Messages in this thread | | | From | Alexandre Belloni <> | Subject | [PATCH v2 0/9] clocksource: improve Atmel TCB timer driver | Date | Mon, 15 Apr 2019 17:08:47 +0200 |
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Hi,
This series immproves the Atmel TCB clocksource driver to address the most urgent shortcomings: - the current tcb_clksrc driver is probed too late to be able to be used at boot and we now have SoCs that don't have a PIT. They currently are not able to boot an upstream kernel. - using the PIT doesn't work well with preempt-rt because its interrupt is shared (in particular with the UART) and their interrupt flags are incompatible). This also happen with the threadedirq command line switch. - there is currently no high resolution sched_clock.
The plan is to get those changes upstream as soon as possible as they are fixing real issues that people are facing. There are further changes needed on the clocksource driver to try to stop wasting a TCB channel. The PWM TCB driver will also be changed to actually use the reviewed binding and this will allow to get rid of atmel_tclib.
Changes in v2: - collected acks from Thierry and Arnd - dropped most of the atmel_tclib changes that coud be separated. - added a patch from kbuild - dropped the patch removing the PIT from the defconfig - moved the atmel_tcb.h inclusion in drivers/pwm/pwm-atmel-tcb.c as requested by Thierry - stopped using atmel_tcb_config - reworked the irq number parsing to only care for channel 2
Alexandre Belloni (8): ARM: at91: move SoC specific definitions to SoC folder clocksource/drivers/tcb_clksrc: stop depending on atmel_tclib clocksource/drivers/tcb_clksrc: Use tcb as sched_clock ARM: at91: Implement clocksource selection clocksource/drivers/tcb_clksrc: move Kconfig option clocksource/drivers/timer-atmel-pit: rework Kconfig option clocksource/drivers/tcb_clksrc: Rename the file for consistency misc: atmel_tclib: do not probe already used TCBs
kbuild test robot (1): clocksource/drivers/timer-atmel-tcb: tc_clksrc_suspend() can be static
arch/arm/mach-at91/Kconfig | 23 ++++ drivers/clocksource/Kconfig | 12 +- drivers/clocksource/Makefile | 2 +- .../{tcb_clksrc.c => timer-atmel-tcb.c} | 130 ++++++++++++------ drivers/misc/Kconfig | 24 ---- drivers/misc/atmel_tclib.c | 5 +- drivers/pwm/pwm-atmel-tcb.c | 2 +- .../atmel_tc.h => soc/at91/atmel_tcb.h} | 4 +- 8 files changed, 129 insertions(+), 73 deletions(-) rename drivers/clocksource/{tcb_clksrc.c => timer-atmel-tcb.c} (79%) rename include/{linux/atmel_tc.h => soc/at91/atmel_tcb.h} (99%)
-- 2.20.1
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