linux-kernel - [RFC PATCH net-next v2 0/2] net: dsa: add support for MT7988

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Message-ID: <cover.1680041193.git.daniel@makrotopia.org>
Date:   Tue, 28 Mar 2023 23:16:17 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Sam Shih <Sam.Shih@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>
Subject: [RFC PATCH net-next v2 0/2] net: dsa: add support for MT7988

The MediaTek MT7988 SoC comes with a built-in switch very similar to
previous MT7530 and MT7531. However, the switch address space is mapped
into the SoCs memory space rather than being connected via MDIO.
Using MMIO simplifies register access and also removes the need for a bus
lock, and for that reason also makes interrupt handling more light-weight.

Note that this is different from previous SoCs like MT7621 and MT7623N
which also came with an integrated MT7530-like switch which yet had to be
accessed via MDIO.

Split-off the part of the driver registering an MDIO driver, then add
another module acting as MMIO/platform driver.

Changes since initial RFC:
 * use regmap for register access and move register access to bus-
   specific driver
 * move initialization of MT7531 SGMII PCS to MDIO driver

Daniel Golle (2):
  net: dsa: mt7530: split-off MDIO driver
  net: dsa: mt7530: introduce MMIO driver for MT7988 SoC

 drivers/net/dsa/Kconfig       |  16 +-
 drivers/net/dsa/Makefile      |   4 +-
 drivers/net/dsa/mt7530-mdio.c | 309 ++++++++++++++++++++++
 drivers/net/dsa/mt7530-mmio.c | 143 ++++++++++
 drivers/net/dsa/mt7530.c      | 479 ++++++++++++++--------------------
 drivers/net/dsa/mt7530.h      |  38 +--
 6 files changed, 686 insertions(+), 303 deletions(-)
 create mode 100644 drivers/net/dsa/mt7530-mdio.c
 create mode 100644 drivers/net/dsa/mt7530-mmio.c

-- 
2.39.2