linux-kernel - [PATCH V2] clocksource/drivers/rda: Add sched_clock

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Message-Id: <20251107063347.3692-1-enlin.mu@linux.dev>
Date: Fri,  7 Nov 2025 14:33:47 +0800
From: Enlin Mu <enlin.mu@...ux.dev>
To: mani@...nel.org,
	daniel.lezcano@...aro.org,
	tglx@...utronix.de,
	linux-arm-kernel@...ts.infradead.org,
	linux-unisoc@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	enlin.mu@...soc.com,
	enlin.mu@...ux.dev
Subject: [PATCH V2] clocksource/drivers/rda: Add sched_clock_register for RDA8810PL SoC

From: Enlin Mu <enlin.mu@...soc.com>

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

Signed-off-by: Enlin Mu <enlin.mu@...soc.com>
---
 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 fd1199c189bf..0be8e05970e2 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);
-- 
2.39.5