linux-kernel - [tip:timers/core] clocksource/drivers/stm32: Add the timer delay callback

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Date:   Mon, 8 Jan 2018 09:33:53 -0800
From:   tip-bot for Daniel Lezcano <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     alexandre.torgue@...com, daniel.lezcano@...aro.org,
        peterz@...radead.org, mcoquelin.stm32@...il.com, hpa@...or.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        benjamin.gaignard@...com, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip:timers/core] clocksource/drivers/stm32: Add the timer delay
 callback

Commit-ID:  81abdbbffd69fecdac37fe1d2b44a21227ee23d4
Gitweb:     https://git.kernel.org/tip/81abdbbffd69fecdac37fe1d2b44a21227ee23d4
Author:     Daniel Lezcano <daniel.lezcano@...aro.org>
AuthorDate: Mon, 8 Jan 2018 14:28:58 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
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 <benjamin.gaignard@...com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Acked-by: Benjamin Gaignard <benjamin.gaignard@...com>
Cc: Alexandre Torgue <alexandre.torgue@...com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1515418139-23276-19-git-send-email-daniel.lezcano@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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,