Re: [PATCH v8 9/9] misc: add FPC202 dual port controller driver

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

Hi Romain,

kernel test robot noticed the following build errors:

[auto build test ERROR on 2014c95afecee3e76ca4a56956a936e23283f05b]

url:    https://github.com/intel-lab-lkp/linux/commits/Romain-Gantois/dt-bindings-misc-Describe-TI-FPC202-dual-port-controller/20250227-182532
base:   2014c95afecee3e76ca4a56956a936e23283f05b
patch link:    https://lore.kernel.org/r/20250227-fpc202-v8-9-b7994117fbe2%40bootlin.com
patch subject: [PATCH v8 9/9] misc: add FPC202 dual port controller driver
config: sparc-randconfig-r051-20250302 (https://download.01.org/0day-ci/archive/20250302/202503020450.UW2PuA6X-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250302/202503020450.UW2PuA6X-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/202503020450.UW2PuA6X-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   drivers/misc/ti_fpc202.c: In function 'fpc202_read':
>> drivers/misc/ti_fpc202.c:104:15: error: implicit declaration of function 'i2c_smbus_read_byte_data' [-Wimplicit-function-declaration]
     104 |         val = i2c_smbus_read_byte_data(priv->client, reg);
         |               ^~~~~~~~~~~~~~~~~~~~~~~~
   drivers/misc/ti_fpc202.c: In function 'fpc202_write':
>> drivers/misc/ti_fpc202.c:110:16: error: implicit declaration of function 'i2c_smbus_write_byte_data' [-Wimplicit-function-declaration]
     110 |         return i2c_smbus_write_byte_data(priv->client, reg, value);
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/misc/ti_fpc202.c: At top level:
>> drivers/misc/ti_fpc202.c:433:1: warning: data definition has no type or storage class
     433 | module_i2c_driver(fpc202_driver);
         | ^~~~~~~~~~~~~~~~~
>> drivers/misc/ti_fpc202.c:433:1: error: type defaults to 'int' in declaration of 'module_i2c_driver' [-Wimplicit-int]
>> drivers/misc/ti_fpc202.c:433:1: error: parameter names (without types) in function declaration [-Wdeclaration-missing-parameter-type]
>> drivers/misc/ti_fpc202.c:424:26: warning: 'fpc202_driver' defined but not used [-Wunused-variable]
     424 | static struct i2c_driver fpc202_driver = {
         |                          ^~~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for I2C_ATR
   Depends on [n]: I2C [=n]
   Selected by [y]:
   - TI_FPC202 [=y]


vim +/i2c_smbus_read_byte_data +104 drivers/misc/ti_fpc202.c

    99	
   100	static int fpc202_read(struct fpc202_priv *priv, u8 reg)
   101	{
   102		int val;
   103	
 > 104		val = i2c_smbus_read_byte_data(priv->client, reg);
   105		return val;
   106	}
   107	
   108	static int fpc202_write(struct fpc202_priv *priv, u8 reg, u8 value)
   109	{
 > 110		return i2c_smbus_write_byte_data(priv->client, reg, value);
   111	}
   112	

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