Feature Request: updates and additional dto for mcp251x SPI CAN driver

[jobafr]

Feature Description

Hi,

thank you so much for this project! We'd like to use the linux-rockchip kernel with an mcp2515 CAN adapter connected to our Radxa Rock 5b on the spi0-m2-cs0 interface.

We'd like to use an up-to-date kernel as well, because there have been some nasty bugs in the old kernel version we got from Radxa's original Ubuntu 20.04 image. Your kernel has most of what we need, except for

• the rk3588-spi0-m2-cs0-mcp2515-8mhz device tree overlay (this configuration is officially supported according to Radxa's pinout, but the dts file was added to their kernel at some later point at our request, so it probably wasn't in whatever version you pulled in here).
• the latest bugfix to mcp251x in the upstream kernel

Would it be possible to pull these in here?

Side note, is it possible to build the kernel without cleaning the entire build directory? I've been using

sudo ./build.sh -ko --board=rock-5b -v -s jammy

so far and it takes ages. (I did change the kernel branch in config/suites/jammy.sh to noble so I can use the newest kernel on 22.04, which seems to work fine).