Merge tag 'devfreq-next-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux

Pull devfreq updates for v5.9 from Chanwoo Choi:

1. Update devfreq core

 - Add delayed timer support for polling mode. Until now, devfreq supported
   only deferrable timer to avoid unneeded CPU wakeups. However, it has a
   problem for non-CPU devices, like DMC, doing DMA. Such devices need to
   monitor continuously regardless of the CPU state, so delayed timer support
   for the polling mode to facilitate the continuous monitoring.

 - Fix indentation of result of devfreq_summary debugfs node.

 - Fix the wrong end of code with a semicolon instead of a comma.

 - Clean-up code to use a unified local variable name in sysfs-related
   internal funcitons.

 - Fix trivial spelling mistake in devfreq-event.c.

2. Update devfreq drivers

 - Add the exception handling code to control when rockchip,pmu property is
   absent for rk3399_dmc.c.

 - Add missing 'rockchip,pmu' property to dt-binding document for rk3399_dmc.c.

 - Change the type of timer in exynos5422-dmc.c from deferrable to delayed
   in order to monitor the DMC (Dynamic Memory Controller) status regardless of
   the CPU idle state. Also adjust the polling interval and upthreshold
   value in order to react faster and make better decisions when benchmarking
   testing for the memory behavior.

 - Add module parameter to either enable or disable the IRQ mode for DMC
   behavior monitoring. exynos5422-dmc.c can operate in both the polling and
   the IRQ mode. The user can choose the monitoring mode via a module param.
   The default monitoring mode is the polling mode with a delayed timer.

 3. Add maintainer entry

 - Add Dmitry Osipenko <[email protected]> as maintainer for memory
   frequency scaling drivers for Nvidia Tegra. He has developed and
   reviewed tegra*-devfreq.c.

* tag 'devfreq-next-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux:
  PM / devfreq: Fix the wrong end with semicolon
  PM / devfreq: Fix indentaion of devfreq_summary debugfs node
  PM / devfreq: Clean up the devfreq instance name in sysfs attr
  memory: samsung: exynos5422-dmc: Add module param to control IRQ mode
  memory: samsung: exynos5422-dmc: Adjust polling interval and uptreshold
  memory: samsung: exynos5422-dmc: Use delayed timer as default
  PM / devfreq: Add support delayed timer for polling mode
  dt-bindings: devfreq: rk3399_dmc: Add rockchip,pmu phandle
  PM / devfreq: tegra: Add Dmitry as a maintainer
  PM / devfreq: event: Fix trivial spelling
  PM / devfreq: rk3399_dmc: Fix kernel oops when rockchip,pmu is absent

Author: rafaeljw

Documentation/ABI/testing/sysfs-class-devfreq

@@ -108,3 +108,15 @@ Description:
 		frequency requested by governors and min_freq.
 		The max_freq overrides min_freq because max_freq may be
 		used to throttle devices to avoid overheating.
+
+What:		/sys/class/devfreq/.../timer
+Date:		July 2020
+Contact:	Chanwoo Choi <[email protected]>
+Description:
+		This ABI shows and stores the kind of work timer by users.
+		This work timer is used by devfreq workqueue in order to
+		monitor the device status such as utilization. The user
+		can change the work timer on runtime according to their demand
+		as following:
+			echo deferrable > /sys/class/devfreq/.../timer
+			echo delayed > /sys/class/devfreq/.../timer

Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt

@@ -18,6 +18,8 @@ Optional properties:
 			 format depends on the interrupt controller.
 			 It should be a DCF interrupt. When DDR DVFS finishes
 			 a DCF interrupt is triggered.
+- rockchip,pmu:		 Phandle to the syscon managing the "PMU general register
+			 files".
 
 Following properties relate to DDR timing:
 

MAINTAINERS

@@ -11097,6 +11097,15 @@ F:	Documentation/core-api/boot-time-mm.rst
 F:	include/linux/memblock.h
 F:	mm/memblock.c
 
+MEMORY FREQUENCY SCALING DRIVERS FOR NVIDIA TEGRA
+M:	Dmitry Osipenko <[email protected]>
+L:	[email protected]
+L:	[email protected]
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git
+S:	Maintained
+F:	drivers/devfreq/tegra20-devfreq.c
+F:	drivers/devfreq/tegra30-devfreq.c
+
 MEMORY MANAGEMENT
 M:	Andrew Morton <[email protected]>
 L:	[email protected]

drivers/devfreq/devfreq-event.c

@@ -293,7 +293,7 @@ static void devfreq_event_release_edev(struct device *dev)
 /**
  * devfreq_event_add_edev() - Add new devfreq-event device.
  * @dev		: the device owning the devfreq-event device being created
- * @desc	: the devfreq-event device's decriptor which include essential
+ * @desc	: the devfreq-event device's descriptor which include essential
  *		  data for devfreq-event device.
  *
  * Note that this function add new devfreq-event device to devfreq-event class
@@ -385,7 +385,7 @@ static void devm_devfreq_event_release(struct device *dev, void *res)
 /**
  * devm_devfreq_event_add_edev() - Resource-managed devfreq_event_add_edev()
  * @dev		: the device owning the devfreq-event device being created
- * @desc	: the devfreq-event device's decriptor which include essential
+ * @desc	: the devfreq-event device's descriptor which include essential
  *		  data for devfreq-event device.
  *
  * Note that this function manages automatically the memory of devfreq-event