> -		/* Wait for the counter to stop: two 32k clock cycles */
> -		usleep_range(61, 100);
> +		/* Wait for the counter to stop: two RTC_PCLK clock cycles */
> +		usleep_range(rtc->sync_time, rtc->sync_time + 100);

Hmm, 100 seems more arbitrary here than in the original code? Maybe 2 *
sync_time like below?

> @@ -444,12 +445,20 @@ static int rzn1_rtc_probe(struct platform_device *pdev)
>  			scmp_val = RZN1_RTC_CTL0_SLSB_SCMP;
>  	}
>  
> +	/*
> +	 * The internal clock counter operates in synchronization with the
> +	 * RTC_PCLK clock. Calculate the duration of two RTC_PCLK clock
> +	 * cycles in microseconds required for operations to complete.
> +	 */

Too wordy, this is enough IMHO:

/* Calculate the duration of two RTC_PCLK clock cycles */

Rest looks good.