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    Subject[PATCH 19/20] clocksource/drivers/stm32: Add the timer delay
    Date
    Add the timer delay, that saves us ~90ms of boot time.

    Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
    Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com>
    Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com>
    ---
    drivers/clocksource/timer-stm32.c | 13 +++++++++++++
    1 file changed, 13 insertions(+)

    diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c
    index 4634f4d..dcf8445 100644
    --- a/drivers/clocksource/timer-stm32.c
    +++ b/drivers/clocksource/timer-stm32.c
    @@ -9,6 +9,7 @@
    #include <linux/kernel.h>
    #include <linux/clocksource.h>
    #include <linux/clockchips.h>
    +#include <linux/delay.h>
    #include <linux/irq.h>
    #include <linux/interrupt.h>
    #include <linux/of.h>
    @@ -88,6 +89,13 @@ static u64 notrace stm32_read_sched_clock(void)
    return readl_relaxed(stm32_timer_cnt);
    }

    +static struct delay_timer stm32_timer_delay;
    +
    +static unsigned long stm32_read_delay(void)
    +{
    + return readl_relaxed(stm32_timer_cnt);
    +}
    +
    static void stm32_clock_event_disable(struct timer_of *to)
    {
    writel_relaxed(0, timer_of_base(to) + TIM_DIER);
    @@ -230,6 +238,11 @@ static int __init stm32_clocksource_init(struct timer_of *to)
    stm32_timer_cnt = timer_of_base(to) + TIM_CNT;
    sched_clock_register(stm32_read_sched_clock, bits, timer_of_rate(to));
    pr_info("%s: STM32 sched_clock registered\n", name);
    +
    + stm32_timer_delay.read_current_timer = stm32_read_delay;
    + stm32_timer_delay.freq = timer_of_rate(to);
    + register_current_timer_delay(&stm32_timer_delay);
    + pr_info("%s: STM32 delay timer registered\n", name);
    }

    return clocksource_mmio_init(timer_of_base(to) + TIM_CNT, name,
    --
    2.7.4
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