[Linux-stm32] [net-next v1 v1 4/5] net: stmmac: starfive: Add JHB100 SGMII interface

[Minda Chen]

> 
> > +	dwmac->sgmii_rx = devm_clk_get_optional(&pdev->dev, "rx");
> > +	if (IS_ERR(dwmac->sgmii_rx))
> > +		return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->sgmii_rx),
> > +				     "error getting sgmii rx clock\n");
> > +
> 
> The SGMII clock is optional...
> 
Yes. RGMII do not have this clock. 

> >  	/* Generally, the rgmii_tx clock is provided by the internal clock,
> >  	 * which needs to match the corresponding clock frequency according
> >  	 * to different speeds. If the rgmii_tx clock is provided by the
> >  	 * external rgmii_rxin, there is no need to configure the clock
> >  	 * internally, because rgmii_rxin will be adaptively adjusted.
> >  	 */
> > -	if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))
> > -		plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
> > +	if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk")) {
> > +		if (plat_dat->phy_interface == PHY_INTERFACE_MODE_SGMII)
> > +			plat_dat->set_clk_tx_rate =
> stmmac_starfive_sgmii_set_clk_rate;
> 
> So you probably want to return an error here if it is missing.
> 
No. RGMII still using stmmac_set_clk_tx_rate

> Or you might want to look at the compatible, and make the clock mandatory for
> this device.
> 
>    Andrew

Okay I will check the rx clock whether exist .