platforms don't have "clocks" property in all CPU nodes and would fail from of_clk_shared_by_cpus(). Cc: devicetree@vger.kernel.org Signed-off-by: Viresh Kumar --- .../devicetree/bindings/cpufreq/cpufreq-cpu0.txt | 72 ++++++++++++++++++++-- drivers/cpufreq/cpufreq-cpu0.c | 35 ++++++++++- 2 files changed, 101 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt index f055515..4b83c1a 100644 --- a/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt @@ -1,11 +1,11 @@ -Generic CPU0 cpufreq driver +Generic cpufreq driver -It is a generic cpufreq driver for CPU0 frequency management. It +It is a generic cpufreq driver for frequency management. It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) -systems which share clock and voltage across all CPUs. +systems which may or maynot share clock and voltage across all CPUs. Both required and optional properties listed below must be defined -under node /cpus/cpu@0. +under node /cpus/cpu@x. Where x is the first cpu inside a cluster. Required properties: - operating-points: Refer to Documentation/devicetree/bindings/power/opp.txt @@ -19,9 +19,16 @@ Optional properties: - cooling-min-level: - cooling-max-level: Please refer to Documentation/devicetree/bindings/thermal/thermal.txt. +- clocks: If CPU clock is populated from DT, "clocks" property must be copied to + every cpu node sharing clock with cpu@x. Generic cpufreq driver compares + "clocks" to find siblings, i.e. to see which CPUs share clock/voltages. If + only cpu@0 contains "clocks" property it is assumed that all CPUs share clock + line. Examples: +1. All CPUs share clock/voltages + cpus { #address-cells = <1>; #size-cells = <0>; @@ -36,6 +43,8 @@ cpus { 396000 950000 198000 850000 >; + clocks = <&clock CLK_ARM_CLK>; + clock-names = "cpu"; clock-latency = <61036>; /* two CLK32 periods */ #cooling-cells = <2>; cooling-min-level = <0>; @@ -46,17 +55,72 @@ cpus { compatible = "arm,cortex-a9"; reg = <1>; next-level-cache = <&L2>; + clocks = <&clock CLK_ARM_CLK>; }; cpu@2 { compatible = "arm,cortex-a9"; reg = <2>; next-level-cache = <&L2>; + clocks = <&clock CLK_ARM_CLK>; }; cpu@3 { compatible = "arm,cortex-a9"; reg = <3>; next-level-cache = <&L2>; + clocks = <&clock CLK_ARM_CLK>; + }; +}; + + +2. All CPUs inside a cluster share clock/voltages, there are multiple clusters. + +cpus { + #address-cells = <1>; + #size-cells = <0>; + + cpu@0 { + compatible = "arm,cortex-a15"; + reg = <0>; + next-level-cache = <&L2>; + operating-points = < + /* kHz uV */ + 792000 1100000 + 396000 950000 + 198000 850000 + >; + clocks = <&clock CLK_ARM1_CLK>; + clock-names = "cpu"; + clock-latency = <61036>; /* two CLK32 periods */ + }; + + cpu@1 { + compatible = "arm,cortex-a15"; + reg = <1>; + next-level-cache = <&L2>; + clocks = <&clock CLK_ARM1_CLK>; + }; + + cpu@100 { + compatible = "arm,cortex-a7"; + reg = <100>; + next-level-cache = <&L2>; + operating-points = < + /* kHz uV */ + 792000 950000 + 396000 750000 + 198000 450000 + >; + clocks = <&clock CLK_ARM2_CLK>; + clock-names = "cpu"; + clock-latency = <61036>; /* two CLK32 periods */ + }; + + cpu@101 { + compatible = "arm,cortex-a7"; + reg = <101>; + next-level-cache = <&L2>; + clocks = <&clock CLK_ARM2_CLK>; }; }; diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c index 44633f6..b3f2bf0 100644 --- a/drivers/cpufreq/cpufreq-cpu0.c +++ b/drivers/cpufreq/cpufreq-cpu0.c @@ -177,6 +177,30 @@ try_again: return ret; } +/* + * Sets all CPUs as sibling if any cpu doesn't have a "clocks" property, + * Otherwise it matches "clocks" property to find siblings. + */ +static void find_siblings(struct cpufreq_policy *policy) +{ + int cpu, ret; + + for_each_possible_cpu(cpu) { + if (cpu == policy->cpu) + continue; + + ret = of_clk_shared_by_cpus(policy->cpu, cpu); + + /* Error while parsing nodes, fallback to set-all */ + if (ret < 0) { + cpumask_setall(policy->cpus); + return; + } else if (ret == 1) { + cpumask_set_cpu(cpu, policy->cpus); + } + } +} + static int cpu0_cpufreq_init(struct cpufreq_policy *policy) { struct cpufreq_frequency_table *freq_table; @@ -266,9 +290,16 @@ static int cpu0_cpufreq_init(struct cpufreq_policy *policy) policy->driver_data = priv; policy->clk = cpu_clk; - ret = cpufreq_generic_init(policy, freq_table, transition_latency); - if (ret) + + find_siblings(policy); + ret = cpufreq_table_validate_and_show(policy, freq_table); + if (ret) { + dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__, + ret); goto out_cooling_unregister; + } + + policy->cpuinfo.transition_latency = transition_latency; return 0;