linux-kernel - Re: [PATCH 01/41] clocksource: asm9260: Migrate to new 'set-state' interface

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Date:	Tue, 30 Jun 2015 10:25:12 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Oleksij Rempel <linux@...pel-privat.de>
Subject: Re: [PATCH 01/41] clocksource: asm9260: Migrate to new 'set-state'
 interface

On 06/18/2015 12:54 PM, Viresh Kumar wrote:
> Migrate asm9260 driver to the new 'set-state' interface provided by
> clockevents core, the earlier 'set-mode' interface is marked obsolete
> now.
>
> This also enables us to implement callbacks for new states of clockevent
> devices, for example: ONESHOT_STOPPED.

Could you add in the changelog the subtle change with set_mode(RESUME) 
and this code. As a default the timer was stopped when entering in the 
set_mode function, now with the new API, this is done explicitly.

> Cc: Oleksij Rempel <linux@...pel-privat.de>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---

[ ... ]

> +static int asm9260_timer_shutdown(struct clock_event_device *evt)
>   {
>   	/* stop timer0 */
>   	writel_relaxed(BM_C0_EN, priv.base + HW_TCR + CLR_REG);
> +	return 0;
> +}
> +
> +static int asm9260_timer_set_oneshot(struct clock_event_device *evt)
> +{
> +	/* stop timer0 */
> +	writel_relaxed(BM_C0_EN, priv.base + HW_TCR + CLR_REG);

Can you replace this line with a call to asm9260_timer_shutdown ?

> +	/* enable reset and stop on match */
> +	writel_relaxed(BM_MCR_RES_EN(0) | BM_MCR_STOP_EN(0),
> +		       priv.base + HW_MCR + SET_REG);
> +	return 0;
> +}

[ ... ]

> +static int asm9260_timer_set_periodic(struct clock_event_device *evt)
> +{
> +	/* stop timer0 */
> +	writel_relaxed(BM_C0_EN, priv.base + HW_TCR + CLR_REG);

idem.

Thanks

   -- Daniel

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