linux-kernel - [PATCH v2 00/12] ARM: davinci: modernize the timer support

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Date:   Mon,  4 Feb 2019 18:17:45 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v2 00/12] ARM: davinci: modernize the timer support

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

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

The first patch fixes a device tree bug that's been around for a while.
Unfortunately any systems shipped with the buggy device will stop booting
once they switch to the new clocksource driver.

Patch 2 adds a new clocksource driver for davinci.

Patch 3 enables the new driver for device-tree based systems.

Patch 4 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 5-6 and 8-11 switch the board files to using the new
clocksource driver while patch 7 moves some necessary defines to
a different place since we'll be removing the file that contains them.

Patch 12 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)

Bartosz Golaszewski (12):
  ARM: dts: da850: fix interrupt numbers for clocksource
  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/boot/dts/da850.dtsi                |   2 +-
 arch/arm/mach-davinci/Makefile              |   3 +-
 arch/arm/mach-davinci/da830.c               |  53 ++-
 arch/arm/mach-davinci/da850.c               |  60 ++-
 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               |  40 +-
 arch/arm/mach-davinci/dm365.c               |  34 +-
 arch/arm/mach-davinci/dm644x.c              |  40 +-
 arch/arm/mach-davinci/dm646x.c              |  40 +-
 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         | 431 ++++++++++++++++++++
 include/clocksource/timer-davinci.h         |  44 ++
 19 files changed, 647 insertions(+), 596 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

-- 
2.20.1