netdev - Re: [PATCH RFC net-next 3/4] net: stmmac: add glue layer for T-HEAD TH1520 SoC

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Message-ID: <7146ac63-f5fa-4335-9607-2cd38baca3ab@lunn.ch>
Date: Sun, 14 Jul 2024 17:56:27 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Drew Fustini <drew@...7.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jose Abreu <joabreu@...opsys.com>,
	Jisheng Zhang <jszhang@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Emil Renner Berthing <emil.renner.berthing@...onical.com>,
	Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
	Conor Dooley <conor@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH RFC net-next 3/4] net: stmmac: add glue layer for T-HEAD
 TH1520 SoC

> +static int thead_dwmac_set_txclk_dir(struct plat_stmmacenet_data *plat)
> +{
> +	struct thead_dwmac *dwmac = plat->bsp_priv;
> +	u32 txclk_dir;
> +
> +	switch (plat->mac_interface) {
> +	case PHY_INTERFACE_MODE_MII:
> +		txclk_dir = TXCLK_DIR_INPUT;
> +		break;
> +	case PHY_INTERFACE_MODE_RGMII:
> +	case PHY_INTERFACE_MODE_RGMII_ID:
> +	case PHY_INTERFACE_MODE_RGMII_TXID:
> +	case PHY_INTERFACE_MODE_RGMII_RXID:
> +		txclk_dir = TXCLK_DIR_OUTPUT;
> +		break;
> +	default:
> +		dev_err(dwmac->dev, "unsupported phy interface %d\n",
> +			plat->mac_interface);
> +		return -EINVAL;
> +	};
> +
> +	regmap_write(dwmac->apb_regmap, GMAC_TXCLK_OEN, txclk_dir);
> +
> +	return 0;

regmap_write() can fail. So it would be better to have

	return regmap_write(dwmac->apb_regmap, GMAC_TXCLK_OEN, txclk_dir);

Please consider this for all functions which a similar.

> +static void thead_dwmac_fix_speed(void *priv, unsigned int speed, unsigned int mode)
> +{
> +	struct thead_dwmac *dwmac = priv;
> +	struct plat_stmmacenet_data *plat = dwmac->plat;
> +	unsigned long rate;
> +	u32 div;

Reverse christmas tree please. You will need to move the plat
assignment into the body of the code.

> +static int thead_dwmac_probe(struct platform_device *pdev)
> +{
> +	struct plat_stmmacenet_data *plat;
> +	struct stmmac_resources stmmac_res;
> +	struct thead_dwmac *dwmac;
> +	struct device_node *np = pdev->dev.of_node;
> +	u32 delay_ps;
> +	int ret;
> +	void __iomem *apb;

np and apb should be earlier to keep with reverse christmas
tree. Please check and fix all functions.

> +
> +	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "failed to get resources\n");
> +
> +	plat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
> +	if (IS_ERR(plat))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(plat),
> +				     "dt configuration failed\n");
> +
> +	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
> +	if (!dwmac)
> +		return -ENOMEM;
> +
> +	if (!of_property_read_u32(np, "rx-internal-delay-ps", &delay_ps))
> +		dwmac->rx_delay = delay_ps;

> +#define  GMAC_RXCLK_DELAY_MASK		GENMASK(4, 0)

So this is a 5 bit value. You should perform a range check. So, do you
need to do some sort of conversion from picoseconds to register value?

> +MODULE_AUTHOR("T-HEAD");

Authors are people.

> +MODULE_AUTHOR("Jisheng Zhang <jszhang@...nel.org>");
> +MODULE_DESCRIPTION("T-HEAD dwmac platform driver");
> +MODULE_LICENSE("GPL");


    Andrew

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