From a86af7abcdbbcbfef76730b8ab1bdbab4f73d53f Mon Sep 17 00:00:00 2001
From: wangchengdong <wangchengdong@lixiang.com>
Date: Mon, 15 Dec 2025 09:25:04 +0800
Subject: [PATCH] drivers/timers: Implement up_alarm_start() in arch_alarm.c

 Add the implementation of up_alarm_start() in arch_alarm.c.

Signed-off-by: Chengdong Wang wangchengdong@lixiang.com
---
 drivers/timers/arch_alarm.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/timers/arch_alarm.c b/drivers/timers/arch_alarm.c
index de1019ab871..4377d37fbcc 100644
--- a/drivers/timers/arch_alarm.c
+++ b/drivers/timers/arch_alarm.c
@@ -367,6 +367,18 @@ int weak_function up_alarm_tick_cancel(FAR clock_t *ticks)
  *
  ****************************************************************************/
 
+int weak_function up_alarm_start(const struct timespec *ts)
+{
+  int ret = -EAGAIN;
+
+  if (g_oneshot_lower != NULL)
+    {
+      ret = ONESHOT_ABSOLUTE(g_oneshot_lower, ts);
+    }
+
+  return ret;
+}
+
 #ifdef CONFIG_SCHED_TICKLESS
 int weak_function up_alarm_tick_start(clock_t ticks)
 {