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

[Andrew Lunn]

> +	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...

>  	/* 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.

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

   Andrew