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path: root/drivers/devfreq/devfreq-event.c
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2017-08-28PM / devfreq: Convert to using %pOF instead of full_nameRob Herring
Now that we have a custom printf format specifier, convert users of full_name to use %pOF instead. This is preparation to remove storing of the full path string for each node. Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: linux-pm@vger.kernel.org
2017-01-31PM / devfreq: Simplify the sysfs name of devfreq-event deviceChanwoo Choi
This patch just removes '.' character from the sysfs name of devfreq-event device as following. Usually, the subsystem uses the similiar naming style such as {framework name}{Number}. - old : /sys/class/devfreq-event/event.(X) - new : /sys/class/devfreq-event/event(X) And this patch initializes the value of 'event_no' with -1 in order to remove the unneeded operation (-1) when calling the atomic_inc_return(&event_no). Lastly, this patch adds the ABI document for devfreq-event class. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2016-07-06PM / devfreq: make devfreq-event explicitly non-modularPaul Gortmaker
The Kconfig currently controlling compilation of this code is: menuconfig PM_DEVFREQ_EVENT bool "DEVFREQ-Event device Support" ...meaning that it currently is not being built as a module by anyone. Lets remove the modular code that is essentially orphaned, so that when reading the driver there is no doubt it is builtin-only. This code wasn't using module_init, so we don't need to be concerned with altering the initcall level here. We don't replace module.h with init.h since the file already has that. But we do add export.h since this file does export some symbols. We also delete the MODULE_LICENSE tag etc. since all that information is already contained at the top of the file in the comments. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2016-05-03PM / devfreq: event: Find the instance of devfreq-event device by using phandleChanwoo Choi
This patch use the phandle to find the instance of devfreq-event device in Device Tree when calling the devfreq_event_get_edev_by_phandle() because there is two type devfreq-event devices as following: First case, exynos-ppmu.c driver provides the maximum four event of each PPMU. So, when getting the instance of devfreq-event device, using the unique name of struct devfreq_event_desc. Second case, exynos-nocp.c driver provide the only one event of each NoC Probe device. So, when getting the instance of devfreq-event device, using the phandle of each NoC probe device. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2016-01-13PM / devfreq: event: Fix the error and warning from script/checkpatch.plChanwoo Choi
This patch just fixes following error and warning by using scripts/checkpatch.pl. - Follwoing issue from checkpatch.pl: ERROR: space prohibited before that close parenthesis ')' + if (count < 0 ) { WARNING: line over 80 characters + ptr = devres_alloc(devm_devfreq_event_release, sizeof(*ptr), GFP_KERNEL); Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2016-01-13PM / devfreq: event: Remove the error log of devfreq_event_get_edev_by_phandle()Chanwoo Choi
This patch just removes the error log when devfreq_event_get_edev_by_phandle() fail to get the instance of devfreq-event device. It is related to sequence of the probe() of each driver. So, this error log might show the always during kernel booting. Each driver using this function can show the appropriate error log. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
2015-01-30PM / devfreq: event: Add devfreq_event classChanwoo Choi
This patch adds a new class in devfreq, devfreq_event, which provides raw data (e.g., memory bus utilization, GPU utilization) for devfreq governors. - devfreq_event device : Provides raw data for a governor of a devfreq device - devfreq device : Monitors device state and changes frequency/voltage of the device using the raw data from its devfreq_event device. A devfreq device dertermines performance states (normally the frequency and the voltage vlues) based on the results its designtated devfreq governor: e.g., ondemand, performance, powersave. In order to give such results required by a devfreq device, the devfreq governor requires data that indicates the performance requirement given to the devfreq device. The conventional (previous) implementatino of devfreq subsystem requires a devfreq device driver to implement its own mechanism to acquire performance requirement for its governor. However, there had been issues with such requirements: 1. Although performance requirement of such devices is usually acquired from common devices (PMU/PPMU), we do not have any abstract structure to represent them properly. 2. Such performance requirement devices (PMU/PPMU) are actual hardware pieces that may be represented by Device Tree directly while devfreq device itself is a virtual entity that are not considered to be represented by Device Tree according to Device Tree folks. In order to address such issues, a devferq_event device (represented by this patch) provides a template for device drivers representing performance monitoring unit, which gives the basic or raw data for preformance requirement, which in turn, is required by devfreq governors. The following description explains the feature of two kind of devfreq class: - devfreq class (existing) : devfreq consumer device use raw data from devfreq_event device for determining proper current system state and change voltage/frequency dynamically using various governors. - devfreq_event class (new) : Provide measured raw data to devfreq device for governor Cc: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [Commit message rewritten & conflict resolved by MyungJoo] Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>