I have written support for rtc ds1343 which uses
spi interface through regmap spi and uses the
following api

devm_regmap_init_spi(spi, &config);

during compilation following error occurs

drivers/built-in.o: In function `ds1343_probe':
>> rtc-ds1343.c:(.text+0x1baf8f): undefined reference to `devm_regmap_init_spi'

in the .config file following are the regmap support defined

CONFIG_REGMAP=y
CONFIG_REGMAP_I2C=m
CONFIG_REGMAP_SPI=m
CONFIG_REGMAP_MMIO=y
CONFIG_REGMAP_IRQ=y

the CONFIG_REGMAP is declared even then the error in compilation
occurs. i have also attached the config file