一：加载i2c driver
kmod-i2c-core................................................ I2C support
kmod-i2c-algo-bit............................. I2C bit-banging interfaces
kmod-i2c-algo-pca................................ I2C PCA 9564 interfaces
kmod-i2c-algo-pcf................................ I2C PCF 8584 interfaces
kmod-i2c-gpio.................................. GPIO-based bitbanging I2C //这个就是模拟i2c platform device
二：加载i2c device
kmod-i2c-gpio-custom........................ Custom GPIO-based I2C device //这个就是 i2c platform driver
三：编译固件烧写到板子
四：ismod gpio口
insmod i2c-gpio-custom bus0=0,1,2
这样以后发会发现 i2c-0设备：
五：使用i2ctools测试 i2c驱动