netdev - Re: [PATCH 4/4] net: stmmac: Add glue layer for Sophgo SG2044 SoC

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Message-ID: <227daa87-1924-4b0b-80db-77507fc20f19@lunn.ch>
Date: Mon, 21 Oct 2024 14:22:47 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Inochi Amaoto <inochiama@...il.com>
Cc: Chen Wang <unicorn_wang@...look.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"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>,
	Inochi Amaoto <inochiama@...look.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Richard Cochran <richardcochran@...il.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Yixun Lan <dlan@...too.org>, 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 4/4] net: stmmac: Add glue layer for Sophgo SG2044 SoC

> +static void sophgo_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
> +{
> +	struct sophgo_dwmac *dwmac = priv;
> +	unsigned long rate;
> +	int ret;
> +
> +	switch (speed) {
> +	case SPEED_1000:
> +		rate = 125000000;
> +		break;
> +	case SPEED_100:
> +		rate = 25000000;
> +		break;
> +	case SPEED_10:
> +		rate = 2500000;
> +		break;
> +	default:
> +		dev_err(dwmac->dev, "invalid speed %u\n", speed);
> +		break;
> +	}

There was a helper added recently for this, since it appears
repeatedly in drivers.

> +	ret = regmap_set_bits(regmap, args[0], DWMAC_SG2044_FLAG_USE_RX_DELAY);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "failed to set the phy rx delay\n");

Please could you explain what this delay is for. Is it the 2ns RGMII
delay?

	Andrew