Subject: Re: [PATCH net-next v9 0/4] net: stmmac: Add PCI driver support for BCM8958x

From: "Russell King (Oracle)" <[email-masked]>
Date: Tue, 7 Apr 2026 08:24:50 +0100

On Thu, Apr 02, 2026 at 02:36:25PM -0700, Jitendra Vegiraju wrote:
> From: Jitendra Vegiraju <[email-masked]>
> 
> This patchset adds basic PCI ethernet device driver support for Broadcom
> BCM8958x Automotive Ethernet switch SoC devices.
> 
> This SoC device has PCIe ethernet MAC attached to an integrated ethernet
> switch using XGMII interface. The PCIe ethernet controller is presented to
> the Linux host as PCI network device.
> Management of integrated ethernet switch on this SoC is not handled via
> the PCIe interface.
> 
> The following block diagram gives an overview of the application.
>              +=================================+
>              |       Host CPU/Linux            |
>              +=================================+
>                         || PCIe
>                         ||
>         +==========================================+
>         |           +--------------+               |
>         |           | PCIE Endpoint|               |
>         |           | Ethernet     |               |
>         |           | Controller   |               |
>         |           |   DMA        |               |
>         |           +--------------+               |
>         |           |   MAC        |   BCM8958X    |
>         |           +--------------+   SoC         |
>         |               || XGMII                   |
>         |               ||                         |
>         |           +--------------+               |
>         |           | Ethernet     |               |
>         |           | switch       |               |
>         |           +--------------+               |
>         |             || || || ||                  |
>         +==========================================+
>                       || || || || More external interfaces
> 
> The MAC block on BCM8958x is based on Synopsis XGMAC 4.00a core. This
> MAC IP introduces new DMA architecture called Hyper-DMA for virtualization
> scalability.
> 
> Driver functionality specific to new MAC (DW25GMAC) is implemented in
> new file dw25gmac.c.

Sorry for suggesting this rather late, but I recently came across
another stmmac driver in the kernel - drivers/net/ethernet/synopsys.
This is for XLGMAC, but I wonder whether it may be a better bet for
this core. Have you looked at it?

-- 
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