netdev - Re: [PATCH net-next v5 6/6] net: dsa: mv88e6xxx: fully support SERDES on Topaz family

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Message-ID: <20190826180501.GB27244@t480s.localdomain>
Date:   Mon, 26 Aug 2019 18:05:01 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     Marek Behún <marek.behun@....cz>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Marek Behún <marek.behun@....cz>
Subject: Re: [PATCH net-next v5 6/6] net: dsa: mv88e6xxx: fully support SERDES
 on Topaz family

Hi Marek,

On Mon, 26 Aug 2019 23:31:55 +0200, Marek Behún <marek.behun@....cz> wrote:
> Currently we support SERDES on the Topaz family in a limited way: no
> IRQs and the cmode is not writable, thus the mode is determined by
> strapping pins.
> 
> Marvell's examples though show how to make cmode writable on port 5 and
> support SGMII autonegotiation. It is done by writing hidden registers,
> for which we already have code.
> 
> This patch adds support for making the cmode for the SERDES port
> writable on the Topaz family, via a new chip operation,
> .port_set_cmode_writable, which is called from mv88e6xxx_port_setup_mac
> just before .port_set_cmode.
> 
> SERDES IRQs are also enabled for Topaz.
> 
> Tested on Turris Mox.
> 
> Signed-off-by: Marek Behún <marek.behun@....cz>

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

Ho this is much clearer now, I realize I got confused by the previous version
of this patch...

As we've seen, .port_set_cmode is only called from mv88e6xxx_port_setup_mac and
.phylink_config_mac, so it is fine to keep this "make writable" code private
to the mv88e6341_port_set_cmode implementation. I will send a follow-up
patch which addresses that and removes the .port_set_cmode_writable operation.


Thank you,

	Vivien