xiaoxiang781216 commented on code in PR #17071:
URL: https://github.com/apache/nuttx/pull/17071#discussion_r2380678589


##########
drivers/timers/CMakeLists.txt:
##########
@@ -22,6 +22,13 @@
 
 set(SRCS)
 
+# Unless a driver with a more accurate version of up_*delay is enabled, always
+# include the base delay definition (busy-loop) as a minimum-viable product.
+
+if(NOT CONFIG_TIMER_ARCH)

Review Comment:
   before up_udelay is implemented by arch/driver, that's why the 
implementation in driver call the internal function to get the timestamp. With 
your implementation, up_udelay is part of sched, so it could call 
clock_systime_timespec to get more accuracy. The only problem is that we need 
check the context(early boot, interrupt) before calling clock_systime_timespec.



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