2024-02-07 02:13 AM
Hi there,
I have started looking into writing a test program/script to test the functionality of the one of the SPI bus interface (which in the current board called SPI6). Now when I looked into the kernel (the below is the STM kernel we are using at the moment):
# uname -a
Linux buildroot 5.15.67 #1 SMP PREEMPT Tue Feb 6 16:12:01 GMT 2024 armv7l GNU/Linux
I can see the following:
# ls -la /sys/bus/spi/devices/spi0.
spi0.0/ spi0.1/ spi0.2/ spi0.3/ spi0.4/
# ls -la /sys/class/spi_master/spi
spi0/ spi1/
# ls -la /sys/class/spi_
spi_master/ spi_slave/
# ls -la /sys/class/spi_master/
total 0
drwxr-xr-x 2 root root 0 Feb 7 08:18 .
drwxr-xr-x 58 root root 0 Feb 7 08:18 ..
lrwxrwxrwx 1 root root 0 Feb 7 10:01 spi0 -> ../../devices/platform/soc/44004000.spi/spi_master/spi0
lrwxrwxrwx 1 root root 0 Feb 7 10:01 spi1 -> ../../devices/platform/soc/5c001000.spi/spi_master/spi1
# ls -la /sys/class/spi_slave/
total 0
drwxr-xr-x 2 root root 0 Feb 7 08:18 .
drwxr-xr-x 58 root root 0 Feb 7 08:18 ..
I checked the .config file we are using and the below config options are present:
CONFIG_SPI=y
CONFIG_SPI_DEBUG=y
CONFIG_SPI_STM32=m
CONFIG_SPI_STM32_QSPI=y
CONFIG_SPI_SPIDEV=y
CONFIG_SPI_MASTER=y
I can also see the below module:
# lsmod | grep -i spi
spi_stm32 24576 0
However, I was expecting to see spi nodes under /dev which I cannot:
# ls -la /dev/spi*
ls: /dev/spi*: No such file or directory
I do not have any slave device attached to the bus yet. Can someone please suggest if there is anything I am missing here? Many thanks.
Solved! Go to Solution.
2024-02-15 04:05 AM
Hi Erwan,
Thanks for the reply. I have thankfully resolved the issue with the help from SO. Here is the link if someone is interested in future:
2024-02-14 02:51 AM
Hello @VivekB ,
What does your device trees' SPI node looks like ? Do you have spi subnodes defined ?
If you want to make some basic tests, you need to at least declare some spidev subnodes.
Please see an example here in the wiki: https://wiki.st.com/stm32mpu/wiki/How_to_use_SPI_from_Linux_userland_with_spidev#DT_and_kernel_configuration
Kind regards,
Erwan.
2024-02-15 04:05 AM
Hi Erwan,
Thanks for the reply. I have thankfully resolved the issue with the help from SO. Here is the link if someone is interested in future: