linux-kernel - Re: [PATCH v3 4/6] clocksource: exynos_mct: Add arch

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Date:   Thu, 18 Oct 2018 12:51:02 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Inki Dae <inki.dae@...sung.com>
Subject: Re: [PATCH v3 4/6] clocksource: exynos_mct: Add arch_timer
 cooperation mode for ARM64

Hi Marek,

On 2018년 10월 17일 22:41, Marek Szyprowski wrote:
> To get ARM Architected Timers working on Samsung Exynos SoCs, one has to
> first configure and enable Exynos Multi-Core Timer, because they both
> share some common hardware blocks (global system counter). This patch
> adds a mode of cooperation with arch_timer driver, so kernel can use
> CP15 based timer interface via arch_timer driver, which is mandatory
> on ARM64. In such mode MCT driver only enables its clocks and starts
> global timer. Everything else will be handled by arch_timer driver.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  drivers/clocksource/exynos_mct.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
> index 02ad55db390b..1b19a4f03929 100644
> --- a/drivers/clocksource/exynos_mct.c
> +++ b/drivers/clocksource/exynos_mct.c
> @@ -606,6 +606,15 @@ static int __init mct_init_dt(struct device_node *np, unsigned int int_type)
>  	if (ret)
>  		return ret;
>  
> +	if (IS_ENABLED(CONFIG_ARM64) && IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) {
> +		struct device_node *np = of_find_compatible_node(NULL, NULL,
> +							     "arm,armv8-timer");
> +		if (np) {
> +			of_node_put(np);
> +			exynos4_mct_frc_start();
> +			return 0;
> +		}
> +	}
>  
>  	ret = exynos4_timer_interrupts(np, int_type);
>  	if (ret)
> 

I tested it on Exynos5433-based TM2 board.

Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
Tested-by: Chanwoo Choi <cw00.choi@...sung.com>


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics