Phil-Engljaehringer commented on PR #20890:
URL: https://github.com/apache/nuttx/pull/20890#issuecomment-6367370838

   @acassis @xiaoxiang781216 
   Sorry for the re-review. I pushed one small follow-up change, the rest is 
unchanged:
   
   - New `imx9_mu_enable_irq()` in `imx9_mu.c/.h`: only does the `irq_attach()` 
+ `up_enable_irq()`. `imx9_mu_init()` now calls it. Its behaviour and order are 
unchanged.
   - `imx9_scmi_notify_register()` calls `imx9_mu_enable_irq(g_mudev)` instead 
of calling `imx9_mu_init(5)` a second time. `imx9_mu_init()` also clears the MU 
callbacks, so calling it again could silently drop a callback registered 
earlier. Nothing registers one on MU5 before this today, so it's a safety fix, 
not a behaviour change.
   
   Re-tested: checkpatch (`-c -u -m -g`) passes, `mr-navq95b:rpmsg` and `:nsh` 
build without warnings, and on hardware the LM2 shutdown/boot events still 
arrive on a Linux reboot.
   


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