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

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Date:   Fri, 4 Nov 2022 16:25:11 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Sriranjani P <sriranjani.p@...sung.com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, mcoquelin.stm32@...il.com,
        richardcochran@...il.com, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Chandrasekar R <rcsekar@...sung.com>,
        Suresh Siddha <ssiddha@...la.com>
Subject: Re: [PATCH 2/4] net: stmmac: dwc-qos: Add FSD EQoS support

> +static int dwc_eqos_setup_rxclock(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +
> +	if (np && of_property_read_bool(np, "rx-clock-mux")) {
> +		unsigned int reg, val;
> +		struct regmap *syscon = syscon_regmap_lookup_by_phandle(np,
> +			"rx-clock-mux");
> +
> +		if (IS_ERR(syscon)) {
> +			dev_err(&pdev->dev, "couldn't get the rx-clock-mux syscon!\n");
> +			return PTR_ERR(syscon);
> +		}
> +
> +		if (of_property_read_u32_index(np, "rx-clock-mux", 1, &reg)) {
> +			dev_err(&pdev->dev, "couldn't get the rx-clock-mux reg. offset!\n");
> +			return -EINVAL;
> +		}
> +
> +		if (of_property_read_u32_index(np, "rx-clock-mux", 2, &val)) {
> +			dev_err(&pdev->dev, "couldn't get the rx-clock-mux reg. val!\n");
> +			return -EINVAL;
> +		}
> +
> +		regmap_write(syscon, reg, val);

This appears to be one of those binds which allows any magic value to
be placed into any register. That is not how DT should be used.

   Andrew