Re: [PATCH] gpio: pca953x: Add support for level-triggered interrupts

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

Hi Potin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 2014c95afecee3e76ca4a56956a936e23283f05b]

url:    https://github.com/intel-lab-lkp/linux/commits/Potin-Lai/gpio-pca953x-Add-support-for-level-triggered-interrupts/20250318-004441
base:   2014c95afecee3e76ca4a56956a936e23283f05b
patch link:    https://lore.kernel.org/r/20250318-gpio-pca953x-level-triggered-irq-v1-1-0c4943d92425%40gmail.com
patch subject: [PATCH] gpio: pca953x: Add support for level-triggered interrupts
config: x86_64-buildonly-randconfig-002-20250318 (https://download.01.org/0day-ci/archive/20250318/202503181231.ZqKVm0Z8-lkp@intel.com/config)
compiler: clang version 20.1.0 (https://github.com/llvm/llvm-project 24a30daaa559829ad079f2ff7f73eb4e18095f88)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250318/202503181231.ZqKVm0Z8-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/202503181231.ZqKVm0Z8-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpio/gpio-pca953x.c:887:43: warning: address of array 'chip->irq_trig_level_low' will always evaluate to 'true' [-Wpointer-bool-conversion]
     887 |         if (!chip->irq_trig_level_high && !chip->irq_trig_level_low) {
         |                                           ~~~~~~~^~~~~~~~~~~~~~~~~~
>> drivers/gpio/gpio-pca953x.c:887:13: warning: address of array 'chip->irq_trig_level_high' will always evaluate to 'true' [-Wpointer-bool-conversion]
     887 |         if (!chip->irq_trig_level_high && !chip->irq_trig_level_low) {
         |             ~~~~~~~^~~~~~~~~~~~~~~~~~~
   2 warnings generated.


vim +887 drivers/gpio/gpio-pca953x.c

   841	
   842	static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pending)
   843	{
   844		struct gpio_chip *gc = &chip->gpio_chip;
   845		DECLARE_BITMAP(reg_direction, MAX_LINE);
   846		DECLARE_BITMAP(old_stat, MAX_LINE);
   847		DECLARE_BITMAP(cur_stat, MAX_LINE);
   848		DECLARE_BITMAP(new_stat, MAX_LINE);
   849		DECLARE_BITMAP(trigger, MAX_LINE);
   850		DECLARE_BITMAP(edges, MAX_LINE);
   851		int ret;
   852	
   853		if (chip->driver_data & PCA_PCAL) {
   854			/* Read the current interrupt status from the device */
   855			ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
   856			if (ret)
   857				return false;
   858	
   859			/* Check latched inputs and clear interrupt status */
   860			ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
   861			if (ret)
   862				return false;
   863	
   864			/* Apply filter for rising/falling edge selection */
   865			bitmap_replace(new_stat, chip->irq_trig_fall, chip->irq_trig_raise, cur_stat, gc->ngpio);
   866	
   867			bitmap_and(pending, new_stat, trigger, gc->ngpio);
   868	
   869			return !bitmap_empty(pending, gc->ngpio);
   870		}
   871	
   872		ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
   873		if (ret)
   874			return false;
   875	
   876		/* Remove output pins from the equation */
   877		pca953x_read_regs(chip, chip->regs->direction, reg_direction);
   878	
   879		bitmap_copy(old_stat, chip->irq_stat, gc->ngpio);
   880	
   881		bitmap_and(new_stat, cur_stat, reg_direction, gc->ngpio);
   882		bitmap_xor(cur_stat, new_stat, old_stat, gc->ngpio);
   883		bitmap_and(trigger, cur_stat, chip->irq_mask, gc->ngpio);
   884	
   885		bitmap_copy(chip->irq_stat, new_stat, gc->ngpio);
   886	
 > 887		if (!chip->irq_trig_level_high && !chip->irq_trig_level_low) {
   888			if (bitmap_empty(trigger, gc->ngpio))
   889				return false;
   890		}
   891	
   892		bitmap_and(cur_stat, chip->irq_trig_fall, old_stat, gc->ngpio);
   893		bitmap_and(old_stat, chip->irq_trig_raise, new_stat, gc->ngpio);
   894		bitmap_or(edges, old_stat, cur_stat, gc->ngpio);
   895		bitmap_and(pending, edges, trigger, gc->ngpio);
   896	
   897		bitmap_and(cur_stat, new_stat, chip->irq_trig_level_high, gc->ngpio);
   898		bitmap_and(cur_stat, cur_stat, chip->irq_mask, gc->ngpio);
   899		bitmap_or(pending, pending, cur_stat, gc->ngpio);
   900	
   901		bitmap_complement(cur_stat, new_stat, gc->ngpio);
   902		bitmap_and(cur_stat, cur_stat, reg_direction, gc->ngpio);
   903		bitmap_and(old_stat, cur_stat, chip->irq_trig_level_low, gc->ngpio);
   904		bitmap_and(old_stat, old_stat, chip->irq_mask, gc->ngpio);
   905		bitmap_or(pending, pending, old_stat, gc->ngpio);
   906	
   907		return !bitmap_empty(pending, gc->ngpio);
   908	}
   909	

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