summaryrefslogtreecommitdiff
path: root/Documentation/ABI/testing/sysfs-class-devfreq
diff options
context:
space:
mode:
authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-12-11 21:40:00 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-12-11 21:40:00 +0300
commitd3569c149dfe05f1e6e322d4851eed42dbad3df6 (patch)
treee5a2fbd5bc7d08fc39975ba76984a3b2bfccdf62 /Documentation/ABI/testing/sysfs-class-devfreq
parent0477e92881850d44910a7e94fc2c46f96faa131f (diff)
parent6a575e84f11e15078629f0d16bff2bc354a6bfc0 (diff)
downloadlinux-d3569c149dfe05f1e6e322d4851eed42dbad3df6.tar.xz
Merge tag 'devfreq-next-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux
Pull devfreq updates for 5.11 from Chanwoo Choi: 1. Update devfreq core - Add new devfreq_frequency tracepoint to show the frequency change information. - Add governor feature flag. The devfreq governor is able to set the specific flag in order to support a non-common feature. For example, if the governor supports the 'immutable' feature, don't allow user space to change the governor via sysfs. - Add governor sysfs attribute flag for each sysfs file. Prior to that the devfreq subsystem allowed all of the sysfs files to be accessed regardless of the governor type. But some sysfs fils are not supported by specific devfreq governors. In order to only allow the sysfs files supported by the governor to be accessed, clarify the access permissions of sysfs attributes according to the governor. When adding the devfreq governor, specify the available attribute information by using DEVFREQ_GOV_ATTR_* symbols. The user can read or write the sysfs attributes in accordance to the specified access permissions. - Clean-up the code to reduce duplication for the devfreq tracepoint and to remove redundant governor_name field from struct devfreq. 2. Update exynos-bus.c devfreq driver - Add interconnect API support to the Samsung Exynos Bus Frequency driver, exynos-bus.c. Complementing the devfreq driver with interconnect functionality allows to ensure that the QoS requirements regarding devices accessing the system memory (e.g. video processing devices) will be met and allows to avoid issues like DMA underrun. 3. Update tegra devfreq driver - Add interconnect support and OPP interface to tegra30-devfreq.c. Also, it is to guarantee the QoS requirement of some devices like the display controller. - Move tegra20-devfreq.c from drivers/devfreq/ into drivers/memory/tegra/ in order to use the more proper monitoring feature such as EMC_STAT which is located in drivers/memory/tegra/. - Separate the configuration information for different SoCs in tegra30-devfrqe.c. The tegra30-devfreq.c had been supporting both tegra30-actmon and tegra124-actmon devices. In order to use the more correct configuration data, separate them. - Use dev_err_probe() to handle the deferred probe error in tegra30-devfreq.c. 4. Pull the request of 'Tegra SoC and clock controller changes for v5.11' sent by Krzysztof Kozlowski <krzk@kernel.org> in order to avoid a build error." * tag 'devfreq-next-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux: PM / devfreq: tegra30: Separate configurations per-SoC generation PM / devfreq: tegra30: Support interconnect and OPPs from device-tree PM / devfreq: tegra20: Deprecate in a favor of emc-stat based driver PM / devfreq: exynos-bus: Add registration of interconnect child device dt-bindings: devfreq: Add documentation for the interconnect properties soc/tegra: fuse: Add stub for tegra_sku_info soc/tegra: fuse: Export tegra_read_ram_code() clk: tegra: Export Tegra20 EMC kernel symbols PM / devfreq: tegra30: Silence deferred probe error PM / devfreq: tegra20: Relax Kconfig dependency PM / devfreq: tegra20: Silence deferred probe error PM / devfreq: Remove redundant governor_name from struct devfreq PM / devfreq: Add governor attribute flag for specifc sysfs nodes PM / devfreq: Add governor feature flag PM / devfreq: Add tracepoint for frequency changes PM / devfreq: Unify frequency change to devfreq_update_target func trace: events: devfreq: Use fixed indentation size to improve readability
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-devfreq')
-rw-r--r--Documentation/ABI/testing/sysfs-class-devfreq54
1 files changed, 32 insertions, 22 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-devfreq b/Documentation/ABI/testing/sysfs-class-devfreq
index b8ebff4b1c4c..386bc230a33d 100644
--- a/Documentation/ABI/testing/sysfs-class-devfreq
+++ b/Documentation/ABI/testing/sysfs-class-devfreq
@@ -37,20 +37,6 @@ Description:
The /sys/class/devfreq/.../target_freq shows the next governor
predicted target frequency of the corresponding devfreq object.
-What: /sys/class/devfreq/.../polling_interval
-Date: September 2011
-Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
-Description:
- The /sys/class/devfreq/.../polling_interval shows and sets
- the requested polling interval of the corresponding devfreq
- object. The values are represented in ms. If the value is
- less than 1 jiffy, it is considered to be 0, which means
- no polling. This value is meaningless if the governor is
- not polling; thus. If the governor is not using
- devfreq-provided central polling
- (/sys/class/devfreq/.../central_polling is 0), this value
- may be useless.
-
What: /sys/class/devfreq/.../trans_stat
Date: October 2012
Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
@@ -66,14 +52,6 @@ Description:
echo 0 > /sys/class/devfreq/.../trans_stat
-What: /sys/class/devfreq/.../userspace/set_freq
-Date: September 2011
-Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
-Description:
- The /sys/class/devfreq/.../userspace/set_freq shows and
- sets the requested frequency for the devfreq object if
- userspace governor is in effect.
-
What: /sys/class/devfreq/.../available_frequencies
Date: October 2012
Contact: Nishanth Menon <nm@ti.com>
@@ -110,6 +88,35 @@ Description:
The max_freq overrides min_freq because max_freq may be
used to throttle devices to avoid overheating.
+What: /sys/class/devfreq/.../polling_interval
+Date: September 2011
+Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
+Description:
+ The /sys/class/devfreq/.../polling_interval shows and sets
+ the requested polling interval of the corresponding devfreq
+ object. The values are represented in ms. If the value is
+ less than 1 jiffy, it is considered to be 0, which means
+ no polling. This value is meaningless if the governor is
+ not polling; thus. If the governor is not using
+ devfreq-provided central polling
+ (/sys/class/devfreq/.../central_polling is 0), this value
+ may be useless.
+
+ A list of governors that support the node:
+ - simple_ondmenad
+ - tegra_actmon
+
+What: /sys/class/devfreq/.../userspace/set_freq
+Date: September 2011
+Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
+Description:
+ The /sys/class/devfreq/.../userspace/set_freq shows and
+ sets the requested frequency for the devfreq object if
+ userspace governor is in effect.
+
+ A list of governors that support the node:
+ - userspace
+
What: /sys/class/devfreq/.../timer
Date: July 2020
Contact: Chanwoo Choi <cw00.choi@samsung.com>
@@ -122,3 +129,6 @@ Description:
echo deferrable > /sys/class/devfreq/.../timer
echo delayed > /sys/class/devfreq/.../timer
+
+ A list of governors that support the node:
+ - simple_ondemand