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

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Message-ID: <c17ce6db-4823-44cb-8fda-6ef62f4768fd@lunn.ch>
Date:   Mon, 14 Aug 2023 22:47:09 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sriranjani P <sriranjani.p@...sung.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        richardcochran@...il.com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        alim.akhtar@...sung.com, linux-fsd@...la.com,
        pankaj.dubey@...sung.com, swathi.ks@...sung.com,
        ravi.patel@...sung.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Chandrasekar R <rcsekar@...sung.com>,
        Suresh Siddha <ssiddha@...la.com>
Subject: Re: [PATCH v3 2/4] net: stmmac: dwc-qos: Add FSD EQoS support

> +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