Merge tag 'timers-clocksource-2025-11-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull clocksource updates from Thomas Gleixner:
 "Updates for clocksource and clockevent drivers:

   - A new driver for the Realtel system timer

   - Prevent the unbinding of timers when the drivers do not support
     that

   - Expand the timer counter readout for the SPRD driver to 64 bit
     to allow IOT devices suspend times of more than 36 hours, which
     is the current limit of the 32-bi readout

   - The usual small cleanups, fixes and enhancements all over the
     place"

* tag 'timers-clocksource-2025-11-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource/drivers: Add Realtek system timer driver
  dt-bindings: timer: Add Realtek SYSTIMER
  clocksource/drivers/stm32-lp: Drop unused module alias
  clocksource/drivers/rda: Add sched_clock_register for RDA8810PL SoC
  clocksource/drivers/nxp-stm: Prevent driver unbind
  clocksource/drivers/nxp-pit: Prevent driver unbind
  clocksource/drivers/arm_arch_timer_mmio: Prevent driver unbind
  clocksource/drivers/nxp-stm: Fix section mismatches
  clocksource/drivers/sh_cmt: Always leave device running after probe
  clocksource/drivers/stm: Fix double deregistration on probe failure
  clocksource/drivers/ralink: Fix resource leaks in init error path
  clocksource/drivers/timer-sp804: Fix read_current_timer() issue when clock source is not registered
  clocksource/drivers/sprd: Enable register for timer counter from 32 bit to 64 bit

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/clocksource/timer-sp804.c b/drivers/clocksource/timer-sp804.c
index cd1916c05325..e82a95ea4724 100644
--- a/drivers/clocksource/timer-sp804.c
+++ b/drivers/clocksource/timer-sp804.c
@@ -21,6 +21,10 @@
 #include <linux/of_irq.h>
 #include <linux/sched_clock.h>
 
+#ifdef CONFIG_ARM
+#include <linux/delay.h>
+#endif
+
 #include "timer-sp.h"
 
 /* Hisilicon 64-bit timer(a variant of ARM SP804) */
@@ -102,6 +106,23 @@ static u64 notrace sp804_read(void)
 	return ~readl_relaxed(sched_clkevt->value);
 }
 
+#ifdef CONFIG_ARM
+static struct delay_timer delay;
+static unsigned long sp804_read_delay_timer_read(void)
+{
+	return sp804_read();
+}
+
+static void sp804_register_delay_timer(int freq)
+{
+	delay.freq = freq;
+	delay.read_current_timer = sp804_read_delay_timer_read;
+	register_current_timer_delay(&delay);
+}
+#else
+static inline void sp804_register_delay_timer(int freq) {}
+#endif
+
 static int __init sp804_clocksource_and_sched_clock_init(void __iomem *base,
 							 const char *name,
 							 struct clk *clk,
@@ -114,6 +135,8 @@ static int __init sp804_clocksource_and_sched_clock_init(void __iomem *base,
 	if (rate < 0)
 		return -EINVAL;
 
+	sp804_register_delay_timer(rate);
+
 	clkevt = sp804_clkevt_get(base);
 
 	writel(0, clkevt->ctrl);
@@ -318,6 +341,7 @@ static int __init sp804_of_init(struct device_node *np, struct sp804_timer *time
 		if (ret)
 			goto err;
 	}
+
 	initialized = true;
 
 	return 0;