Hi,
For S32G2 family, there is an "Ethernet Enablement Guide" that shows the steps on how to enable the different ethernet ports available on the RDB2 platform. This is available under the RDB2 product page (link: S32G2 Vehicle Networking Reference Design | NXP Semiconductors).
Given that SGMII under GMAC seems to be supported under SerDes_0 and RDB2 does not enable SerDes_0 for anything else than PCIe, there is no documentation that goes over the configuration for GMAC under SGMII.
Some steps are provided to configure "PCIe+GMAC0 SGMII on Serdes 0 and 2.5G on Serdes 1" from our internal team:
"1. hwconfig
setenv hwconfig "pcie0:mode=rc,clock=ext,fmhz=100,xpcs_mode=0;pcie1:mode=sgmii,clock=ext,fmhz=125,xpcs_mode=2G5"
2. dts for u-boot
&gmac0 {
phy-mode = "sgmii";
};
3. dts for kernel
/ethernet@4033c000{
phy-mode="sgmii";
};
As the following DTS configuration, pinctrl-0 corresponds to RGMII, pinctrl-1 corresponds to SGMII.
&gmac0 {
clocks = <&clks S32GEN1_SCMI_CLK_GMAC0_RX_SGMII>,
<&clks S32GEN1_SCMI_CLK_GMAC0_TX_SGMII>,
<&clks S32GEN1_SCMI_CLK_GMAC0_TS_SGMII>,
<&clks S32GEN1_SCMI_CLK_GMAC0_RX_RGMII>,
<&clks S32GEN1_SCMI_CLK_GMAC0_TX_RGMII>,
<&clks S32GEN1_SCMI_CLK_GMAC0_TS_RGMII>,
<&clks S32GEN1_SCMI_CLK_GMAC0_AXI>;
clock-names = "rx_sgmii", "tx_sgmii", "ts_sgmii",
"rx_rgmii", "tx_rgmii", "ts_rgmii",
"axi";
pinctrl-0 = <&pinctrl0_gmac0 &pinctrl0_gmac0_mdio>;
pinctrl-1 = <&pinctrl0_gmac0_mdio>;
pinctrl-names = "gmac_rgmii", "gmac_sgmii";
};
"
Please, let us know if this information was helpful or not.
