netdev - Re: [PATCH net-next 00/15] net: dsa: add support for MT7988

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Date:   Fri, 31 Mar 2023 08:27:43 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux@...linux.org.uk,
        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: Re: [PATCH net-next 00/15] net: dsa: add support for MT7988

On 30.03.2023 18:19, Daniel Golle wrote:
> 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.

MT7623NI does not come with the MT7530 switch. MT7623AI does.

It's not an MT7530-like switch, it's the MT7530 switch, which is part of 
the multi-chip module, in a chip-stack package.

To be more specific, it's only the MT7621AT, MT7621DAT, and MT7621ST 
SoCs. MT7621NT SoC don't have it.

> 
> Split-off the part of the driver registering an MDIO driver, then add
> another module acting as MMIO/platform driver.
> 
> The whole series has been tested on various MediaTek boards:
>   * MT7623A + MT7530 (BPi-R2)

BPI-R2 has MT7623NI SoC, not MT7623AI. The MT7530 switch in this device 
is standalone.

Arınç