[U-Boot] [PATCH] ARM: stm32f7: fix prescaler calculation of timer

[Vikas MANOCHA]

> -----Original Message-----
> From: Bo Shen [mailto:voice.shen at gmail.com]
> Sent: Monday, October 02, 2017 10:48 PM
> To: albert.u.boot at aribaud.net; Vikas MANOCHA <vikas.manocha at st.com>
> Cc: u-boot at lists.denx.de; Bo Shen <voice.shen at gmail.com>
> Subject: [PATCH] ARM: stm32f7: fix prescaler calculation of timer
> 
> As the timer 2 is on APB1 bus, the maximum of clock frequency of APB1 timer clock is half of SYSCLK. Then to calculate the timer
> prescaler for timer 2 which need to be divided by 2.
> 
> Signed-off-by: Bo Shen <voice.shen at gmail.com>

Reviewed-by: Vikas Manocha <vikas.manocha at st.com>

Cheers,
Vikas

> ---
>  arch/arm/mach-stm32/stm32f7/timer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-stm32/stm32f7/timer.c b/arch/arm/mach-stm32/stm32f7/timer.c
> index c15f8bb..b04c101 100644
> --- a/arch/arm/mach-stm32/stm32f7/timer.c
> +++ b/arch/arm/mach-stm32/stm32f7/timer.c
> @@ -26,7 +26,7 @@ int timer_init(void)
>  	/* Stop the timer */
>  	writel(readl(&gpt1_regs_ptr->cr1) & ~GPT_CR1_CEN, &gpt1_regs_ptr->cr1);
> 
> -	writel((CONFIG_SYS_CLK_FREQ/CONFIG_SYS_HZ_CLOCK) - 1,
> +	writel((CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ_CLOCK) - 1,
>  						&gpt1_regs_ptr->psc);
> 
>  	/* Configure timer for auto-reload */
> --
> 2.7.4