drivers/i2c/busses/i2c-omap.c:608:24: error: implicit declaration of function 'FIELD_PREP'

drivers/i2c/busses/i2c-omap.c:608:24: error: implicit declaration of function 'FIELD_PREP'

[kernel test robot]

tree:   https://github.com/intel-lab-lkp/linux/commits/Andrew-Davis/i2c-omap-Drop-bit-shift-for-I2C-register-addresses/20260904-081245
head:   80bb64593f6862ec848394a6fc7e7946dcb93fe1
commit: 80bb64593f6862ec848394a6fc7e7946dcb93fe1 i2c: omap: Add OMAP_I2C_BUF_{TX,RX}TRSH definitions
date:   24 hours ago
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20260908/202609080003.dbREhhYS-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260908/202609080003.dbREhhYS-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/202609080003.dbREhhYS-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/i2c/busses/i2c-omap.c: In function 'omap_i2c_resize_fifo':
>> drivers/i2c/busses/i2c-omap.c:608:24: error: implicit declaration of function 'FIELD_PREP' [-Wimplicit-function-declaration]
     608 |                 buf |= FIELD_PREP(OMAP_I2C_BUF_RXTRSH, (omap->threshold - 1));
         |                        ^~~~~~~~~~


vim +/FIELD_PREP +608 drivers/i2c/busses/i2c-omap.c

   586	
   587	static void omap_i2c_resize_fifo(struct omap_i2c_dev *omap, u8 size, bool is_rx)
   588	{
   589		u16		buf;
   590	
   591		if (omap->flags & OMAP_I2C_FLAG_NO_FIFO)
   592			return;
   593	
   594		/*
   595		 * Set up notification threshold based on message size. We're doing
   596		 * this to try and avoid draining feature as much as possible. Whenever
   597		 * we have big messages to transfer (bigger than our total fifo size)
   598		 * then we might use draining feature to transfer the remaining bytes.
   599		 */
   600	
   601		omap->threshold = clamp(size, (u8) 1, omap->fifo_size);
   602	
   603		buf = omap_i2c_read_reg(omap, OMAP_I2C_BUF_REG);
   604	
   605		if (is_rx) {
   606			/* Clear RX Threshold */
   607			buf &= ~OMAP_I2C_BUF_RXTRSH;
 > 608			buf |= FIELD_PREP(OMAP_I2C_BUF_RXTRSH, (omap->threshold - 1));
   609			buf |= OMAP_I2C_BUF_RXFIF_CLR;
   610		} else {
   611			/* Clear TX Threshold */
   612			buf &= ~OMAP_I2C_BUF_TXTRSH;
   613			buf |= FIELD_PREP(OMAP_I2C_BUF_TXTRSH, (omap->threshold - 1));
   614			buf |= OMAP_I2C_BUF_TXFIF_CLR;
   615		}
   616	
   617		omap_i2c_write_reg(omap, OMAP_I2C_BUF_REG, buf);
   618	
   619		if (omap->rev < OMAP_I2C_REV_ON_3630)
   620			omap->b_hw = true; /* Enable hardware fixes */
   621	
   622		/* calculate wakeup latency constraint for MPU */
   623		if (omap->set_mpu_wkup_lat != NULL)
   624			omap->latency = (1000000 * omap->threshold) /
   625				(1000 * omap->speed / 8);
   626	}
   627	

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