Commit-ID: 81abdbbffd69fecdac37fe1d2b44a21227ee23d4 Gitweb: https://git.kernel.org/tip/81abdbbffd69fecdac37fe1d2b44a21227ee23d4 Author: Daniel Lezcano <[email protected]> AuthorDate: Mon, 8 Jan 2018 14:28:58 +0100 Committer: Ingo Molnar <[email protected]> CommitDate: Mon, 8 Jan 2018 17:57:26 +0100
clocksource/drivers/stm32: Add the timer delay callback Add the timer delay callback, that saves us ~90ms of boot time. Tested-by: Benjamin Gaignard <[email protected]> Signed-off-by: Daniel Lezcano <[email protected]> Acked-by: Benjamin Gaignard <[email protected]> Cc: Alexandre Torgue <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Maxime Coquelin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- 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 21b7492..c7d1dae 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,
