ak8975 depends on I2C and GPIOLIB, so any symbols that selects ak8975 must have the same dependency, or we get build errors: drivers/iio/magnetometer/ak8975.c: In function 'ak8975_who_i_am': drivers/iio/magnetometer/ak8975.c:393:2: error: implicit declaration of function 'i2c_smbus_read_i2c_block_data' [-Werror=implicit-function-declaration] ret = i2c_smbus_read_i2c_block_data(client, AK09912_REG_WIA1, ^ drivers/iio/magnetometer/ak8975.c: In function 'ak8975_set_mode': drivers/iio/magnetometer/ak8975.c:431:2: error: implicit declaration of function 'i2c_smbus_write_byte_data' [-Werror=implicit-function-declaration] ret = i2c_smbus_write_byte_data(data->client, Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> Fixes: 57e73a423b1e85 ("iio: ak8975: add ak09911 and ak09912 support") --- I found this recent regression doing ARM randconfig builds, please apply diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig index 4c7a4c52dd06..a5d6de72c523 100644 --- a/drivers/iio/magnetometer/Kconfig +++ b/drivers/iio/magnetometer/Kconfig @@ -18,6 +18,8 @@ config AK8975 config AK09911 tristate "Asahi Kasei AK09911 3-axis Compass" + depends on I2C + depends on GPIOLIB select AK8975 help Deprecated: AK09911 is now supported by AK8975 driver. -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html