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To:     Russell King - ARM Linux admin <linux@armlinux.org.uk>,
        Oleksij Rempel <o.rempel@pengutronix.de>
Cc:     Marek Vasut <marex@denx.de>, Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Oliver Hartkopp <socketcan@hartkopp.net>,
        linux-kernel@vger.kernel.org, linux-can@vger.kernel.org,
        netdev@vger.kernel.org, kernel@pengutronix.de,
        David Jander <david@protonic.nl>,
        Jakub Kicinski <kuba@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Heiner Kallweit <hkallweit1@gmail.com>
References: <20201023105626.6534-1-o.rempel@pengutronix.de>
 <20201023114502.GC1551@shell.armlinux.org.uk>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Subject: Re: [RFC PATCH v1 0/6] add initial CAN PHY support
Message-ID: <043b37a0-5aa4-0311-a3f4-09c61ad20671@pengutronix.de>
Date:   Fri, 23 Oct 2020 14:14:09 +0200
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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>,
 Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Marek Vasut <marex@denx.de>, Andrew Lunn <andrew@lunn.ch>,
 Florian Fainelli <f.fainelli@gmail.com>,
 Oliver Hartkopp <socketcan@hartkopp.net>, linux-kernel@vger.kernel.org,
 linux-can@vger.kernel.org, netdev@vger.kernel.org, kernel@pengutronix.de,
 David Jander <david@protonic.nl>, Jakub Kicinski <kuba@kernel.org>,
 "David S. Miller" <davem@davemloft.net>,
 Heiner Kallweit <hkallweit1@gmail.com>
Message-ID: <043b37a0-5aa4-0311-a3f4-09c61ad20671@pengutronix.de>
Subject: Re: [RFC PATCH v1 0/6] add initial CAN PHY support
References: <20201023105626.6534-1-o.rempel@pengutronix.de>
 <20201023114502.GC1551@shell.armlinux.org.uk>
In-Reply-To: <20201023114502.GC1551@shell.armlinux.org.uk>

--HWi4KEqVVA4EDJT2aoPi1tWDGagTfuvdt
Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: quoted-printable

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 t=
o
>>   the CAN controller. This means the controller needs to know which ty=
pe
>>   of PHY is attached to configure the interface in the correct mode. U=
se
>>   PHY link for that, too.
>=20
> 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 c=
lassic
transceiver (CAN high-speed) for legacy deployments and CAN SIC transceiv=
ers 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

--=20
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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