Re: [PATCH v3 2/4] net: stmmac: dwc-qos: Add FSD EQoS support

[Andrew Lunn <andrew@xxxxxxx>]

> +static const int rx_clock_skew_val[] = {0x2, 0x0};

> +static int dwc_eqos_setup_rxclock(struct platform_device *pdev, int ins_num)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct regmap *syscon;
> +	unsigned int reg;
> +
> +	if (np && of_property_read_bool(np, "fsd-rx-clock-skew")) {
> +		syscon = syscon_regmap_lookup_by_phandle_args(np,
> +							      "fsd-rx-clock-skew",
> +							      1, &reg);
> +		if (IS_ERR(syscon)) {
> +			dev_err(&pdev->dev,
> +				"couldn't get the rx-clock-skew syscon!\n");
> +			return PTR_ERR(syscon);
> +		}
> +
> +		regmap_write(syscon, reg, rx_clock_skew_val[ins_num]);

Please could you explain what this is doing.

       Andrew