linux-kernel - Re: [PATCH v3 0/9] clocksource: improve Atmel TCB timer driver

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Date:   Sun, 28 Apr 2019 11:54:23 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexander Dahl <ada@...rsis.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Romain Izard <romain.izard.pro@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/9] clocksource: improve Atmel TCB timer driver


Applied, thanks.

  -- Daniel


On 26/04/2019 23:47, Alexandre Belloni wrote:
> 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 v3:
>  - collected ack from GKH
>  - return -EBUSY instead of 0 when the TCB is already used
> 
> 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%)
> 


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