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

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Date:   Fri, 23 Oct 2020 14:14:09 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Marek Vasut <marex@...x.de>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        linux-kernel@...r.kernel.org, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, kernel@...gutronix.de,
        David Jander <david@...tonic.nl>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [RFC PATCH v1 0/6] add initial CAN PHY support

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

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |



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