linux-kernel - Re: [net-next RFC PATCH 0/4] net: dsa: Add Airoha AN8855 support

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Message-ID: <67165992.df0a0220.170dc.b117@mx.google.com>
Date: Mon, 21 Oct 2024 15:39:26 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Arınç ÜNAL <arinc.unal@...nc9.com>,
	Daniel Golle <daniel@...rotopia.org>,
	DENG Qingfang <dqfext@...il.com>,
	Sean Wang <sean.wang@...iatek.com>, Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next RFC PATCH 0/4] net: dsa: Add Airoha AN8855 support

On Mon, Oct 21, 2024 at 04:36:05PM +0300, Vladimir Oltean wrote:
> On Mon, Oct 21, 2024 at 03:01:55PM +0200, Christian Marangi wrote:
> > It's conceptually similar to mediatek switch but register and bits
> > are different.
> 
> Is it impractical to use struct regmap_field to abstract those
> differences away and reuse the mt7530 driver's control flow? What is the
> relationship between the Airoha and Mediatek IP anyway? The mt7530
> maintainers should also be consulted w.r.t. whether code sharing is in
> the common interest (I copied them).

Some logic are similar for ATU or VLAN handling but then they added bits
in the middle of the register and moved some in other place.

Happy of being contradicted but from what I checked adapting the mtk
code would introduce lots of condition and wrapper and I feel it would
be actually worse than keeping the 2 codebase alone.

Would love some help by mt7530 to catch some very common case.

-- 
	Ansuel