Merge tag 'devfreq-next-for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux

Pull devfreq updates for v5.6 from Chanwoo Choi:

"1. Update devfreq core

 - Add new 'name' attribute of sysfs to show the device name
   : /sys/class/devfreq/devfreqX/name

 - Make 'trans_stat' sysfs reset by entering zero(0)
   : echo 0 > /sys/class/devfreq/devfreqX/trans_stat

 - Add debugfs support with 'devfreq_summary' to show the summary
   : /sys/kernel/debug/devfreq/devfreq_summary

 - Change the type of time variable to 64bit to avoid overflows.

 - Make separate devfreq_stats including the statistics information.

 - Fix minor coding-style like indentation and kernel-doc warnings.

 2. Update devfreq drivers

 - Add new imx8m-ddrc.c devfreq driver for dynamic scaling of DDR frequency.
   It changes the DDR frequency by using ARM SMCCC(SMC Calling Convention)
   interface to control TF-A firmware.

 - Add COMPILE_TEST dependency for rk3399_dmc.c.

 - Clean-up code for exynos-bus.c and rk3399_dmc.c without behavior changes

 3. Update devfreq-event drivers

 - Fix excessive stack usage of exynos-ppmu.c and clean-up code of
   rockchip-dfi.c without behavior changes."

* tag 'devfreq-next-for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux: (24 commits)
  PM / devfreq: Add debugfs support with devfreq_summary file
  PM / devfreq: exynos: Rename Exynos to lowercase
  PM / devfreq: imx8m-ddrc: Fix inconsistent IS_ERR and PTR_ERR
  PM / devfreq: exynos-bus: Add error log when fail to get devfreq-event
  PM / devfreq: exynos-bus: Disable devfreq-event device when fails
  PM / devfreq: rk3399_dmc: Disable devfreq-event device when fails
  PM / devfreq: imx8m-ddrc: Remove unused defines
  PM / devfreq: exynos-bus: Reduce goto statements and remove unused headers
  PM / devfreq: rk3399_dmc: Add COMPILE_TEST and HAVE_ARM_SMCCC dependency
  PM / devfreq: rockchip-dfi: Convert to devm_platform_ioremap_resource
  PM / devfreq: rk3399_dmc: Add missing of_node_put()
  PM / devfreq: rockchip-dfi: Add missing of_node_put()
  PM / devfreq: Fix multiple kernel-doc warnings
  PM / devfreq: exynos-bus: Extract exynos_bus_profile_init_passive()
  PM / devfreq: exynos-bus: Extract exynos_bus_profile_init()
  PM / devfreq: Move declaration of DEVICE_ATTR_RW(min_freq)
  PM / devfreq: Move statistics to separate struct devfreq_stats
  PM / devfreq: Add clearing transitions stats
  PM / devfreq: Change time stats to 64-bit
  PM / devfreq: Add new name attribute for sysfs
  ...

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