Hi Andrew, I took a look at the xpcs driver and the stmmac driver and it doesn't cover NPCM use. in the NPCM case the stmmac ID=0x37 therefore the driver is linked to DWMAC1000 https://elixir.bootlin.com/linux/v6.7-rc2/source/drivers/net/ethernet/stmicro/stmmac/hwif.c#L139 to enable the xpcs, the stmmac should support xgmac or gmac4 and in the NPCM is support only gmac. https://elixir.bootlin.com/linux/v6.7-rc2/source/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c#L555 https://elixir.bootlin.com/linux/v6.7-rc2/source/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c#L573 and the most important thing is that the XPCS is handled through an indirect register access and not through MDIO. the MDIO is connected to the external PHY and not to the XPCS. In that case, I think the best way to handle the XPCS is through the NPCM glue layer, what do you think? Thanks, Tomer On Thu, 23 Nov 2023 at 15:50, Tomer Maimon <tmaimon77@xxxxxxxxx> wrote: > > Hi Andrew, > > On Wed, 22 Nov 2023 at 20:45, Andrew Lunn <andrew@xxxxxxx> wrote: > > > > On Wed, Nov 22, 2023 at 07:50:57PM +0200, Tomer Maimon wrote: > > > Hi Andrew, > > > > > > Thanks for your comments > > > > > > On Tue, 21 Nov 2023 at 18:42, Andrew Lunn <andrew@xxxxxxx> wrote: > > > > > > > > > +void npcm_dwmac_pcs_init(struct npcm_dwmac *dwmac, struct device *dev, > > > > > + struct plat_stmmacenet_data *plat_dat) > > > > > +{ > > > > > + u16 val; > > > > > + > > > > > + iowrite16((u16)(SR_MII_CTRL >> 9), dwmac->reg + IND_AC_BA_REG); > > > > > + val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG); > > > > > + val |= PCS_RST; > > > > > + iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG); > > > > > + > > > > > + while (val & PCS_RST) > > > > > + val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG); > > > > > + > > > > > + val &= ~(PCS_AN_ENABLE); > > > > > + iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG); > > > > > +} > > > > > > > > Is this a licensed PCS implementation? Or home grown? If its been > > > > licensed from somebody, it maybe should live in driver/net/pcs, so > > > > others can reuse it when they license the same core. > > > > > we are using DWC PCS, I don't see support for DWC PCS and I am not > > > sure it is supposed to be supported at /drivers/net/pcs > > > > I've not followed the naming used by Synopsys. Is DWC PCS the same as > > XPCS? Does Synopsys have multiple PCS implementations? > > > > > I do see a patch set to support DWC PCS but I don't think it answers my needs > > > https://patchwork.ozlabs.org/project/netdev/patch/1559674736-2190-3-git-send-email-weifeng.voon@xxxxxxxxx/ > > > > I _think_ this patch eventually got turned into > > driver/net/pcs/pcs-xpcs.c > > > > What exactly does it not do for you? > Thanks for pointing me to Synopsys (DWC) PCS in pcs-xpcs.c I need to > check if the driver follows all our SGMII needs > > > > Andrew > > Best regards, > > Tomer
