Subject: Re: [v2] ARM: dts: ls1021a: output PPS signal on FIPER2

From: Richard Cochran <[email-masked]>
Date: Tue, 19 May 2020 09:15:28 -0700

On Tue, May 19, 2020 at 10:53:07AM +0800, Yangbo Lu wrote:
> The timer fixed interval period pulse generator register
> is used to generate periodic pulses. The down count
> register loads the value programmed in the fixed period
> interval (FIPER). At every tick of the timer accumulator
> overflow, the counter decrements by the value of
> TMR_CTRL[TCLK_PERIOD]. It generates a pulse when the down
> counter value reaches zero. It reloads the down counter
> in the cycle following a pulse. To use the TMR_FIPER
> register to generate a 1 PPS event, the value
> (10^9 nanoseconds) - TCLK_PERIOD should be programmed.
> It should be 999999995 since TCLK_PERIOD is 5.
> 
> This patch is to output PPS signal on FIPER2 which is more
> desired by user.

I think it wouldn't hurt to spell out the effect of this change:
Before, the period of FIPER2 was 100 microseconds.
Now, the period of FIPER2 is one second.

Thanks,
Richard

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