[PATCH 5/7] soc: aspeed: Add eSPI flash channel support

[kernel test robot]

Hi aspeedyh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 0257f64bdac7fdca30fa3cae0df8b9ecbec7733a]

url:    https://github.com/intel-lab-lkp/linux/commits/aspeedyh/dt-bindings-soc-aspeed-Add-AST2600-eSPI-controller/20260315-101647
base:   0257f64bdac7fdca30fa3cae0df8b9ecbec7733a
patch link:    https://lore.kernel.org/r/20260313-upstream_espi-v1-5-9504428e1f43%40aspeedtech.com
patch subject: [PATCH 5/7] soc: aspeed: Add eSPI flash channel support
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20260320/202603200700.6fddOZHQ-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260320/202603200700.6fddOZHQ-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/202603200700.6fddOZHQ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/soc/aspeed/espi/ast2600-espi.c: In function 'ast2600_espi_flash_reset':
   drivers/soc/aspeed/espi/ast2600-espi.c:137:16: error: implicit declaration of function 'FIELD_PREP' [-Wimplicit-function-declaration]
     137 |         reg |= FIELD_PREP(ESPI_CTRL_FLASH_TAFS_MODE, flash->tafs.mode);
         |                ^~~~~~~~~~
   drivers/soc/aspeed/espi/ast2600-espi.c: In function 'ast2600_espi_flash_remove':
>> drivers/soc/aspeed/espi/ast2600-espi.c:172:35: warning: variable 'flash' set but not used [-Wunused-but-set-variable]
     172 |         struct aspeed_espi_flash *flash;
         |                                   ^~~~~
   drivers/soc/aspeed/espi/ast2600-espi.c: In function 'ast2600_espi_flash_get_hdr':
   drivers/soc/aspeed/espi/ast2600-espi.c:194:20: error: implicit declaration of function 'FIELD_GET' [-Wimplicit-function-declaration]
     194 |         hdr->cyc = FIELD_GET(ESPI_FLASH_RX_CTRL_CYC, reg);
         |                    ^~~~~~~~~


vim +/flash +172 drivers/soc/aspeed/espi/ast2600-espi.c

   169	
   170	int ast2600_espi_flash_remove(struct aspeed_espi *espi)
   171	{
 > 172		struct aspeed_espi_flash *flash;
   173		u32 reg;
   174	
   175		flash = &espi->flash;
   176	
   177		writel(ESPI_INT_EN_FLASH, espi->regs + ESPI_INT_EN_CLR);
   178	
   179		reg = readl(espi->regs + ESPI_CTRL);
   180		reg &= ~(ESPI_CTRL_FLASH_TX_DMA_EN
   181			 | ESPI_CTRL_FLASH_RX_DMA_EN
   182			 | ESPI_CTRL_FLASH_SW_RDY);
   183		writel(reg, espi->regs + ESPI_CTRL);
   184	
   185		return 0;
   186	}
   187	

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