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Date: Sat, 16 Dec 2023 19:08:22 +0000
From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Jie Luo <quic_luoj@quicinc.com>, davem@davemloft.net,
	edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
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	netdev@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH v8 14/14] dt-bindings: net: ar803x: add qca8084 PHY
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Sender: Russell King (Oracle) <linux@armlinux.org.uk>

On Sat, Dec 16, 2023 at 06:30:00PM +0100, Andrew Lunn wrote:
> > The following is the chip package, the chip can work on the switch mode
> > like the existed upstream code qca8k, where PHY1-PHY4 is connected with
> > MAC1-MAC4 directly; The chip can also work on the PHY mode, where PHY1-
> > PHY4 is connected with PCS1 by 10g-qxgmii; Either switch mode or PHY mode,
> > the PHY4 is optionally connected with PCS0 by SGMII, PCS0 and PCS1
> > are connected with the SoC(IPQ platform) PCSes.
> 
> I don't really understand. Are you saying the hardware is actually :
> 
> 
> +----------------------------------------------+
> |          PCS1           PCS0                 |
> |                                              |
> |          MAC0           MAC5                 |
> |           |              |                   |
> |     +-----+--------------+-------------+     |
> |     |                                  |     |
> |     |                Switch            |     |
> |     |                                  |     |
> |     +-+---------+---------+---------+--+     |
> |       |         |         |         |        |
> |      MAC1      MAC2      MAC3      MAC4      |
> |                                              |
> |      PHY1      PHY2      PHY3      PHY4      |
> +----------------------------------------------+
> 
> When in PHY mode, the switch is hard coded to map the 4 PCS1 channels
> straight to MAC1-MAC4 and all switch functionality is disabled. But
> then in switch mode, the switch can be controlled as a DSA switch? The
> 10G PCS1 is then a single 10G port, not 4x 2.5G?
> 
> Is there a product brief for this PHY? That might help us understand
> this hardware?

Not even digikey give any clues what "QCA8084" is - they list it as
"unclassified" and give no documentation and no photo. Basically it
seems to be a super secret device.

-- 
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