netdev - Re: [PATCH net-next 4/8] net: dsa: mv88e6xxx: Set the CMODE for mv88e6390 ports 9 & 10

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Date:   Fri, 20 Jan 2017 19:20:10 -0500
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Andrew Lunn <andrew@...n.ch>, David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next 4/8] net: dsa: mv88e6xxx: Set the CMODE for mv88e6390 ports 9 & 10

Hi Andrew,

Andrew Lunn <andrew@...n.ch> writes:

> Unlike most ports, ports 9 and 10 of the 6390X family have configurable
> PHY modes. Set the mode as part of adjust_link().
>
> Ordering is important, because the SERDES interfaces connected to
> ports 9 and 10 can be split and assigned to other ports. The CMODE has
> to be correctly set before the SERDES interface on another port can be
> configured. Such configuration is likely to be performed in
> port_enable() and port_disabled(), called on slave_open() and
> slave_close().
>
> The simple case is port 9 and 10 are used for 'CPU' or 'DSA'. In this
> case, the CMODE is set via a phy-mode in dsa_cpu_dsa_setup(), which is
> called early in the switch setup.
>
> When ports 9 or 10 are used as user ports, and have a fixed-phy, when
> the fixed fixed-phy is attached, dsa_slave_adjust_link() is called,
> which results in the adjust_link function being called, setting the
> cmode. The port_enable() will for other ports will be called much
> later.
>
> When ports 9 or 10 are used as user ports and have a real phy attached
> which does not use all the available SERDES interface, e.g. a 1Gbps
> SGMII, there is currently no mechanism in place to set the CMODE of
> the port from software. It must be hoped the stripping resistors are
> correct.
>
> At the same time, add a function to get the cmode. This will be needed
> when configuring the SERDES interfaces.
>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>

Reviewed-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>

Thanks for the very descriptive message, the patch looks perfect.

        Vivien