Re: [RFC PATCH v1 0/6] add initial CAN PHY support

Marc Kleine-Budde
2020-10-23T12:14:51Z

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On 10/23/20 1:45 PM, Russell King - ARM Linux admin wrote:
> On Fri, Oct 23, 2020 at 12:56:20PM +0200, Oleksij Rempel wrote:
>> - The upcoming CAN SIC and CAN SIC XL PHYs use a different interface to
>> the CAN controller. This means the controller needs to know which type
>> of PHY is attached to configure the interface in the correct mode. Use
>> PHY link for that, too.
>
> Is this dynamic in some form?

There isn't any CAN SIC transceivers out there yet. I suspect there will be no
auto detection possible, so we would describe the type of the attached
transceiver via device tree.

In the future I can think of some devices that have a MUX and use the a classic
transceiver (CAN high-speed) for legacy deployments and CAN SIC transceivers if
connected to a "modern" CAN bus.

Someone (i.e. the user or the system integrator) has to configure the MUX to
select the correct transceiver.

Marc

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