We are using Ethernet: ENC424J600-I/PT, SPI interface hardware component.
In an up-to-date Linux kernel source tree, I ran: git log -- drivers/net/ethernet/microchip/encx24j600.c and found that the file was introduced in commit 04fbfce7a222327b97ca165294ef19f0faa45960. I then ran git describe 04fbfce7a222327b97ca165294ef19f0faa45960 and it returned v4.3-rc3-829-g04fbfce7a222 which indicates that the driver first appeared in the kernel in 4.3. The kernel we use on WP77 is based on the 3.18.y series. So this means that our kernel does not include this driver. This means that you will have to backport this driver if you want to use it with the WP77.
I suggest copying these files out of a current kernel source tree and creating a Legato mdef file and trying to build the driver as part of your Legato system:
drivers/net/ethernet/microchip/encx24j600.c
drivers/net/ethernet/microchip/encx24j600-regmap.c
drivers/net/ethernet/microchip/encx24j600_hw.h
It’s likely that the compilation will fail due to changes in various parts of the kernel between 3.18 and the current kernel. Eventually you should be able to work through all of the items and have a working driver. Even once you get to that point, you still need to inform the kernel that the chip exists on your board by calling spi_new_device(...).
Thank you dfrey for your information. We tried using the source file and built the kernel using Legato Mdef . But the call spi_register_device() fails everytime and not identifying the device attached. We are using 3.18.44 version of kernel. Kindly suggest