linux-kernel - Re: [PATCH V2] clockevents: rockchip: Add rockchip timer for rk3288

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Date:	Mon, 26 Jan 2015 10:33:23 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Kever Yang <kever.yang@...k-chips.com>, heiko@...ech.de
CC:	devicetree@...r.kernel.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH V2] clockevents: rockchip: Add rockchip timer for rk3288

On 01/26/2015 02:25 AM, Kever Yang wrote:
> Hi Daniel,

Hi Kever,

[ ... ]

>> +static inline int rk_timer_set_next_event(unsigned long cycles,
>> +                      struct clock_event_device *ce)
>> +{
>> +    rk_timer_disable(ce);
>> +    rk_timer_update_counter(cycles, ce);
>> +    rk_timer_enable(ce, TIMER_MODE_USER_DEFINED_COUNT);
>> +    return 0;
>> +}
>> +
>> +static inline void rk_timer_set_mode(enum clock_event_mode mode,
>> +                     struct clock_event_device *ce)
>> +{
>> +    switch (mode) {
>> +    case CLOCK_EVT_MODE_PERIODIC:
>> +        rk_timer_disable(ce);
>> +        rk_timer_update_counter(rk_timer(ce)->freq / HZ - 1, ce);
>> +        rk_timer_enable(ce, TIMER_MODE_FREE_RUNNING);
>> +    case CLOCK_EVT_MODE_ONESHOT:
> This driver seems init the timer as ONE SHOT mode, and we can
> set to PERIODIC by this code, but what if user set the timer
> as PERIODIC mode and then want to set back to ONESHOT mode?

Mmh, I think that will be followed by a call set_next_event, hence 
disabling the timer and set the right mode with the next event.


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