topic Re: I2C RPMSG Driver in i.MX Processors

I2C RPMSG Driver

hellfire3456789 — Mon, 27 Jul 2020 00:37:03 GMT

Hi, I see in the Linux kernel there's an i2c-rpmsg-imx.c driver which uses RPMSG to manage an i2c controller that's controlled by the M4 core. Is there any source code available for the M4 side of this driver? Preferably for the imx7d but I'm happy with any other processor as well.

Re: I2C RPMSG Driver

igorpadykov — Mon, 27 Jul 2020 03:34:09 GMT

Hi Nick

one can look at i.MX7D FreeRTOS examples in folder../driver_examples/i2c_imx/

Windows Installer: i.MX 7Dual/Solo FreeRTOS BSP for Cortex-M4

Best regards
igor
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Re: I2C RPMSG Driver

hellfire3456789 — Mon, 27 Jul 2020 07:26:58 GMT

I think you misunderstand, there's a driver in Linux that uses the RPMSG system to control the I2C bus through the M4.

There must be some sort of M4 side software required for this, I'm looking for this code. It's not the I2C side of the M4 code that I'm having trouble with, it's the RPMSG interface. This may be software for the IMX8D or IMX8Q, I see references to this driver into the device tree for those (fsl,i2c-rpbus).

Re: I2C RPMSG Driver

igorpadykov — Mon, 27 Jul 2020 10:55:02 GMT

seems i.MX8QXP, there are reference to imx_rpmsg_i2c in

imx8qxpmek CAN-FD cannot found

https://community.nxp.com/thread/530194

also one can look at RPMSG driver description in i.MX Linux Reference Manual

Best regards
igor