Hi Thanassis,
On 08/13/2013 11:03 AM, Thanassis Silis wrote:
Hello everyone,
I am unaware as to who sets clock speed on the i2c bus and specifically
on the /dev/i2c-2 which is exposed on the board so as to drive external
equipment.
>
I am looking into the linux-boundary kernel files in yocto (dylan) build
dir, but I cannot figure out where that is set.
To be honest I don't even know if i'll find that info there, but it
seems like the right place to start (after googling about it of course).
So who determined the speed (standard mode, fast mode, etc) for the
external i2c? if it is a driver , which one should I be looking for?
This structure defines the speed of the I2C bus:
https://github.com/boundarydevices/linux-imx6/blob/boundary-imx_3.0.35_4.0.0/arch/arm/mach-mx6/board-mx6_nitrogen6x.c#L434
To change it for i2c-2 by itself, you'll need to make a copy of
that, change the speed value and pass the copy to the routine
imx6q_add_imx_i2c():
https://github.com/boundarydevices/linux-imx6/blob/boundary-imx_3.0.35_4.0.0/arch/arm/mach-mx6/board-mx6_nitrogen6x.c#L1320
The reason is I am trying to drive some TMC222 low-power stepper motor
control ICs, but they do not respond.
Note I have successfully connected a number of other i2c ICs (among
others the pca9505x).
An answer is not necessary. Any pointers as to how to go about it , so I
can learn about this is more than welcome.
Thank you for your help.
This should be straightforward.
Let me know if you have any trouble.
Regards,
Eric
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