Re: [PATCH v3 2/3] net: ethernet: actions: Add Actions Semi Owl Ethernet MAC driver

Hi Florian,

On Sun, Mar 21, 2021 at 08:30:07PM -0700, Florian Fainelli wrote:

Hi Christian,

On 3/21/2021 4:29 PM, Cristian Ciocaltea wrote:

quoted

Add new driver for the Ethernet MAC used on the Actions Semi Owl
family of SoCs.

Currently this has been tested only on the Actions Semi S500 SoC
variant.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>

[snip]

Do you know the story behind this Ethernet controller? 

I just happened to get a board based on the S500 SoC, so I took this
opportunity to help improving the mainline kernel support, but other
than that I do not really know much about the hardware history.

The various
receive/transmit descriptor definitions are 99% those defined in
drivers/net/ethernet/stmmicro/stmmac/descs.h for the normal descriptor.

That's an interesting observation. I could only assume the vendor did
not want to reinvent the wheel here, but I cannot say if this is a
common design scheme or is something specific to STMicroelectronics
only.

The register layout of the MAC looks completely different from a
dwmac100 or dwmac1000 however.

Most probably this is Actions specific.. 

-- 
Florian

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