linux-kernel - Re: [PATCH V10 5/8] clocksource: add C-SKY SMP timer

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Date:   Fri, 5 Oct 2018 15:48:58 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Guo Ren <ren_guo@...ky.com>, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com, robh+dt@...nel.org,
        mark.rutland@....com, anurup.m@...wei.com,
        Jonathan.Cameron@...wei.com, will.deacon@....com,
        zhangshaokun@...ilicon.com, jhogan@...nel.org,
        paul.burton@...s.com, peterz@...radead.org, arnd@...db.de
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH V10 5/8] clocksource: add C-SKY SMP timer

On 04/10/2018 19:22, Guo Ren wrote:
> This timer is used by SMP system and use mfcr/mtcr instruction
> to access the regs.
> 
> Changelog:
>  - Add rollback for timer_of_cleanup.
>  - Use request_percpu_irq separate from time_of.
>  - Remove #define CPUHP_AP_CSKY_TIMER_STARTING.
>  - Add CPUHP_AP_CSKY_TIMER_STARTING in cpuhotplug.h.
>  - Support csky mp timer alpha version.
>  - Just use low-counter with 32bit width as clocksource.
>  - Coding convention with upstream feed-back.
> 
> Signed-off-by: Guo Ren <ren_guo@...ky.com>
> ---
>  drivers/clocksource/Kconfig         |  10 +++
>  drivers/clocksource/Makefile        |   1 +
>  drivers/clocksource/timer-mp-csky.c | 173 ++++++++++++++++++++++++++++++++++++
>  include/linux/cpuhotplug.h          |   1 +
>  4 files changed, 185 insertions(+)
>  create mode 100644 drivers/clocksource/timer-mp-csky.c
> 
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index a11f4ba..826a2e8 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -620,4 +620,14 @@ config RISCV_TIMER
>  	  is accessed via both the SBI and the rdcycle instruction.  This is
>  	  required for all RISC-V systems.
>  
> +config CSKY_MP_TIMER
> +	bool "SMP Timer for the C-SKY platform"
> +	depends on CSKY
> +	select TIMER_OF
> +	help
> +	  Say yes here to enable C-SKY SMP timer driver used for C-SKY SMP
> +	  system.
> +	  csky,mptimer is not only used in SMP system, it also could be used
> +	  single core system. It's not a mmio reg and it use mtcr/mfcr instruction.


... COMPILE_TEST :)





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