Re: [PATCH net-next v2 13/14] net: stmmac: tc956x: add TC956x/QPS615 support
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From: Maxime Chevallier <maxime.chevallier@bootlin.com>
Date: 2026-06-05 16:06:13
Also in:
bpf, linux-arm-kernel, linux-arm-msm, linux-devicetree, linux-gpio, lkml
Hi Alex, On 6/5/26 03:00, Alex Elder wrote:
From: Daniel Thompson <redacted> Toshiba TC956x is an Ethernet AVB/TSN bridge and is essentially a small and highly-specialized SoC. TC956x includes an "eMAC" subsystem that can be accessed, along with several other peripherals, via two PCIe endpoint functions. There is a main driver for the endpoint that decomposes things and creates auxiliary bus devices to model the SoC. The eMAC consists of a Designware XGMAC, XPCS and PMA. Each eMAC is supported by an MSIGEN that bridges TC956x level interrupts to PCIe MSIs. Add a driver for the eMAC/MSIGEN combination. Co-developed-by: Alex Elder <redacted> Signed-off-by: Alex Elder <redacted> Signed-off-by: Daniel Thompson <redacted> ---
[...]
quoted hunk ↗ jump to hunk
+static int tc956x_lookup_max_speed(phy_interface_t phy_interface) +{ + switch (phy_interface) { + case PHY_INTERFACE_MODE_SGMII:
The SGMII definition we use in the kernel is the Cisco SGMII de-facto standard that only supports 10/100/1000M. Some vendors use flavours with names such as HS-SGMII and such, that's basically SGMII clocked at 2.5G with aneg disabled. It kinda becomes 2500BaseX then. So all in all, we don't support 2500M on SGMII.
quoted hunk ↗ jump to hunk
+ case PHY_INTERFACE_MODE_2500BASEX: + return SPEED_2500; + + default: + return -EOPNOTSUPP; + }
Maxime