CONFIG_GPIO_TWL4030 needs to be set in menuconfig otherwise, for OMAP3 defconfig we get the below build error. arch/arm/mach-omap2/built-in.o: In function `hsmmc_card_detect': /share/anand/tony/arch/arm/mach-omap2/hsmmc.c:50: undefined reference to `twl4030_get_gpio_datain' arch/arm/mach-omap2/built-in.o: In function `hsmmc_cleanup': /share/anand/tony/arch/arm/mach-omap2/hsmmc.c:82: undefined reference to `twl4030_free_gpio' arch/arm/mach-omap2/built-in.o: In function `hsmmc_late_init': /share/anand/tony/arch/arm/mach-omap2/hsmmc.c:63: undefined reference to `twl4030_request_gpio' /share/anand/tony/arch/arm/mach-omap2/hsmmc.c:67: undefined reference to `twl4030_set_gpio_debounce' make: *** [.tmp_vmlinux1] Error 1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html