linux-toradex.git/drivers/clocksource/samsung_pwm_timer.c, branch v4.4.56

clocksource/drivers/samsung_pwm_timer: Prevent ftrace recursion

2015-10-27T00:33:41+00:00

Currently samsung_pwm_timer can be used as a scheduler clock. We properly
marked samsung_read_sched_clock() as notrace but we then call another
function samsung_clocksource_read() that _wasn't_ notrace.

Having a traceable function in the sched_clock() path leads to a recursion
within ftrace and a kernel crash.

Fix this by adding notrace attribute to the samsung_clocksource_read()
function.

Signed-off-by: Jisheng Zhang 
Signed-off-by: Daniel Lezcano

clockevents/drivers/samsung_pwm: Migrate to new 'set-state' interface

2015-08-10T09:40:37+00:00

Migrate samsung_pwm driver to the new 'set-state' interface provided by
clockevents core, the earlier 'set-mode' interface is marked obsolete
now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

Cc: Tomasz Figa 
Cc: Kukjin Kim 
Signed-off-by: Viresh Kumar 
Signed-off-by: Daniel Lezcano

clocksource: misc drivers: Remove deprecated IRQF_DISABLED

2013-12-11T10:40:27+00:00

This patch removes the use of the IRQF_DISABLED flag

It's a NOOP since 2.6.35 and it will be removed one day.

[dlezcano] : slightly changed the changelog

Signed-off-by: Michael Opdenacker 
Signed-off-by: Daniel Lezcano

Merge remote-tracking branch 'tip/timers/core' into fordlezcano/3.13/sched-clock64-conversion

2013-09-26T19:05:54+00:00

Update to tip/timers/core and resolve minor conflict.

Conflicts:
	drivers/clocksource/samsung_pwm_timer.c

Signed-off-by: John Stultz

Merge tag 'clk-for-linus-3.12' of git://git.linaro.org/people/mturquette/linux

2013-09-09T22:49:04+00:00

Pull clock framework changes from Michael Turquette:
 "The common clk framework changes for 3.12 are dominated by clock
  driver patches, both new drivers and fixes to existing.  A high
  percentage of these are for Samsung platforms like Exynos.  Core
  framework fixes and some new features like automagical clock
  re-parenting round out the patches"

* tag 'clk-for-linus-3.12' of git://git.linaro.org/people/mturquette/linux: (102 commits)
  clk: only call get_parent if there is one
  clk: samsung: exynos5250: Simplify registration of PLL rate tables
  clk: samsung: exynos4: Register PLL rate tables for Exynos4x12
  clk: samsung: exynos4: Register PLL rate tables for Exynos4210
  clk: samsung: exynos4: Reorder registration of mout_vpllsrc
  clk: samsung: pll: Add support for rate configuration of PLL46xx
  clk: samsung: pll: Use new registration method for PLL46xx
  clk: samsung: pll: Add support for rate configuration of PLL45xx
  clk: samsung: pll: Use new registration method for PLL45xx
  clk: samsung: exynos4: Rename exynos4_plls to exynos4x12_plls
  clk: samsung: exynos4: Remove checks for DT node
  clk: samsung: exynos4: Remove unused static clkdev aliases
  clk: samsung: Modify _get_rate() helper to use __clk_lookup()
  clk: samsung: exynos4: Use separate aliases for cpufreq related clocks
  clocksource: samsung_pwm_timer: Get clock from device tree
  ARM: dts: exynos4: Specify PWM clocks in PWM node
  pwm: samsung: Update DT bindings documentation to cover clocks
  clk: Move symbol export to proper location
  clk: fix new_parent dereference before null check
  clk: wm831x: Initialise wm831x pointer on init
  ...

clocksource: samsung_pwm_timer: Get clock from device tree

2013-09-06T20:33:05+00:00

When booting with device tree static clkdev aliases should not be used.
This patch modifies the samsung_pwm_timer driver to use DT-based clock
lookup when booting with device tree.

Signed-off-by: Tomasz Figa 
Signed-off-by: Kyungmin Park 
Reviewed-by: Sylwester Nawrocki 
Signed-off-by: Mike Turquette

clocksource: samsung_pwm_timer: Handle suspend/resume correctly

2013-08-05T23:21:43+00:00

Current suspend/resume handling of the driver was broken, because:
 - periodic timer was being enabled in CLOCK_EVT_MODE_RESUME mode, which
   does not seem to be correct behavior looking at other platforms,
 - PWM divisors need to be restored, but they were not,
 - clockevent interrupt mask needs to be restored, but it was not,
 - clocksource was being restored in clockevent resume callback.

This patch fixes issues mentioned above, making suspend/resume handling
in the driver correct.

Signed-off-by: Tomasz Figa 
Reviewed-by: Sylwester Nawrocki 
Tested-by: Heiko Stuebner 
Tested-by: Mark Brown 
Tested-by: Sylwester Nawrocki 
Acked-by: Arnd Bergmann 
Acked-by: Daniel Lezcano

clocksource: samsung_pwm_timer: Do not use clocksource_mmio

2013-08-05T23:21:43+00:00

In case of Samsung PWM timer, clocksource MMIO can not be used, because
custom suspend/resume callbacks are required.

Signed-off-by: Tomasz Figa 
Reviewed-by: Daniel Lezcano 
Reviewed-by: Sylwester Nawrocki 
Tested-by: Heiko Stuebner 
Tested-by: Mark Brown 
Tested-by: Sylwester Nawrocki 
Acked-by: Arnd Bergmann

clocksource: samsung_pwm_timer: Cache clocksource register address

2013-08-05T23:21:42+00:00

Instead of calculating register every time the timer should be read,
we can just do it one time at initialization and store the address in
driver data.

Signed-off-by: Tomasz Figa 
Reviewed-by: Sylwester Nawrocki 
Tested-by: Heiko Stuebner 
Tested-by: Mark Brown 
Tested-by: Sylwester Nawrocki 
Acked-by: Arnd Bergmann

clocksource: samsung_pwm_timer: Correct definition of AUTORELOAD bit

2013-08-05T23:21:41+00:00

PWM channel 4 has its autoreload bit located at different position. This
patch fixes the driver to account for that.

This fixes a problem with the clocksource hanging after it overflows because
it is not reloaded any more.

Signed-off-by: Tomasz Figa 
Reviewed-by: Sylwester Nawrocki 
Tested-by: Heiko Stuebner 
Tested-by: Mark Brown 
Tested-by: Sylwester Nawrocki 
Acked-by: Arnd Bergmann