[PATCH v3 00/11] ARM: davinci: modernize the timer support

Bartosz Golaszewski
2019-02-26T12:07:36Z

Hi Sekhar,

merge window will be later than expected so I'm sending this now rebased
on top of your v5.1/soc branch - that way you'll be able to pick it up
early in the next release cycle.

---

This series removes the legacy timer code from mach-davinci in favor of
a new clocksource driver it introduces.

Patch 1 adds a new clocksource driver for davinci.

Patch 2 enables the new driver for device-tree based systems.

Patch 3 adds a WARN_ON() to the machine code of all davinci boards
which is triggered if clk_get() for the timer clock fails. This is needed
as the new driver expects the clock to be functional and doesn't check it.

Patches 4-5 and 7-10 switch the board files to using the new
clocksource driver while patch 6 moves some necessary defines to
a different place since we'll be removing the file that contains them.

Patch 11 removes legacy timer code.

v1 -> v2:

- changed the license to GPL-only
- dropped regmap usage due to the additional code paths making the
code too slow
- minor code rearrangement
- fixed the da830 timer configuration
- correctly assign the timer halfs to clocksource and clockevent
- sqashed the commits adding WARN() when clk_get() fails
- used WARN_ON() and added a return when clk_get() fails to avoid
entering the timer driver without a valid clock
- request the register range before iomapping it
- simplified the configuration structure (dropped the additional cmp struct)

v2 -> v3:

- use readl/writel_relaxed() instead of __raw variants in the clocksource
driver
- request the memory region before remapping it
- add explanatory comments
- fixed licensing
- used pr_fmt macro
- correctly assign the clocksource name
- use DEFINE_RES_x macros when defining resources to avoid off-by-one
bugs in resource's size
- tweak the commit messages
- don't delete the comments describing the timer usage
- other minor improvements
- rebased on top of Sekhar's soc branch
- dropped patch fixing the clocksource interrupts in device tree (already
upstream)

Bartosz Golaszewski (11):
clocksource: davinci-timer: new driver
ARM: davinci: enable the clocksource driver for DT mode
ARM: davinci: WARN_ON() if clk_get() fails
ARM: davinci: da850: switch to using the clocksource driver
ARM: davinci: da830: switch to using the clocksource driver
ARM: davinci: move timer definitions to davinci.h
ARM: davinci: dm355: switch to using the clocksource driver
ARM: davinci: dm365: switch to using the clocksource driver
ARM: davinci: dm644x: switch to using the clocksource driver
ARM: davinci: dm646x: switch to using the clocksource driver
ARM: davinci: remove legacy timer support

arch/arm/Kconfig | 1 +
arch/arm/mach-davinci/Makefile | 3 +-
arch/arm/mach-davinci/da830.c | 40 +-
arch/arm/mach-davinci/da850.c | 45 +-
arch/arm/mach-davinci/davinci.h | 3 +
arch/arm/mach-davinci/devices-da8xx.c | 1 -
arch/arm/mach-davinci/devices.c | 19 -
arch/arm/mach-davinci/dm355.c | 22 +-
arch/arm/mach-davinci/dm365.c | 22 +-
arch/arm/mach-davinci/dm644x.c | 28 +-
arch/arm/mach-davinci/dm646x.c | 28 +-
arch/arm/mach-davinci/include/mach/common.h | 17 -
arch/arm/mach-davinci/include/mach/time.h | 35 --
arch/arm/mach-davinci/time.c | 414 ------------------
drivers/clocksource/Kconfig | 5 +
drivers/clocksource/Makefile | 1 +
drivers/clocksource/timer-davinci.c | 438 ++++++++++++++++++++
include/clocksource/timer-davinci.h | 44 ++
18 files changed, 584 insertions(+), 582 deletions(-)
delete mode 100644 arch/arm/mach-davinci/include/mach/time.h
delete mode 100644 arch/arm/mach-davinci/time.c
create mode 100644 drivers/clocksource/timer-davinci.c
create mode 100644 include/clocksource/timer-davinci.h

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2.20.1