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Date: Tue, 20 Oct 2020 12:04:05 +0900 From: Chanwoo Choi <cw00.choi@...sung.com> To: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org Cc: digetx@...il.com, lukasz.luba@....com, enric.balletbo@...labora.com, hl@...k-chips.com, thierry.reding@...il.com, jonathanh@...dia.com, abel.vesa@....com, k.konieczny@...sung.com, b.zolnierkie@...sung.com, cw00.choi@...sung.com, chanwoo@...nel.org, myungjoo.ham@...sung.com, kyungmin.park@...sung.com Subject: [PATCH v4 0/2] PM / devfreq: Add governor feature and attribute flag Each devfreq governor can have the different sysfs attributes and features. In order to provide the only available sysfs attribute to user-space, add governor attribute flag with DEVFREQ_GOV_ATTR_[attribute name] defintion. Also, each governor is able to have the specific flag in order to support specific feature with DEVFREQ_GOV_FLAG_[feature name] defintion like immutable governor. According to each governor, can initiate the governor feature and attribute flags. [Common sysfs attributes for devfreq class] And all devfreq governors have to support the following common attributes. The common attributes are added to devfreq class by default. - governor - available_governors - available_frequencies - cur_freq - target_freq - min_freq - max_freq - trans_stat [Definition for governor attribute flag] - DEVFREQ_GOV_ATTR_POLLING_INTERVAL to update polling interval for timer. : /sys/class/devfreq/[devfreq dev name]/polling_interval - DEVFREQ_GOV_ATTR_TIMER to change the type of timer on either deferrable or dealyed timer. : /sys/class/devfreq/[devfreq dev name]/timer [Definition for governor feature flag] - DEVFREQ_GOV_FLAG_IMMUTABLE : If immutable flag is set, governor is never changeable to other governors. - DEVFREQ_GOV_FLAG_IRQ_DRIVEN : Devfreq core won't schedule polling work for this governor if value is set. [Table of governor attribute flags for evfreq governors] ----------------------------------------------------------------------------- | simple | perfor | power | user | passive | tegra30 | ondemand | mance | save | space| | ------------------------------------------------------------------------------ governor | O | O | O | O | O | O available_governors | O | O | O | O | O | O available_frequencies | O | O | O | O | O | O cur_freq | O | O | O | O | O | O target_freq | O | O | O | O | O | O min_freq | O | O | O | O | O | O max_freq | O | O | O | O | O | O trans_stat | O | O | O | O | O | O ------------------------------------------------------------------------------ polling_interval | O | X | X | X | X | O timer | O | X | X | X | X | X ------------------------------------------------------------------------------ immutable | X | X | X | X | O | O interrupt_driven | X(polling)| X | X | X | X | O (irq) ------------------------------------------------------------------------------ Changes from v3: - Fix typo - Rename from 'flag' to 'flags' - Add more exception handling code and add comments on governor_store() Changes from v2: - Hide unsupported sysfs node to user-space instead of checking the permission of sysfs node. Chanwoo Choi (2): PM / devfreq: Add governor feature flag PM / devfreq: Add governor attribute flag for specifc sysfs nodes Chanwoo Choi (2): PM / devfreq: Add governor feature flag PM / devfreq: Add governor attribute flag for specifc sysfs nodes Documentation/ABI/testing/sysfs-class-devfreq | 54 +++-- drivers/devfreq/devfreq.c | 213 ++++++++++++------ drivers/devfreq/governor.h | 30 ++- drivers/devfreq/governor_passive.c | 2 +- drivers/devfreq/governor_simpleondemand.c | 2 + drivers/devfreq/tegra30-devfreq.c | 5 +- 6 files changed, 200 insertions(+), 106 deletions(-) -- 2.17.1
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