linux-kernel - Re: [PATCH 1/4] stmmac: pci: Add dwmac support for Loongson

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Date:   Tue, 22 Jun 2021 10:10:26 +0800
From:   zhangqing <zhangqing@...ngson.cn>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Rob Herring <robh+dt@...nel.org>,
        Huacai Chen <chenhc@...ote.com>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        netdev@...r.kernel.org, Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: Re: [PATCH 1/4] stmmac: pci: Add dwmac support for Loongson



On 06/21/2021 10:55 AM, Andrew Lunn wrote:
>> +static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>> +{
>> +	struct plat_stmmacenet_data *plat;
>> +	struct stmmac_resources res;
>> +	int ret, i, mdio;
>> +	struct device_node *np;
>> +
>> +	np = dev_of_node(&pdev->dev);
>> +
>> +	if (!np) {
>> +		pr_info("dwmac_loongson_pci: No OF node\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	if (!of_device_is_compatible(np, "loongson, pci-gmac")) {
>> +		pr_info("dwmac_loongson_pci: Incompatible OF node\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
>> +	if (!plat)
>> +		return -ENOMEM;
>> +
>> +	if (plat->mdio_node) {
>> +		dev_err(&pdev->dev, "Found MDIO subnode\n");
> It is an error is an MDIO node is found?

Hi，Andrew

Thanks for your advice,

Using dev_ DEG () is appropriate,

and other issues I will fix in v2.

Thanks,

-Qing

>
>> +		mdio = true;
>> +	}
>> +
> ...
>
>> +
>> +	plat->phy_interface = device_get_phy_mode(&pdev->dev);
>> +	if (plat->phy_interface < 0)
>> +		dev_err(&pdev->dev, "phy_mode not found\n");
>> +
>> +	plat->interface = PHY_INTERFACE_MODE_GMII;
> Seems odd you call device_get_phy_mode() but then have this hard coded
> PHY_INTERFACE_MODE_GMII?
>
> 	Andrew