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

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Date: Fri, 3 May 2024 13:37:50 +0800
From: kernel test robot <lkp@...el.com>
To: Prajna Rajendra Kumar <prajna.rajendrakumar@...rochip.com>,
	Mark Brown <broonie@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	linux-riscv@...ts.infradead.org, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Daire McNamara <daire.mcnamara@...rochip.com>,
	valentina.fernandezalanis@...rochip.com,
	Prajna Rajendra Kumar <prajna.rajendrakumar@...rochip.com>
Subject: Re: [PATCH 1/3] spi: spi-microchip-core: Add support for GPIO based
 CS

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: sh-allmodconfig (https://download.01.org/0day-ci/archive/20240503/202405031322.8UuTAWrf-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240503/202405031322.8UuTAWrf-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405031322.8UuTAWrf-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/spi/spi-microchip-core.c: In function 'mchp_corespi_setup':
>> drivers/spi/spi-microchip-core.c:261:13: warning: the comparison will always evaluate as 'true' for the address of 'cs_gpiod' will never be NULL [-Waddress]
     261 |         if (spi->cs_gpiod)
         |             ^~~
   In file included from drivers/spi/spi-microchip-core.c:21:
   include/linux/spi/spi.h:219:34: note: 'cs_gpiod' declared here
     219 |         struct gpio_desc        *cs_gpiod[SPI_CS_CNT_MAX];      /* Chip select gpio desc */
         |                                  ^~~~~~~~


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	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki