3-Wire SPI support on iMX6 (Linux)

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3-Wire SPI support on iMX6 (Linux)

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erezsteinberg
Contributor IV

Hello experts,

I am connecting a peripheral to an iMX6S over a 3-Wire SPI interface (shared MOSI/MISO).

Do anyone know if SPI_3WIRE option is supported in iMX6 Linux SPI Driver?

If so, should we tie MOSI and MISO together via 10K resistors?

Regards,

Erez

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igorpadykov
NXP Employee
NXP Employee

Hi Erez

no it is not supported.

Actually it is not difficult to realize it as spi bit bang.

Best regards

igor

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igorpadykov
NXP Employee
NXP Employee

Hi Erez

no it is not supported.

Actually it is not difficult to realize it as spi bit bang.

Best regards

igor

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jamesdeepu
Contributor II

Dear Igor,

Is bitbanging required only if MOSI and MISO not connected via resistor ?

My SPI connection is shown below

pastedImage_0.png

Here SDO is connected to SDI via resistor on Slave side. Will that work out?.

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erezsteinberg
Contributor IV

Thanks Igor,

Just to clarify, the support is missing in the Linux driver implementation. It's not a h/w limitation...

(Bit-banging was my backup plan, so i'm not concerned about this too much).

Regards,

Erez

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