From: alexandre.belloni@bootlin•com (Alexandre Belloni)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v3 0/6] clocksource: rework Atmel TCB timer driver
Date: Thu, 22 Mar 2018 16:33:47 +0100 [thread overview]
Message-ID: <20180322153347.GX3417@piout.net> (raw)
In-Reply-To: <20180223171558.7037-1-alexandre.belloni@bootlin.com>
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
next prev parent reply other threads:[~2018-03-22 15:33 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-23 17:15 [PATCH v3 0/6] clocksource: rework Atmel TCB timer driver Alexandre Belloni
2018-02-23 17:15 ` [PATCH v3 1/6] ARM: at91: add TCB registers definitions Alexandre Belloni
2018-02-23 17:15 ` [PATCH v3 2/6] clocksource/drivers: Add a new driver for the Atmel ARM TC blocks Alexandre Belloni
2018-02-23 17:15 ` [PATCH v3 3/6] clocksource/drivers: atmel-pit: make option silent Alexandre Belloni
2018-02-23 17:15 ` [PATCH v3 4/6] ARM: at91: Implement clocksource selection Alexandre Belloni
2018-02-23 17:15 ` [PATCH v3 5/6] ARM: configs: at91: use new TCB timer driver Alexandre Belloni
2018-02-23 17:15 ` [PATCH v3 6/6] ARM: configs: at91: unselect PIT Alexandre Belloni
2018-03-22 15:33 ` Alexandre Belloni [this message]
2018-03-27 10:41 ` [PATCH v3 0/6] clocksource: rework Atmel TCB timer driver Alexander Dahl
2018-03-27 11:30 ` Daniel Lezcano
2018-03-28 10:29 ` Alexander Dahl
2018-03-28 13:03 ` Daniel Lezcano
2018-03-28 14:16 ` Alexandre Belloni
2018-03-28 14:36 ` Daniel Lezcano
2018-03-28 15:31 ` Alexandre Belloni
2018-03-28 15:50 ` Alexandre Belloni
2018-03-29 8:01 ` Alexander Dahl
2018-03-29 10:45 ` Alexandre Belloni
2018-03-29 11:31 ` Alexander Dahl
2018-03-29 11:42 ` Alexandre Belloni
2018-03-29 12:07 ` Daniel Lezcano
2018-03-29 13:02 ` Alexandre Belloni
2018-03-29 15:11 ` Alexander Dahl
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