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Mapping linux driver to GPIO

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Hi All,

I have currently mapped two GPIO to be used with slave devices to operate with I2C. I also have checked the mapped GPIO by writing 1/0 through command like and checking the signal through an oscilloscope.

I would like to map the I2C driver already there in the kernel to be used with these two GPIO pins.

Question:

1. How do I map the linux kernel I2C driver to GPIO so that I can communicate with the slave devices.

2. There are 4 i2c commands: i2cdetect, i2cdump, i2cget, i2cset. Is there any documentation on how to use them?

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    Hi yathindra,

    Using the I2C driver is going to make your life a lot easier since the interface details of I2C get abstracted way by this driver making it much simpler to write your user space application.  You won't need to perform MMAP operation and hassle with the timing of GPIO to implement I2C if you simply use one of the I2C controllers (either PS I2C or PL AXI IIC) and the corresponding driver.

    We have an example of how to use PL I2C from Linux and you can download this "Wind River Pulsar Linux OS with I2C Peripheral Integration" tutorial from the reference designs page:

    http://microzed.org/support/design/13591/116

    This will involve making sure that the appropriate I2C driver is built into the kernel, there is a valid device tree entry for the I2C controller instance, and that the userspace application is accessing the I2C driver correctly.

    Regards,

    -Kevin

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  • 0

    Hi yathindra,

    Using the I2C driver is going to make your life a lot easier since the interface details of I2C get abstracted way by this driver making it much simpler to write your user space application.  You won't need to perform MMAP operation and hassle with the timing of GPIO to implement I2C if you simply use one of the I2C controllers (either PS I2C or PL AXI IIC) and the corresponding driver.

    We have an example of how to use PL I2C from Linux and you can download this "Wind River Pulsar Linux OS with I2C Peripheral Integration" tutorial from the reference designs page:

    http://microzed.org/support/design/13591/116

    This will involve making sure that the appropriate I2C driver is built into the kernel, there is a valid device tree entry for the I2C controller instance, and that the userspace application is accessing the I2C driver correctly.

    Regards,

    -Kevin

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