linux-kernel - Re: [net-next PATCH v8 3/4] net: dsa: Add Airoha AN8855 5-Port Gigabit DSA Switch driver

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Message-ID: <675029cf.df0a0220.1d1837.a877@mx.google.com>
Date: Wed, 4 Dec 2024 11:07:08 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>,
	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>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	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,
	upstream@...oha.com
Subject: Re: [net-next PATCH v8 3/4] net: dsa: Add Airoha AN8855 5-Port
 Gigabit DSA Switch driver

On Wed, Dec 04, 2024 at 10:00:41AM +0000, Russell King (Oracle) wrote:
> On Wed, Dec 04, 2024 at 10:33:33AM +0100, Christian Marangi wrote:
> > On Wed, Dec 04, 2024 at 09:24:45AM +0000, Russell King (Oracle) wrote:
> > > > Added 5000 as this is present in documentation bits but CPU can only go
> > > > up to 2.5. Should I drop it? Idea was to futureproof it since it really
> > > > seems they added these bits with the intention of having a newer switch
> > > > with more advanced ports.
> > > 
> > > Is there any mention of supporting interfaces faster than 2500BASE-X ?
> > >
> > 
> > In MAC Layer function description, they say:
> > - Support 10/100/1000/2500/5000 Mbps bit rates
> > 
> > So in theory it can support up to that speed.
> 
> Maybe the internal IP supports this but the SoC doesn't?
> 
> However, I was asking about interfaces rather than speeds - so RGMII,
> SGMII, 2500BASE-X... is there a mention of anything else?
>

I can see mention of 5g Base-R so I assume supported but in the sdk
there isn't any code to configure it/I don't have any hardware.

(and documentation is empty for anything PCS related for register, just
block diagram)

I can ask it that is expected to work tho.

-- 
	Ansuel