[PATCH 00/12] clocksource: improve Atmel TCB timer driver

From: Alexandre Belloni
Date: Wed Apr 03 2019 - 10:11:41 EST


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
- there is currently no high resolution sched_clock.

The plan is to get those changes upstream as soon as possible as they
arre fixing real issues that people are facing. There are further
changes needed on the clocksource driver to try to stop wasting a TCB
the PWM TCB driver will also be changed to actually used the reviewed
binding and this will allow to get rif of atmel_tclib.

Alexandre Belloni (12):
ARM: at91: move SoC specific definitions to SoC folder
misc: atmel_tclib: drop AVR32 support
misc: atmel_tclib: move definitions to header file
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
ARM: configs: at91: unselect PIT
misc: atmel_tclib: do not probe already used TCBs
clocksource/drivers/timer-atmel-tcb: Use ARRAY_SIZE instead of
hardcoded size

arch/arm/configs/at91_dt_defconfig | 1 +
arch/arm/configs/sama5_defconfig | 1 +
arch/arm/mach-at91/Kconfig | 23 ++++
drivers/clocksource/Kconfig | 12 +-
drivers/clocksource/Makefile | 2 +-
.../{tcb_clksrc.c => timer-atmel-tcb.c} | 123 ++++++++++++------
drivers/misc/Kconfig | 24 ----
drivers/misc/atmel_tclib.c | 37 +-----
drivers/pwm/pwm-atmel-tcb.c | 2 +-
.../atmel_tc.h => soc/at91/atmel_tcb.h} | 25 +++-
10 files changed, 146 insertions(+), 104 deletions(-)
rename drivers/clocksource/{tcb_clksrc.c => timer-atmel-tcb.c} (81%)
rename include/{linux/atmel_tc.h => soc/at91/atmel_tcb.h} (95%)