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ARM: stm32f7: fix prescaler calculation of timer

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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@gmail.com>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>
This commit is contained in:
Bo Shen 2017-10-02 22:47:59 -07:00 • committed by Tom Rini
parent af609e3764
commit 72dee54b4e
1 changed files with 1 additions and 1 deletions
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2
arch/arm/mach-stm32/stm32f7/timer.c
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@ -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 */