I2C concept

[Tirtha Ghosh]

Hi,

Same bus driver(+ or - algo driver) can be used for multiple device
controllers if they are identical in architecture as well as in algorithm.

So, ID may decide the BASE register address for the device controllers
within same bus driver.
i2c_register_board_info() will tell the bus driver that i2c chip is
connected with which controller and accordingly bus driver will communicate
with that controller.

So, two different i2c chip can be connected to same or different controller
(and hence different SDA & SCL lines) but using same bus driver.

Your GPIO lines must be muxed with controller lines. Other wise you can use
bitbanging driver also.

regards,
Tirtha


On Thu, Feb 17, 2011 at 1:36 PM, manikanta <manikanta4u at gmail.com> wrote:

> i2c_register_board_info- first parameter defines the bus number
> and this should match with the id for the device (which is resident
> on the I2C bus) while registering in board initialization files.
>
> AFAIK this bus number is basically an identifer to distinguish between
> different I2C bus drivers.Am i right??
>
> If yes then in our platform we have only one I2C bus driver then why do
> we have to give different bus numbers??
>
> Our devices are connected to different SDA and SCL lines(gpios basically)
> and
> for which we are using different bus numbers but we have common I2C driver.
> So why different bus numbers???
>
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