linux-kernel - Re: [PATCH 4/9] net: mdio: ipq4019: configure CMN PLL clock for ipq5332

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Message-ID: <e1fecfd7-3de1-4719-879b-fd486fdc3815@lunn.ch>
Date:   Wed, 15 Nov 2023 16:19:05 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Luo Jie <quic_luoj@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        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,
        hkallweit1@...il.com, linux@...linux.org.uk,
        robert.marko@...tura.hr, linux-arm-msm@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_srichara@...cinc.com
Subject: Re: [PATCH 4/9] net: mdio: ipq4019: configure CMN PLL clock for
 ipq5332

> +static void ipq_cmn_clock_config(struct mii_bus *bus)
> +{
> +	u32 reg_val;
> +	const char *cmn_ref_clk;
> +	struct ipq4019_mdio_data *priv = bus->priv;

Reverse christmass tree place.

> +
> +	if (priv && priv->cmn_membase) {

Can priv be NULL? Can cmn_membase be NULL?

> +		reg_val = readl(priv->cmn_membase + CMN_PLL_REFERENCE_CLOCK);
> +		reg_val &= ~(CMN_PLL_REFCLK_EXTERNAL | CMN_PLL_REFCLK_INDEX);
> +
> +		/* Select reference clock source */
> +		cmn_ref_clk = of_get_property(bus->parent->of_node, "cmn_ref_clk", NULL);
> +		if (!cmn_ref_clk) {
> +			/* Internal 48MHZ selected by default */
> +			reg_val |= FIELD_PREP(CMN_PLL_REFCLK_INDEX, 7);
> +		} else {
> +			if (!strcmp(cmn_ref_clk, "external_25MHz"))

Not strings, please use u32 values. You can then list the valid values
in the yaml file, and get te tools to verify the DT.

> +				reg_val |= (CMN_PLL_REFCLK_EXTERNAL |
> +					    FIELD_PREP(CMN_PLL_REFCLK_INDEX, 3));
> +			else if (!strcmp(cmn_ref_clk, "external_31250KHz"))
> +				reg_val |= (CMN_PLL_REFCLK_EXTERNAL |
> +					    FIELD_PREP(CMN_PLL_REFCLK_INDEX, 4));
> +			else if (!strcmp(cmn_ref_clk, "external_40MHz"))
> +				reg_val |= (CMN_PLL_REFCLK_EXTERNAL |
> +					    FIELD_PREP(CMN_PLL_REFCLK_INDEX, 6));
> +			else if (!strcmp(cmn_ref_clk, "external_48MHz"))
> +				reg_val |= (CMN_PLL_REFCLK_EXTERNAL |
> +					    FIELD_PREP(CMN_PLL_REFCLK_INDEX, 7));
> +			else if (!strcmp(cmn_ref_clk, "external_50MHz"))
> +				reg_val |= (CMN_PLL_REFCLK_EXTERNAL |
> +					    FIELD_PREP(CMN_PLL_REFCLK_INDEX, 8));
> +			else
> +				reg_val |= FIELD_PREP(CMN_PLL_REFCLK_INDEX, 7);

If the value is not valid, return -EINVAL.

   Andrew