linux-kernel - Re: [PATCH v1 2/4] dt-bindings: net: dsa: qca,ar9331 switch documentation

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Message-ID: <3944e911-8eaf-1c57-14de-0998b3245225@pengutronix.de>
Date:   Thu, 17 Oct 2019 08:42:11 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Chris Snook <chris.snook@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        James Hogan <jhogan@...nel.org>,
        Jay Cliburn <jcliburn@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH v1 2/4] dt-bindings: net: dsa: qca,ar9331 switch
 documentation



On 16.10.19 22:23, Andrew Lunn wrote:
> On Mon, Oct 14, 2019 at 08:15:47AM +0200, Oleksij Rempel wrote:
>> Atheros AR9331 has built-in 5 port switch. The switch can be configured
>> to use all 5 or 4 ports. One of built-in PHYs can be used by first built-in
>> ethernet controller or to be used directly by the switch over second ethernet
>> controller.
> 
> Hi Oleksij
> 
> How exactly is this phy sharing controlled? I did not see anything in
> the driver. Is there a mux we need to set?

Currently it is not controlled at all, eth0 should be disabled and switch port5 enabled 
(or other way around) in devicetree. If both are enabled, it will be some how brocken.  I 
don't know how to properly implement it.
I assume, it should not be controlled by devicetree configuration and user should be able 
to do it dynamically from user space.

Ideas, suggestions?

Kind regards,
Oleksij Rempel

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