linux-kernel - [tip: timers/clocksource] clocksource/drivers/rda: Add sched_clock

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Message-ID: <176416803794.498.5180797545298678811.tip-bot2@tip-bot2>
Date: Wed, 26 Nov 2025 14:40:37 -0000
From: "tip-bot2 for Enlin Mu" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Enlin Mu <enlin.mu@...soc.com>, Daniel Lezcano <daniel.lezcano@...aro.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: timers/clocksource] clocksource/drivers/rda: Add
 sched_clock_register for RDA8810PL SoC

The following commit has been merged into the timers/clocksource branch of tip:

Commit-ID:     627f3f3716a3591f5e6a6bd124c95eef85444080
Gitweb:        https://git.kernel.org/tip/627f3f3716a3591f5e6a6bd124c95eef85444080
Author:        Enlin Mu <enlin.mu@...soc.com>
AuthorDate:    Fri, 07 Nov 2025 14:33:47 +08:00
Committer:     Daniel Lezcano <daniel.lezcano@...aro.org>
CommitterDate: Wed, 26 Nov 2025 11:25:11 +01:00

clocksource/drivers/rda: Add sched_clock_register for RDA8810PL SoC

The current system log timestamp accuracy is tick based, which can not
meet the usage requirements and needs to reach nanoseconds.
Therefore, the sched_clock_register function needs to be added.

[ dlezcano: Fixed typos ]

Signed-off-by: Enlin Mu <enlin.mu@...soc.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://patch.msgid.link/20251107063347.3692-1-enlin.mu@linux.dev
---
 drivers/clocksource/timer-rda.c |  9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-rda.c b/drivers/clocksource/timer-rda.c
index fd1199c..0be8e05 100644
--- a/drivers/clocksource/timer-rda.c
+++ b/drivers/clocksource/timer-rda.c
@@ -13,6 +13,7 @@
 
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/sched_clock.h>
 
 #include "timer-of.h"
 
@@ -153,7 +154,7 @@ static struct timer_of rda_ostimer_of = {
 	},
 };
 
-static u64 rda_hwtimer_read(struct clocksource *cs)
+static u64 rda_hwtimer_clocksource_read(void)
 {
 	void __iomem *base = timer_of_base(&rda_ostimer_of);
 	u32 lo, hi;
@@ -167,6 +168,11 @@ static u64 rda_hwtimer_read(struct clocksource *cs)
 	return ((u64)hi << 32) | lo;
 }
 
+static u64 rda_hwtimer_read(struct clocksource *cs)
+{
+	return rda_hwtimer_clocksource_read();
+}
+
 static struct clocksource rda_hwtimer_clocksource = {
 	.name           = "rda-timer",
 	.rating         = 400,
@@ -185,6 +191,7 @@ static int __init rda_timer_init(struct device_node *np)
 		return ret;
 
 	clocksource_register_hz(&rda_hwtimer_clocksource, rate);
+	sched_clock_register(rda_hwtimer_clocksource_read, 64, rate);
 
 	clockevents_config_and_register(&rda_ostimer_of.clkevt, rate,
 					0x2, UINT_MAX);