linguini1 commented on code in PR #17071:
URL: https://github.com/apache/nuttx/pull/17071#discussion_r2380032265


##########
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:
   After looking at this, I think it would need a separate PR and time to 
think. The `up_udelay` in the timer implementation is dependent on the timer 
driver lower-half. I'm not certain right now what the best way to replace that 
with `clock_systime_timespec` is, and it would require a lot more testing.



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