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[108.47.66.231]) by mx.google.com with ESMTPSA id on3sm15663577pdb.71.2014.10.08.00.49.28 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 08 Oct 2014 00:49:30 -0700 (PDT) From: Mike Turquette To: viresh.kumar@linaro.org Cc: thomas.petazzoni@free-electrons.com, rjw@rjwysocki.net, linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, shawn.guo@linaro.org, sboyd@codeaurora.org, linux-arm-msm@vger.kernel.org, spk.linux@gmail.com, pramod.gurav@smartplayin.com, rob.herring@linaro.org, ezequiel.garcia@free-electrons.com, tawfik@marvell.com, nadavh@marvell.com, alior@marvell.com, morten.rasmussen@arm.com, dietmar.eggemann@arm.com, vincent.guittot@linaro.org, nicolas.pitre@linaro.org, linux-kernel@vger.kernel.org, tuukka.tikkanen@linaro.org, Mike Turquette Subject: [PATCH 2/2] cpufreq: new function to query driver for flags Date: Wed, 8 Oct 2014 00:48:54 -0700 Message-Id: <1412754534-14068-3-git-send-email-mturquette@linaro.org> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1412754534-14068-1-git-send-email-mturquette@linaro.org> References: <1412754534-14068-1-git-send-email-mturquette@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: mturquette@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.172 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , There are cases for CPUfreq driver flags to be exposed outside of the CPUfreq core code. In particular the CPUFREQ_NO_SLEEP flag can be used by CPUfreq governors to optimize when and how they call that drivers .target callback. In fact this knowledge is a requirement for the on-going work to initiate cpu frequency transitions from the scheduler. This patch implements a simple function to return the CPUfreq driver flags. While currently the flags are a u8, that could grow at a future date and cpufreq_driver_get_flags returns an int. Additionally the function needs to return an error in case no driver is registered. Signed-off-by: Mike Turquette --- drivers/cpufreq/cpufreq.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 9b471b2..f3b9042 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1980,6 +1980,15 @@ int cpufreq_driver_target(struct cpufreq_policy *policy, } EXPORT_SYMBOL_GPL(cpufreq_driver_target); +int cpufreq_driver_get_flags(void) +{ + if (!cpufreq_driver) + return -ENODEV; + + return cpufreq_driver->flags; +} +EXPORT_SYMBOL_GPL(cpufreq_driver_get_flags); + /* * when "event" is CPUFREQ_GOV_LIMITS */