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Or show >>>> us the schematics which clearly show extra long clock lines. >>> >>> In fact, the RTL8211F's RXDLY and TXDLY signals are both pulled low, >>> just like the Banana Pi BPI-R2 Pro, so the configuration is also referenced: >>> https://elixir.bootlin.com/linux/v6.15/source/arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dts#L237 >> >> Pull low makes no difference to the 2ns RGMII delays. > > To be clear, while the RXDLY and TXDLY are hardware strapping controls > the hardware configuration of the 2ns RGMII clock delays, the realtek > driver can (and does) override this according to the phy-mode property. > Thus hardware strapping makes no difference to Linux. > > So, what we get at the RTL8211F PHY is: > > phy-mode receive clock delay transmit clock delay > "rgmii" 0ns 0ns > "rgmii-rxid" 2ns 0ns > "rgmii-txid" 0ns 2ns > "rgmii-id" 2ns 2ns > > irrespective of RXDLY / TXDLY hardware strapping. > >>> The tx_delay and rx_delay values were obtained using Rockchip's >>> automatic scanning tool: >>> https://github.com/istoreos/istoreos/blob/54746dfdb5bd34d1f281cf41d1d1620d0c3ee686/target/linux/rockchip/files/drivers/net/ethernet/stmicro/stmmac/dwmac-rk-tool.c >>> https://gitlab.com/firefly-linux/docs/-/blob/rk356x/firefly/Common/GMAC/Rockchip_Developer_Guide_Linux_GMAC_RGMII_Delayline_EN.pdf >>> https://github.com/axlrose/rkdocs/blob/main/Common/GMAC/Rockchip_Developer_Guide_Linux_GMAC_RGMII_Delayline_EN.pdf >> >> Vendors get things wrong, including this. 'rgmii' means the PCB adds >> the 2ns delay. Nearly every Rockchip board follows Rockchip broken >> vendor recommendations, and then i come along, point out how it is >> wrong, and ask for it to be fixed, before being merged to Mainline. > > Can we at least get the "tx_delay" and "rx_delay" DT properties (which > are register values) properly documented in the DT binding document? > I know from the driver code that a value of 0 means "no delay". Other > values add an unspecified delay - it is not obvious what any non-zero > value means, or what the default means. > > This would help us understand what values such as: > > tx_delay = 0x3c or 0x4f > > and > > rx_delay = 0x2f or 0x26 > > actually mean in terms of the resulting delay at the MAC. > I couldn't figure out what they actually mean empirically, see https://lore.kernel.org/linux-rockchip/96d32ce8-394b-4454-8910-a66be2813588@cherry.de/ Without Rockchip's explanation on what this actually does, I'm not sure there's something we can do on this side. Cheers, Quentin