linux-kernel - Re: [PATCH v3 3/6] clocksource: exynos

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Date:   Thu, 18 Oct 2018 12:50:30 +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 3/6] clocksource: exynos_mct: Refactor resources
 allocation

Hi Marek,

I tested it for both kernel booting and cpu hotplugging
on Exynos5433-based TM2 board.

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

On 2018년 10월 17일 22:41, Marek Szyprowski wrote:
> Move interrupts allocation from exynos4_timer_resources() into separate
> function together with the interrupt number parsing code from
> mct_init_dt(), so the code for managing interrupts is kept together.
> While touching exynos4_timer_resources() function, move of_iomap() to it.
> No functional changes.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  drivers/clocksource/exynos_mct.c | 49 +++++++++++++++++++-------------
>  1 file changed, 30 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
> index 49413900b24c..02ad55db390b 100644
> --- a/drivers/clocksource/exynos_mct.c
> +++ b/drivers/clocksource/exynos_mct.c
> @@ -502,11 +502,14 @@ static int exynos4_mct_dying_cpu(unsigned int cpu)
>  	return 0;
>  }
>  
> -static int __init exynos4_timer_resources(struct device_node *np, void __iomem *base)
> +static int __init exynos4_timer_resources(struct device_node *np)
>  {
> -	int err, cpu;
>  	struct clk *mct_clk, *tick_clk;
>  
> +	reg_base = of_iomap(np, 0);
> +	if (!reg_base)
> +		panic("%s: unable to ioremap mct address space\n", __func__);
> +
>  	tick_clk = of_clk_get_by_name(np, "fin_pll");
>  	if (IS_ERR(tick_clk))
>  		panic("%s: unable to determine tick clock rate\n", __func__);
> @@ -517,9 +520,27 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
>  		panic("%s: unable to retrieve mct clock instance\n", __func__);
>  	clk_prepare_enable(mct_clk);
>  
> -	reg_base = base;
> -	if (!reg_base)
> -		panic("%s: unable to ioremap mct address space\n", __func__);
> +	return 0;
> +}
> +
> +static int __init exynos4_timer_interrupts(struct device_node *np,
> +					   unsigned int int_type)
> +{
> +	int i, err, cpu;
> +
> +	mct_int_type = int_type;
> +
> +	/* This driver uses only one global timer interrupt */
> +	mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
> +
> +	/*
> +	 * Find out the number of local irqs specified. The local
> +	 * timer irqs are specified after the four global timer
> +	 * irqs are specified.
> +	 */
> +	nr_irqs = of_irq_count(np);
> +	for (i = MCT_L0_IRQ; i < nr_irqs; i++)
> +		mct_irqs[i] = irq_of_parse_and_map(np, i);
>  
>  	if (mct_int_type == MCT_INT_PPI) {
>  
> @@ -579,24 +600,14 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
>  
>  static int __init mct_init_dt(struct device_node *np, unsigned int int_type)
>  {
> -	u32 nr_irqs, i;
>  	int ret;
>  
> -	mct_int_type = int_type;
> -
> -	/* This driver uses only one global timer interrupt */
> -	mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
> +	ret = exynos4_timer_resources(np);
> +	if (ret)
> +		return ret;
>  
> -	/*
> -	 * Find out the number of local irqs specified. The local
> -	 * timer irqs are specified after the four global timer
> -	 * irqs are specified.
> -	 */
> -	nr_irqs = of_irq_count(np);
> -	for (i = MCT_L0_IRQ; i < nr_irqs; i++)
> -		mct_irqs[i] = irq_of_parse_and_map(np, i);
>  
> -	ret = exynos4_timer_resources(np, of_iomap(np, 0));
> +	ret = exynos4_timer_interrupts(np, int_type);
>  	if (ret)
>  		return ret;
>  
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics