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Subject[PATCH v4 0/6] clocksource: rework Atmel TCB timer driver

This series gets back on the TCB drivers rework. It introduces a new driver to
handle the clocksource and clockevent devices.

As a reminder, this is necessary because:
- 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 a mainline 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
- the current solution is wasting some TCB channels

The plan is to get this driver upstream, then convert the TCB PWM driver to be
able to get rid of the tcb_clksrc driver along with atmel_tclib.

Changes in v4:
- rebased on top of v4.17-rc1
- fixed an issue when setting max_delta for clockevents_config_and_register

Alexandre Belloni (6):
ARM: at91: add TCB registers definitions
clocksource/drivers: Add a new driver for the Atmel ARM TC blocks
clocksource/drivers: atmel-pit: make option silent
ARM: at91: Implement clocksource selection
ARM: configs: at91: use new TCB timer driver
ARM: configs: at91: unselect PIT

arch/arm/configs/at91_dt_defconfig | 2 +-
arch/arm/configs/sama5_defconfig | 2 +-
arch/arm/mach-at91/Kconfig | 25 ++
drivers/clocksource/Kconfig | 13 +-
drivers/clocksource/Makefile | 3 +-
drivers/clocksource/timer-atmel-tcb.c | 608 ++++++++++++++++++++++++++
include/soc/at91/atmel_tcb.h | 216 +++++++++
7 files changed, 865 insertions(+), 4 deletions(-)
create mode 100644 drivers/clocksource/timer-atmel-tcb.c
create mode 100644 include/soc/at91/atmel_tcb.h


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