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arch/sim: register RTC after clock initialization

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Registering /dev/rtc0 from up_rtc_initialize() creates the pseudofs inode before clock_inittime() synchronizes CLOCK_REALTIME. Its timestamp is consequently zero and omitted by ls -l.

Keep lower-half setup in early RTC initialization, but defer character-device registration to up_initialize(), which runs after clock initialization.

Fixes #19504

Signed-off-by: hanzhijian <hanzhijian@zepp.com>
This commit is contained in:
hanzhijian 2026-07-24 10:07:07 +08:00 • committed by Alin Jerpelea
parent 564fae94d7
commit 634d8a1272
3 changed files with 38 additions and 1 deletions
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8
arch/sim/src/sim/sim_initialize.c
View file

@ -266,6 +266,14 @@ void up_initialize(void)
sim_init_cmdline();
#endif
#ifdef CONFIG_RTC_DRIVER
/* Register the RTC after clock_initialize() has synchronized system
* time.
*/
sim_rtc_initialize();
#endif
/* Register some tty-port to access tty-port on sim platform */
sim_uartinit();

6
arch/sim/src/sim/sim_internal.h
View file

@ -276,6 +276,12 @@ int sim_init_func_call_ipi(int irq);
void sim_timer_update(void);
#endif
/* sim_rtc.c ****************************************************************/
#ifdef CONFIG_RTC_DRIVER
int sim_rtc_initialize(void);
#endif
/* sim_uart.c ***************************************************************/
void sim_uartinit(void);

25
arch/sim/src/sim/sim_rtc.c
View file

@ -59,6 +59,7 @@ static struct rtc_lowerhalf_s g_sim_rtc =
.ops = &g_sim_rtc_ops,
};
static struct rtc_lowerhalf_s *g_sim_rtc_lower;
static int64_t g_sim_delta;
/****************************************************************************
@ -134,6 +135,28 @@ int up_rtc_initialize(void)
rtc = rpmsg_rtc_initialize();
sync = false;
#endif
g_sim_rtc_lower = rtc;
up_rtc_set_lowerhalf(rtc, sync);
return rtc_initialize(0, rtc);
return OK;
}
/****************************************************************************
* Name: sim_rtc_initialize
*
* Description:
* Register the SIM RTC driver after the system clock has been initialized.
* This ensures that the /dev/rtc0 inode receives a valid timestamp.
*
* Input Parameters:
* None
*
* Returned Value:
* Zero (OK) on success; a negated errno on failure
*
****************************************************************************/
int sim_rtc_initialize(void)
{
return rtc_initialize(0, g_sim_rtc_lower);
}