netdev - [PATCH RFC net-next 0/7] net: dsa: mt7530: updates for phylink changes

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Message-ID: <YfwRN2ObqFbrw/fF@shell.armlinux.org.uk>
Date:   Thu, 3 Feb 2022 17:30:31 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     DENG Qingfang <dqfext@...il.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH RFC net-next 0/7] net: dsa: mt7530: updates for phylink
 changes

Hi,

This series is a partial conversion of the mt7530 DSA driver to the
modern phylink infrastructure. This driver has some exceptional cases
which prevent - at the moment - its full conversion (particularly with
the Autoneg bit) to using phylink_generic_validate().

What stands in the way is this if() condition in
mt753x_phylink_validate():

	if (state->interface != PHY_INTERFACE_MODE_TRGMII ||
	    !phy_interface_mode_is_8023z(state->interface)) {

reduces to being always true. I highlight this here for the attention
of the driver maintainers.

Patch 1 populates the supported_interfaces for each port

Patch 2 removes the interface checks that become unnecessary as a result
of patch 1.

Patch 3 removes use of phylink_helper_basex_speed() which is no longer
required by phylink.

Patch 4 becomes possible after patch 3, only indicating the ethtool
modes that can be supported with a particular interface mode - this
involves removing some modes and adding others as per phylink
documentation.

Patch 5 continues patch 4, as RGMII can support 1000base-X ethtool link
mode with an appropriate external PHY.

Patch 6 switches the driver to use phylink_get_linkmodes(), which moves
the driver as close as we can to phylink_generic_validate() due to the
Autoneg bit issue mentioned above.

Patch 7 marks the driver as non-legacy.

 drivers/net/dsa/mt7530.c | 166 ++++++++++++++++-------------------------------
 drivers/net/dsa/mt7530.h |   5 +-
 2 files changed, 58 insertions(+), 113 deletions(-)

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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