linux-kernel - Re: [net-next RFC PATCH v2 3/3] net: phy: Add Airoha AN8855 Internal Switch Gigabit PHY

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Message-ID: <4ad7b2e9-ddf1-4a82-9d60-7afd1856c770@lunn.ch>
Date: Wed, 23 Oct 2024 19:00:22 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"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>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next RFC PATCH v2 3/3] net: phy: Add Airoha AN8855 Internal
 Switch Gigabit PHY

> +static int an8855_config_init(struct phy_device *phydev)
> +{
> +	struct air_an8855_priv *priv = phydev->priv;
> +	int ret;
> +
> +	/* Enable HW auto downshift */
> +	ret = phy_write(phydev, AN8855_PHY_PAGE_CTRL, AN8855_PHY_EXT_PAGE);
> +	if (ret)
> +		return ret;
> +	ret = phy_set_bits(phydev, AN8855_PHY_EXT_REG_14,
> +			   AN8855_PHY_EN_DOWN_SHFIT);
> +	if (ret)
> +		return ret;
> +	ret = phy_write(phydev, AN8855_PHY_PAGE_CTRL, AN8855_PHY_NORMAL_PAGE);
> +	if (ret)
> +		return ret;

There are locking issues here, which is why we have the helpers
phy_select_page() and phy_restore_page(). The air_en8811h.c gets this
right.

Is there anything in common with the en8811h? Does it also support
downshift? Can its LED code be used here?

	   Andrew