linux-kernel - [RFC v3 0/2] clocksource: davinci-timer: new driver

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Date:   Wed,  5 Jun 2019 10:33:32 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Lechner <david@...hnology.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [RFC v3 0/2] clocksource: davinci-timer: new driver

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

This is another version of the new davinci clocksource driver. After much
discussion this contains many changes to simplify and improve the driver.

v1 -> v2:
- changed the format of the copyright notice
- removed all mentiones of the periodic timer setting
- added caching of the TCR register value so that its updating doesn't
  require a read
- split the timer configuration for clock events into the
  set_state_oneshot() and set_state_shutdown() callbacks

v2 -> v3:
- tim34, if used, should run in periodic mode for clocksource, now fixed
- dropped all the configuration variables from struct davinci_clockevent
  as clockevent always uses tim12
- dropped caching of the TCR register with the following reasoning: on
  systems using tim34 for clocksource, the TCR register is only touched
  by the clock driver and we know that we need to keep tim34 in periodic
  mode; on da830 the RTOS running on the DSP may modify the TCR register
  but we on the other hand never change its settings when only using tim12
- subsequently the whole routine for TCR updating was dropped
- dropped the shift variable from most places
- added separate routines for initializing clocksource for da830 and all
  other systems
- sprinkled a bunch of comments all over the driver to explain things
  that caused confusion before

Bartosz Golaszewski (2):
  clocksource: davinci-timer: add support for clockevents
  clocksource: timer-davinci: add support for clocksource

 drivers/clocksource/Kconfig         |   5 +
 drivers/clocksource/Makefile        |   1 +
 drivers/clocksource/timer-davinci.c | 370 ++++++++++++++++++++++++++++
 include/clocksource/timer-davinci.h |  44 ++++
 4 files changed, 420 insertions(+)
 create mode 100644 drivers/clocksource/timer-davinci.c
 create mode 100644 include/clocksource/timer-davinci.h

-- 
2.21.0