imx8mq cannot create usb interface for usb3.0 chip ft601.

[mimi05633]

I want to use a imx8mq customer board to communicate with FTDI usb3.0 chip "UMFT601A".

After I modified the local.conf with:

IMAGE_INSTALL_append = " libftdi"

and changed kernel config with:

CONFIG_USB_SERIAL=y

CONFIG_USB_SERIAL_FTDI_SIO=y

, I can see the console log as below.

[ 1.075673] usbcore: registered new interface driver ftdi_sio
[ 1.081459] usbserial: USB Serial support registered for FTDI USB Serial Device

After I plugged the ft601 chip by type C, I could see the usb was detected, but no ttyUSBx interface was created.

[ 48.274212] usb 1-1: new high-speed USB device number 2 using xhci-hcd
[ 48.528455] usb 1-1: New USB device found, idVendor=0403, idProduct=601f, bcdDevice= 0.00
[ 48.536645] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 48.543794] usb 1-1: Product: FTDI SuperSpeed-FIFO Bridge
[ 48.549208] usb 1-1: Manufacturer: FTDI
[ 48.553057] usb 1-1: SerialNumber: 000000000001

I followed to add new_id command "echo 0403 601f >/sys/bus/usb-serial/drivers/ftdi_sio/new_id", but the board detected FT2232C rather than FT601. 

[ 2418.906255] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter detected
[ 2418.957183] usb 1-1: Detected FT2232C
[ 2418.962063] ftdi_sio ttyUSB0: Unable to read latency timer: -32
[ 2418.969074] ftdi_sio ttyUSB0: Unable to write latency timer: -32
[ 2418.991628] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
[ 2419.009082] ftdi_sio 1-1:1.1: FTDI USB Serial Device converter detected
[ 2419.059718] usb 1-1: Detected FT2232C
[ 2419.064624] ftdi_sio ttyUSB1: Unable to read latency timer: -32
[ 2419.071074] ftdi_sio ttyUSB1: Unable to write latency timer: -32
[ 2419.094139] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB1

Could any one tell me what can I do?

Thank you for any help.

Minying

[weidong_sun · Accepted solution]

Hi,

  It seems that steps should be like below:

On ubuntu 18.04
(1) Getting ft60x driver source code
# cd ~/
# mkdir device-driver
# git clone https://github.com/lambdaconcept/ft60x_driver.git

(2) Exporting cross-compile tool chain from Yocto

According to chapter 4.5.12 of i.MX_Linux_Users_Guide.pdf, export cross-compile tool chain.
Then install it to path /opt

Below is what I export: fsl-imx-xwayland-glibc-x86_64-imx-image-full-aarch64-imx8mmevk-toolchain-5.4-zeus.sh

copy the file to /opt, then run :
# cd /opt
# ./fsl-imx-xwayland-glibc-x86_64-imx-image-full-aarch64-imx8mmevk-toolchain-5.4-zeus.sh

Then below is the path of toolchain: /opt/fsl-imx-xwayland/5.4-zeus/

(3) Download linux source code

# cd ~/
# mkdir linux-source
# cd linux-source
# git clone https://source.codeaurora.org/external/imx/linux-imx -b imx_5.4.47_2.2.0

(4) Compiling kernel
# cd linux-imx
# source /opt/fsl-imx-xwayland/5.4-zeus/environment-setup-aarch64-poky-linux
# export ARCH=arm64
# make imx_v8_defconfig
# make

(5) Compiling ft60x driver
--Modifying Makefile
# cd ~/device-driver/ft60x_driver
# gedit Makefile
---------------------------------
#KERNEL_VERSION:=$(shell uname -r)
#KERNEL_PATH:=/lib/modules/$(KERNEL_VERSION)/build

KERNEL_PATH:= /home/weidong/linux-source-code/L5.4.47_2.2.0/linux-imx

obj-m = ft60x.o
sdr-objs = ft60x.o

all: ft60x.ko

ft60x.ko: ft60x.c
make -C $(KERNEL_PATH) M=$(PWD) modules

clean:
make -C $(KERNEL_PATH) M=$(PWD) clean
rm -f *~
---------------------------------
Save and exit.

# make

Then we will get ft60x driver
------------

Then use "insmod" command to load the driver on your board.

Try it, please!

After loading the driver, it should be like this:

Hope the information is helpful to you.

Have a nice day!

B.R,

weidong

[mimi05633]

Hi Weidong,

Thank you for your reply. I can create interface /dev/ft60x0 now.

There is something confusing to console logs of the command "lsusb -t"

root@imx8mqevk:~# lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0403:601f Future Technology Devices International, Ltd FTDI SuperSpeed-FIFO Bridge
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@imx8mqevk:~# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=ft60x, 480M
|__ Port 1: Dev 3, If 1, Class=Vendor Specific Class, Driver=ft60x, 480M

Is the usb speed correct? I cannot understand the usb speed shows 480M instead of 5000M.
How can I test read/write between a imx8mq board and a ft601 chip? Is there some example code to support?

By the way, my yocto version is LF_L5.4.3_1.0.0.

Thank you.

Best regards,

minying