On Mon, Oct 26, 2020 at 9:22 PM Drew Fustini <drew@xxxxxxxxxxxxxxx> wrote: > > Thank you the feedback. > > I think it may be any issue with spi interface and/or chip select config. > > [ 6.812079] DEBUG mcp251xfd mcp251xfd_probe(): ENTER > [ 6.812174] mcp251xfd spi0.0: DEBUG mcp251xfd mcp251xfd_probe(): > devm_clk_get() > [ 6.812208] mcp251xfd spi0.0: DEBUG mcp251xfd mcp251xfd_probe(): > feq=0x2625a00 > [ 6.850106] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): > Failed to detect MCP251xFD (osc=0x00000000). > > This proves that the driver is getting the 40 MHz from the device tree > properties. The board does have a 40 MHz osc. > > It is the Waveshare CANFD Hat [1]. They have their own tarball for > download [2] with a mcp25xxfd driver that is copyright 2019 by Martin > Sperl <kernel@xxxxxxxxxxxxxxxx>. I'm looking at that to see why it > works and the newer, proper driver does not. > > Thanks, > Drew > > [1] https://www.waveshare.com/wiki/2-CH_CAN_FD_HAT > [2] https://www.waveshare.com/wiki/File:2-CH-CAN-FD-HAT-Demo.7z This is the overlay that the Waveshare download is using: https://gist.github.com/pdp7/784d0ba8b9648d20ab055747ec945225 It is different but I'm having trouble understanding why it works and the new overlay for the newer driver does not. -Drew
