[PATCH 8/8] counter: stm32-timer-cnt: add support for events

[kernel test robot]

Hi Fabrice,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.5 next-20230829]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Fabrice-Gasnier/counter-chrdev-fix-getting-array-extensions/20230829-230111
base:   linus/master
patch link:    https://lore.kernel.org/r/20230829134029.2402868-9-fabrice.gasnier%40foss.st.com
patch subject: [PATCH 8/8] counter: stm32-timer-cnt: add support for events
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230830/202308300133.jtLeSGia-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230830/202308300133.jtLeSGia-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308300133.jtLeSGia-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/counter/stm32-timer-cnt.c: In function 'stm32_count_watch_validate':
>> drivers/counter/stm32-timer-cnt.c:524:20: warning: this statement may fall through [-Wimplicit-fallthrough=]
     524 |                 if (watch->channel >= priv->nchannels) {
         |                    ^
   drivers/counter/stm32-timer-cnt.c:528:9: note: here
     528 |         case COUNTER_EVENT_OVERFLOW_UNDERFLOW:
         |         ^~~~


vim +524 drivers/counter/stm32-timer-cnt.c

   516	
   517	static int stm32_count_watch_validate(struct counter_device *counter,
   518					      const struct counter_watch *watch)
   519	{
   520		struct stm32_timer_cnt *const priv = counter_priv(counter);
   521	
   522		switch (watch->event) {
   523		case COUNTER_EVENT_CAPTURE:
 > 524			if (watch->channel >= priv->nchannels) {
   525				dev_err(counter->parent, "Invalid channel %d\n", watch->channel);
   526				return -EINVAL;
   527			}
   528		case COUNTER_EVENT_OVERFLOW_UNDERFLOW:
   529			return 0;
   530		default:
   531			return -EINVAL;
   532		}
   533	}
   534	

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