[PATCH 1/3] spi: spi-microchip-core: Add support for GPIO based CS

[kernel test robot]

Hi Prajna,

kernel test robot noticed the following build warnings:

[auto build test WARNING on broonie-spi/for-next]
[also build test WARNING on robh/for-next krzk-dt/for-next linus/master v6.9-rc6 next-20240502]
[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/Prajna-Rajendra-Kumar/spi-spi-microchip-core-Add-support-for-GPIO-based-CS/20240502-223714
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
patch link:    https://lore.kernel.org/r/20240502143410.12629-2-prajna.rajendrakumar%40microchip.com
patch subject: [PATCH 1/3] spi: spi-microchip-core: Add support for GPIO based CS
config: arm-randconfig-002-20240503 (https://download.01.org/0day-ci/archive/20240503/202405031328.ljBB1tMb-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 37ae4ad0eef338776c7e2cffb3896153d43dcd90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240503/202405031328.ljBB1tMb-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/202405031328.ljBB1tMb-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/spi/spi-microchip-core.c:21:
   In file included from include/linux/spi/spi.h:17:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2208:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/spi/spi-microchip-core.c:261:11: warning: address of array 'spi->cs_gpiod' will always evaluate to 'true' [-Wpointer-bool-conversion]
     261 |         if (spi->cs_gpiod)
         |         ~~  ~~~~~^~~~~~~~
   2 warnings generated.


vim +261 drivers/spi/spi-microchip-core.c

   255	
   256	static int mchp_corespi_setup(struct spi_device *spi)
   257	{
   258		struct mchp_corespi *corespi = spi_controller_get_devdata(spi->controller);
   259		u32 reg;
   260	
 > 261		if (spi->cs_gpiod)
   262			return 0;
   263	
   264		/*
   265		 * Active high targets need to be specifically set to their inactive
   266		 * states during probe by adding them to the "control group" & thus
   267		 * driving their select line low.
   268		 */
   269		if (spi->mode & SPI_CS_HIGH) {
   270			reg = mchp_corespi_read(corespi, REG_SLAVE_SELECT);
   271			reg |= BIT(spi_get_chipselect(spi, 0));
   272			mchp_corespi_write(corespi, REG_SLAVE_SELECT, reg);
   273		}
   274		return 0;
   275	}
   276	

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