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SubjectRe: [PATCH V10 5/8] clocksource: add C-SKY SMP timer
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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@c-sky.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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