linux-kernel - Re: [PATCH] clocksource: dw

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Date:   Wed, 26 Sep 2018 17:21:39 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Dinh Nguyen <dinguyen@...nel.org>
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        Marek Vasut <marex@...x.de>
Subject: Re: [PATCH] clocksource: dw_apb: add reset control

On 17/09/2018 16:52, Dinh Nguyen wrote:
> Add code to retrieve the reset property for the dw-apb timers.

The patch does more than that. Can you explain why the assert/deassert ?


> Signed-off-by: Marek Vasut <marex@...x.de>
> Signed-off-by: Dinh Nguyen <dinguyen@...nel.org>
> ---
>  drivers/clocksource/dw_apb_timer_of.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/clocksource/dw_apb_timer_of.c b/drivers/clocksource/dw_apb_timer_of.c
> index 69866cd..24bc073 100644
> --- a/drivers/clocksource/dw_apb_timer_of.c
> +++ b/drivers/clocksource/dw_apb_timer_of.c
> @@ -22,6 +22,7 @@
>  #include <linux/of_address.h>
>  #include <linux/of_irq.h>
>  #include <linux/clk.h>
> +#include <linux/reset.h>
>  #include <linux/sched_clock.h>
>  
>  static void __init timer_get_base_and_rate(struct device_node *np,
> @@ -29,12 +30,20 @@ static void __init timer_get_base_and_rate(struct device_node *np,
>  {
>  	struct clk *timer_clk;
>  	struct clk *pclk;
> +	struct reset_control *rstc;
>  
>  	*base = of_iomap(np, 0);
>  
>  	if (!*base)
>  		panic("Unable to map regs for %s", np->name);
>  
> +	/* Unreset the timer if applicable */
> +	rstc = of_reset_control_get(np, NULL);
> +	if (!IS_ERR(rstc)) {
> +		reset_control_assert(rstc);
> +		reset_control_deassert(rstc);
> +	}
> +
>  	/*
>  	 * Not all implementations use a periphal clock, so don't panic
>  	 * if it's not present
> 


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