Re: [PATCH 1/2] clocksource/drivers/timer-tegra186: add WDIOC_GETTIMELEFT support

[kernel test robot <lkp@intel.com>]

Hi Pohsun,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/timers/core]
[also build test ERROR on linus/master v6.7 next-20240117]
[cannot apply to daniel-lezcano/clockevents/next]
[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/Pohsun-Su/clocksource-drivers-timer-tegra186-add-WDIOC_GETTIMELEFT-support/20240116-200217
base:   tip/timers/core
patch link:    https://lore.kernel.org/r/20240116115838.16544-2-pohsuns%40nvidia.com
patch subject: [PATCH 1/2] clocksource/drivers/timer-tegra186: add WDIOC_GETTIMELEFT support
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20240117/202401172015.KdPd7tda-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240117/202401172015.KdPd7tda-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401172015.KdPd7tda-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/clocksource/timer-tegra186.c: In function 'tegra186_wdt_get_timeleft':
>> drivers/clocksource/timer-tegra186.c:263:22: error: implicit declaration of function 'FIELD_GET' [-Werror=implicit-function-declaration]
     263 |         expiration = FIELD_GET(WDTSR_CURRENT_EXPIRATION_COUNT, readl_relaxed(wdt->regs + WDTSR));
         |                      ^~~~~~~~~
   cc1: some warnings being treated as errors


vim +/FIELD_GET +263 drivers/clocksource/timer-tegra186.c

   240	
   241	static unsigned int tegra186_wdt_get_timeleft(struct watchdog_device *wdd)
   242	{
   243		struct tegra186_wdt *wdt = to_tegra186_wdt(wdd);
   244		u32 timeleft;
   245		u32 expiration;
   246	
   247		if (!watchdog_active(&wdt->base)) {
   248			/* return zero if the watchdog timer is not activated. */
   249			return 0;
   250		}
   251	
   252		/*
   253		 * System power-on reset occurs on the fifth expiration of the watchdog timer and so
   254		 * when the watchdog timer is configured, the actual value programmed into the counter
   255		 * is 1/5 of the timeout value. Once the counter reaches 0, expiration count will be
   256		 * increased by 1 and the down counter restarts.
   257		 * Hence to get the time left before system reset we must combine 2 parts:
   258		 * 1. value of the current down counter
   259		 * 2. (number of counter expirations remaining) * (timeout/5)
   260		 */
   261	
   262		/* Get the current number of counter expirations. Should be a value between 0 and 4. */
 > 263		expiration = FIELD_GET(WDTSR_CURRENT_EXPIRATION_COUNT, readl_relaxed(wdt->regs + WDTSR));
   264	
   265		/* Convert the current counter value to seconds, rounding up to the nearest second. */
   266		timeleft = FIELD_GET(TMRSR_PCV, readl_relaxed(wdt->tmr->regs + TMRSR));
   267		timeleft = (timeleft + USEC_PER_SEC / 2) / USEC_PER_SEC;
   268	
   269		/*
   270		 * Calculate the time remaining by adding the time for the counter value
   271		 * to the time of the counter expirations that remain.
   272		 */
   273		timeleft += wdt->base.timeout * (4 - expiration) / 5;
   274		return timeleft;
   275	}
   276	

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