netdev - Re: [PATCH v1 2/2] net: stmmac: Add NPCM support

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Date: Tue, 21 Nov 2023 17:00:53 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Tomer Maimon <tmaimon77@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, alexandre.torgue@...s.st.com,
	peppe.cavallaro@...com, joabreu@...opsys.com,
	mcoquelin.stm32@...il.com, avifishman70@...il.com,
	tali.perry1@...il.com, joel@....id.au, andrew@...econstruct.com.au,
	venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
	j.neuschaefer@....net, openbmc@...ts.ozlabs.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
Subject: Re: [PATCH v1 2/2] net: stmmac: Add NPCM support

> +void npcm_dwmac_pcs_init(struct npcm_dwmac *dwmac, struct device *dev,
> +			 struct plat_stmmacenet_data *plat_dat)
> +{
> +	u16 val;
> +
> +	iowrite16((u16)(SR_MII_CTRL >> 9), dwmac->reg + IND_AC_BA_REG);
> +	val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG);
> +	val |= PCS_RST;
> +	iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG);
> +
> +	while (val & PCS_RST)
> +		val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG);
> +
> +	val &= ~(PCS_AN_ENABLE);
> +	iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG);
> +}

Is this a licensed PCS implementation? Or home grown? If its been
licensed from somebody, it maybe should live in driver/net/pcs, so
others can reuse it when they license the same core.

       Andrew