Dear all,
We are trying to use the JESD204B driver in PetaLinux 2017.4 and we have a question regarding the driver setup.
The driver seems to be activated by default in the kernel, as you can see in the attached screenshot of “petalinux-device-drivers-misc”.
We have updated the device tree, so that we have the correct versions of the drivers, according to the Linux kernel being used in Petalinux 2017.4 (Kernel 4.9). In the auto-generated device tree (pl.dtsi) we have as default a version number which is not supported by the driver, so we have updated the version numbers.
-See attached device tree files system-user.dtsi and pl.dtsi
-We have configured the versions “jesd204-5.1” and “jesd204-phy-2.0”
j204bIf_jesd204_TX: jesd204@b0003000 {
compatible = "xlnx,jesd204-5.1";
}
j204bIf_jesd204_phy_0: jesd204_phy@b0000000 {
compatible = "xlnx,jesd204-phy-2.0";
}
After this setup, we expect that we can access the device properties using “sysfs”, as it is explained here: www.wiki.xilinx.com/jesd204b
Example from website:
/ # cat /sys/devices/platform/axi@0/44a00000.jesd_Rx/lane0_syncstat
NOT_IN_TAB: 0, DISPARITY: 2, UNEXPECTED_K: 0
But we do not visualize any of the device properties (lane info, etc) when we look for the device in the file system:
root@petalinux-project-2017:/sys/devices/platform/amba_pl@0/b0003000.jesd204# ls -al
total 0
drwxr-xr-x 3 root root 0 Nov 30 04:26 .
drwxr-xr-x 13 root root 0 Nov 30 04:26 ..
-rw-r--r-- 1 root root 4096 Nov 30 04:29 driver_override
-r--r--r-- 1 root root 4096 Nov 30 04:29 modalias
lrwxrwxrwx 1 root root 0 Nov 30 04:29 of_node -> ../../../../firmware/devicetree/base/amba_pl@0/jesd204@b0003000
drwxr-xr-x 2 root root 0 Nov 30 04:29 power
lrwxrwxrwx 1 root root 0 Nov 30 04:29 subsystem -> ../../../../bus/platform
-rw-r--r-- 1 root root 4096 Nov 30 04:26 uevent
In the bootup of Linux, I do not see any message which indicates that the JESD driver has been probed. See attached file boot.log. So I am not sure if the driver is active.
Are we missing something in the setup of the JESD204B driver?
Thank you very much,
Gustavo
References:
JESD204B Driver: www.wiki.xilinx.com/jesd204b
Driver code: https://github.com/Xilinx/linux-xlnx/tree/master/drivers/misc/jesd204b
Device tree bindings: https://github.com/Xilinx/linux-xlnx/tree/master/Documentation/devicetree/bindings/misc
