Re: [PATCH v3 2/2] ethernet: eswin: Add eic7700 ethernet driver

["Russell King (Oracle)" <linux@armlinux.org.uk>]

On Thu, Jul 03, 2025 at 05:20:15PM +0800, weishangjuan@eswincomputing.com wrote:
> +static void eic7700_qos_fix_speed(void *priv, int speed, u32 mode)
> +{
> +	struct eic7700_qos_priv *dwc_priv = priv;
> +	int i;
> +
> +	switch (speed) {
> +	case SPEED_1000:
> +		for (i = 0; i < 3; i++)
> +			regmap_write(dwc_priv->hsp_regmap,
> +				     dwc_priv->dly_hsp_reg[i],
> +				     dwc_priv->dly_param_1000m[i]);
> +		break;
> +	case SPEED_100:
> +		for (i = 0; i < 3; i++) {
> +			regmap_write(dwc_priv->hsp_regmap,
> +				     dwc_priv->dly_hsp_reg[i],
> +				     dwc_priv->dly_param_100m[i]);
> +		}

The other two instances don't have the curley braces, why does this need
it?

> +		break;
> +	case SPEED_10:
> +		for (i = 0; i < 3; i++) {
> +			regmap_write(dwc_priv->hsp_regmap,
> +				     dwc_priv->dly_hsp_reg[i],
> +				     dwc_priv->dly_param_10m[i]);
> +		}
> +		break;
> +	default:
> +		dev_err(dwc_priv->dev, "invalid speed %u\n", speed);
> +		break;
> +	}

Overall, wouldn't:

	const u32 *dly_param;

	switch (speed) {
	case SPEED_1000:
		dly_param = dwc_priv->dly_param_1000m;
		break;
	... etc ...
	default:
		dly_param = NULL;
		dev_err(dwc_priv->dev, "invalid speed %u\n", speed);
		break;
	}

	if (dly_param)
		for (i = 0; i < 3; i++)
			regmap_write(dwc_priv->hsp_regmap,
				     dwc_priv->dly_hsp_reg[i],
				     dly_param[i]);

be more concise and easier to read?

> +}
> +
> +static int eic7700_dwmac_probe(struct platform_device *pdev)
> +{
> +	struct plat_stmmacenet_data *plat_dat;
> +	struct stmmac_resources stmmac_res;
> +	struct eic7700_qos_priv *dwc_priv;
> +	u32 hsp_aclk_ctrl_offset;
> +	u32 hsp_aclk_ctrl_regset;
> +	u32 hsp_cfg_ctrl_offset;
> +	u32 eth_axi_lp_ctrl_offset;
> +	u32 eth_phy_ctrl_offset;
> +	u32 eth_phy_ctrl_regset;
> +	bool has_rx_dly = false;
> +	bool has_tx_dly = false;
> +	int ret;
> +
> +	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				"failed to get resources\n");
> +
> +	plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
> +	if (IS_ERR(plat_dat))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
> +				"dt configuration failed\n");
> +
> +	dwc_priv = devm_kzalloc(&pdev->dev, sizeof(*dwc_priv), GFP_KERNEL);
> +	if (!dwc_priv)
> +		return -ENOMEM;
> +
> +	dwc_priv->dev = &pdev->dev;
> +	dwc_priv->dly_param_1000m[0] = EIC7700_DELAY_VALUE0;
> +	dwc_priv->dly_param_1000m[1] = EIC7700_DELAY_VALUE1;
> +	dwc_priv->dly_param_1000m[2] = EIC7700_DELAY_VALUE0;
> +	dwc_priv->dly_param_100m[0] = EIC7700_DELAY_VALUE0;
> +	dwc_priv->dly_param_100m[1] = EIC7700_DELAY_VALUE1;
> +	dwc_priv->dly_param_100m[2] = EIC7700_DELAY_VALUE0;
> +	dwc_priv->dly_param_10m[0] = 0x0;
> +	dwc_priv->dly_param_10m[1] = 0x0;
> +	dwc_priv->dly_param_10m[2] = 0x0;
> +
> +	ret = of_property_read_u32(pdev->dev.of_node, "rx-internal-delay-ps",
> +				   &dwc_priv->rx_delay_ps);
> +	if (ret)
> +		dev_dbg(&pdev->dev, "can't get rx-internal-delay-ps, ret(%d).", ret);

Consider using %pe and ERR_PTR(ret) so that error codes can be
translated to human readable strings. Ditto elsewhere.

> +	else
> +		has_rx_dly = true;
> +
> +	ret = of_property_read_u32(pdev->dev.of_node, "tx-internal-delay-ps",
> +				   &dwc_priv->tx_delay_ps);
> +	if (ret)
> +		dev_dbg(&pdev->dev, "can't get tx-internal-delay-ps, ret(%d).", ret);
> +	else
> +		has_tx_dly = true;
> +	if (has_rx_dly && has_tx_dly) {
> +		eic7700_set_delay(dwc_priv->rx_delay_ps, dwc_priv->tx_delay_ps,
> +				  &dwc_priv->dly_param_1000m[1]);
> +		eic7700_set_delay(dwc_priv->rx_delay_ps, dwc_priv->tx_delay_ps,
> +				  &dwc_priv->dly_param_100m[1]);
> +		eic7700_set_delay(dwc_priv->rx_delay_ps, dwc_priv->tx_delay_ps,
> +				  &dwc_priv->dly_param_10m[1]);
> +	} else {
> +		dev_dbg(&pdev->dev, " use default dly\n");
> +	}
> +
> +	ret = of_property_read_variable_u32_array(pdev->dev.of_node, "eswin,dly_hsp_reg",
> +						  &dwc_priv->dly_hsp_reg[0], 3, 0);
> +	if (ret != 3) {
> +		dev_err(&pdev->dev, "can't get delay hsp reg.ret(%d)\n", ret);
> +		return ret;
> +	}
> +
> +	dwc_priv->crg_regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
> +							       "eswin,syscrg_csr");
> +	if (IS_ERR(dwc_priv->crg_regmap))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(dwc_priv->crg_regmap),
> +				"Failed to get syscrg_csr regmap\n");
> +
> +	ret = of_property_read_u32_index(pdev->dev.of_node, "eswin,syscrg_csr", 1,
> +					 &hsp_aclk_ctrl_offset);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret, "can't get hsp_aclk_ctrl_offset\n");
> +
> +	regmap_read(dwc_priv->crg_regmap, hsp_aclk_ctrl_offset, &hsp_aclk_ctrl_regset);
> +	hsp_aclk_ctrl_regset |= (EIC7700_HSP_ACLK_CLKEN | EIC7700_HSP_ACLK_DIVSOR);
> +	regmap_write(dwc_priv->crg_regmap, hsp_aclk_ctrl_offset, hsp_aclk_ctrl_regset);
> +
> +	ret = of_property_read_u32_index(pdev->dev.of_node, "eswin,syscrg_csr", 2,
> +					 &hsp_cfg_ctrl_offset);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret, "can't get hsp_cfg_ctrl_offset\n");
> +
> +	regmap_write(dwc_priv->crg_regmap, hsp_cfg_ctrl_offset, EIC7700_HSP_CFG_CTRL_REGSET);
> +
> +	dwc_priv->hsp_regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
> +							       "eswin,hsp_sp_csr");
> +	if (IS_ERR(dwc_priv->hsp_regmap))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(dwc_priv->hsp_regmap),
> +				"Failed to get hsp_sp_csr regmap\n");
> +
> +	ret = of_property_read_u32_index(pdev->dev.of_node, "eswin,hsp_sp_csr", 2,
> +					 &eth_phy_ctrl_offset);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret, "can't get eth_phy_ctrl_offset\n");
> +
> +	regmap_read(dwc_priv->hsp_regmap, eth_phy_ctrl_offset, &eth_phy_ctrl_regset);
> +	eth_phy_ctrl_regset |= (EIC7700_ETH_TX_CLK_SEL | EIC7700_ETH_PHY_INTF_SELI);
> +	regmap_write(dwc_priv->hsp_regmap, eth_phy_ctrl_offset, eth_phy_ctrl_regset);
> +
> +	ret = of_property_read_u32_index(pdev->dev.of_node, "eswin,hsp_sp_csr", 3,
> +					 &eth_axi_lp_ctrl_offset);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret, "can't get eth_axi_lp_ctrl_offset\n");
> +
> +	regmap_write(dwc_priv->hsp_regmap, eth_axi_lp_ctrl_offset, EIC7700_ETH_CSYSREQ_VAL);
> +

Consider more sensible wrapping of this (netdev frowns at >80
characters per line, except for message strings that should remain
greppable.)

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