Re: can, tcan4x5x: look to merge rpi support into rpi kernel tree

Marc Kleine-Budde
2021-02-26T13:40:21Z

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On 26.02.2021 13:26:20, Torin Cooper-Bennun wrote:
> On Fri, Feb 26, 2021 at 01:40:35PM +0100, Marc Kleine-Budde wrote:
> > I think you cannot do (synchronous) SPI from NAPI (which is SoftIRQ context).
>
> I see. I now understand why you recommend using mcp251xfd as a template
> for m_can.
>
> Am I correct in saying that rx-offload requires RX timestamps to be
> available?

Proper timestamps for RX and TX would be best, but you can use
can_rx_offload_queue_tail() if you don't have any timestamps.

> They can be enabled in M_CAN, but the v3.3 manual states that
> the internal timestamp generation (apparently only option for tcan4x5x)
> cannot be used for CAN-FD.

Can you give me a reference to this?

regards,
Marc

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