I2C_SPEED_100K
dev->i2c_bus[0].i2c_period = I2C_SPEED_100K; /* 100 KHz */
dev->i2c_bus[1].i2c_period = I2C_SPEED_100K; /* 100 KHz */
dev->i2c_bus[2].i2c_period = I2C_SPEED_100K; /* 100kHz */