drivers/ptp/ptp_clockmatrix.c:107: undefined reference to `i2c_transfer'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6794862a16ef41f753abd75c03a152836e4c8028
commit: 3a6ba7dc7799355557938fbdc15a558236011429 ptp: Add a ptp clock driver for IDT ClockMatrix.
date:   5 weeks ago
config: i386-randconfig-b001-20191211 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-1) 7.5.0
reproduce:
        git checkout 3a6ba7dc7799355557938fbdc15a558236011429
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   ld: drivers/ptp/ptp_clockmatrix.o: in function `idtcm_xfer':
>> drivers/ptp/ptp_clockmatrix.c:107: undefined reference to `i2c_transfer'
   ld: drivers/ptp/ptp_clockmatrix.o: in function `idtcm_driver_init':
>> drivers/ptp/ptp_clockmatrix.c:1425: undefined reference to `i2c_register_driver'
   ld: drivers/ptp/ptp_clockmatrix.o: in function `idtcm_driver_exit':
>> drivers/ptp/ptp_clockmatrix.c:1425: undefined reference to `i2c_del_driver'

vim +107 drivers/ptp/ptp_clockmatrix.c

    86	
    87	static int idtcm_xfer(struct idtcm *idtcm,
    88			      u8 regaddr,
    89			      u8 *buf,
    90			      u16 count,
    91			      bool write)
    92	{
    93		struct i2c_client *client = idtcm->client;
    94		struct i2c_msg msg[2];
    95		int cnt;
    96	
    97		msg[0].addr = client->addr;
    98		msg[0].flags = 0;
    99		msg[0].len = 1;
   100		msg[0].buf = &regaddr;
   101	
   102		msg[1].addr = client->addr;
   103		msg[1].flags = write ? 0 : I2C_M_RD;
   104		msg[1].len = count;
   105		msg[1].buf = buf;
   106	
 > 107		cnt = i2c_transfer(client->adapter, msg, 2);
   108	
   109		if (cnt < 0) {
   110			dev_err(&client->dev, "i2c_transfer returned %d\n", cnt);
   111			return cnt;
   112		} else if (cnt != 2) {
   113			dev_err(&client->dev,
   114				"i2c_transfer sent only %d of %d messages\n", cnt, 2);
   115			return -EIO;
   116		}
   117	
   118		return 0;
   119	}
   120	

---
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