13 Aug, 2013
1 commit
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This patch introduces new Samsung PWM driver, which is completely
rewritten to be multiplatform- and DeviceTree-aware.In addition, remaining problems of old driver are fixed, such as:
- proper handling of hardware variants,
- synchronization on SMP systems,
- handling of boundary parameter values,
- hardware sharing with PWM clocksource driver,
- undefined state of PWM output after stopping PWM channel.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: Thierry Reding
29 Apr, 2013
3 commits
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This patch extends the driver to support platforms that still use legacy
ATAGS-based boot, without device tree, by providing an exported function
that can be used from platform code to initialize the clocksource.Signed-off-by: Tomasz Figa
Signed-off-by: Kyungmin Park
Reviewed-by: Arnd Bergmann
Acked-by: Kukjin Kim
Signed-off-by: Olof Johansson -
This patch removes the unused samsung_pwm struct from public header.
Signed-off-by: Tomasz Figa
Signed-off-by: Kyungmin Park
Reviewed-by: Arnd Bergmann
Acked-by: Kukjin Kim
Signed-off-by: Olof Johansson -
This patch makes the PWM spinlock global and exports it to allow using
it in Samsung PWM driver (will be reworked to use proper synchronization
in further patches).Signed-off-by: Tomasz Figa
Signed-off-by: Kyungmin Park
Reviewed-by: Arnd Bergmann
Acked-by: Kukjin Kim
Signed-off-by: Olof Johansson
21 Apr, 2013
1 commit
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This adds a new clocksource driver for the PWM timer that is
present in most Samsung SoCs, based on the existing driver in
arch/arm/plat-samsung/samsung-time.c and many changes implemented by
Tomasz Figa.Originally, the conversion of all Samsung machines to the new driver was
planned for 3.10, but that work ended up being too late and too invasive
just before the merge window.Unfortunately, other changes in the Exynos platform resulted in some
Exynos4 setups, particularly the Universal C210 board to be broken. In
order to fix that with minimum risk, so we now leave the existing pwm
clocksource driver in place for all older platforms and use the new
driver only for device tree enabled boards. This way, we can get the
broken machines running again using DT descriptions.All clocksource changes were implemented by Tomasz, while the DT
registration was rewritten by Arnd.Signed-off-by: Arnd Bergmann
Cc: Tomasz Figa
Cc: Kyungmin Park
Cc: Kukjin Kim
Cc: Ben Dooks
Cc: John Stultz
Cc: Thomas Gleixner