drivers/iio/adc/axp20x_adc.c:572:26: sparse: sparse: dubious: x & !y

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ab27740f76654ed58dd32ac0ba0031c18a6dea3b
commit: 8957e5344353e9cd3f6b1e3004942e35449fa0e8 iio: adc: axp20x_adc: Minor code cleanups
date:   10 months ago
config: csky-buildonly-randconfig-r006-20230413 (https://download.01.org/0day-ci/archive/20240111/202401110159.j4qEZUPp-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20240111/202401110159.j4qEZUPp-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/202401110159.j4qEZUPp-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/iio/adc/axp20x_adc.c:572:26: sparse: sparse: dubious: x & !y
   drivers/iio/adc/axp20x_adc.c:577:26: sparse: sparse: dubious: x & !y
   drivers/iio/adc/axp20x_adc.c: note: in included file (through include/linux/mmzone.h, include/linux/topology.h, include/linux/irq.h, ...):
   include/linux/page-flags.h:246:46: sparse: sparse: self-comparison always evaluates to false

vim +572 drivers/iio/adc/axp20x_adc.c

   551	
   552	static int axp20x_write_raw(struct iio_dev *indio_dev,
   553				    struct iio_chan_spec const *chan, int val, int val2,
   554				    long mask)
   555	{
   556		struct axp20x_adc_iio *info = iio_priv(indio_dev);
   557		unsigned int regmask, regval;
   558	
   559		/*
   560		 * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets
   561		 * for (independently) GPIO0 and GPIO1 when in ADC mode.
   562		 */
   563		if (mask != IIO_CHAN_INFO_OFFSET)
   564			return -EINVAL;
   565	
   566		if (val != 0 && val != 700000)
   567			return -EINVAL;
   568	
   569		switch (chan->channel) {
   570		case AXP20X_GPIO0_V:
   571			regmask = AXP20X_GPIO10_IN_RANGE_GPIO0;
 > 572			regval = FIELD_PREP(AXP20X_GPIO10_IN_RANGE_GPIO0, !!val);
   573			break;
   574	
   575		case AXP20X_GPIO1_V:
   576			regmask = AXP20X_GPIO10_IN_RANGE_GPIO1;
   577			regval = FIELD_PREP(AXP20X_GPIO10_IN_RANGE_GPIO1, !!val);
   578			break;
   579	
   580		default:
   581			return -EINVAL;
   582		}
   583	
   584		return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, regmask, regval);
   585	}
   586	

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