topic IMX6ULL kernel with CP210x drivers in i.MX Processors

IMX6ULL kernel with CP210x drivers

fabio_poiatti — Thu, 11 Apr 2019 14:31:46 GMT

Hi,

I'm working on IMX6ULLEVK and I builded a BSP

Linux imx6ull14x14evk 4.14.78-imx_4.14.78_1.0.0_ga+g94da7bdc489b #1 SMP PREEMPT Tue Apr 9 11:13:11 UTC 2019 armv7l armv7l armv7l GNU/Linux

I would like to connect the EVB with a custom board via USB HOST but I need the CP 210x usb drivers

How can I add those driver to my kernel?

thanks

Fabio

Re: IMX6ULL kernel with CP210x drivers

CarlosCasillas — Thu, 11 Apr 2019 23:36:42 GMT

Hi Fabio,

If you refer to Table 8 “Supported features” of the i.MX Linux Release Notes (for L4.14.78-1.0.0_ga) it is mentioned that for USB Host mode, only MSC, HID, UVC, and USB audio classes are supported.

So, if you want to support a CP210x, it would be required adding the USB CDC class support in Host mode, and then the proper driver, which is usually provided by the chip vendor.

Hope this will be useful for you.
Best regards!
/Carlos
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Re: IMX6ULL kernel with CP210x drivers

fabio_poiatti — Fri, 12 Apr 2019 08:24:48 GMT

Thanks Carlos

I will try ... because now I'm not able to do that ...

Do you have some information or stepbystep instructions?

Fabio

Re: IMX6ULL kernel with CP210x drivers

fabio_poiatti — Fri, 12 Apr 2019 13:43:47 GMT

I found the CP210x driver included in the repository downloaded from CodeAurora Branch Sumo

Something like ..

./buildx11/tmp/work/x86_64-nativesdk-pokysdk-linux/nativesdk-linux-libc-headers/4.15.7-r0/linux-4.15.7/drivers/usb/serial/cp210x.c
./buildx11/tmp/work/cortexa7hf-neon-poky-linux-gnueabi/linux-libc-headers/4.14-r0/linux-4.14/drivers/usb/serial/cp210x.c

./buildx11/tmp/work-shared/imx6ull14x14evk/kernel-source/drivers/usb/serial/cp210x.c

So I think there is the possibility to include the driver in the final image ... but I was not able to do it.

I tried to include some definition in defconfig or local.conf .. something like

CONFIG_USB_SERIAL_CONSOLE=y

CONFIG_USB_SERIAL_GENERIC=y

CONFIG_USB_SERIAL_CP210X = y

but without any success ...

Could yuo please give me some suggestions?

Thanks