lkml.org 
[lkml]   [2018]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3 0/6] clocksource: rework Atmel TCB timer driver
Hi Daniel,

I'd really like to get this in the kernel soon as we have platform that
still can't boot with a mainline kernel because they don't have a PIT.

On 23/02/2018 at 18:15:52 +0100, Alexandre Belloni wrote:
> Hi,
>
> 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
> incompatible)
> - 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 v3:
> - use SPDX tag in include/soc/at91/atmel_tcb.h
> - rework option selection to make the clocksource option silent
>
> Main changes in v2:
> - use direct IO instead of regmap when accessing channel specific registers to
> avoid the regmap locking
> - implement suspend/resume
>
>
> 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
>
> --
> 2.16.1
>

--
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

\
 
 \ /
  Last update: 2018-03-22 16:34    [W:0.079 / U:2.216 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site