linux-kernel - Re: [PATCH v2 net-next] net: phy: mchp: Add 1588 support for LAN8814 Quad PHY

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Date:   Mon, 14 Dec 2020 20:06:57 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Divya Koppera <Divya.Koppera@...rochip.com>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        kuba@...nel.org, marex@...x.de, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v2 net-next] net: phy: mchp: Add 1588 support for LAN8814
 Quad PHY

> +static int lan8814_read_page_reg(struct phy_device *phydev,
> +				 int page, u32 addr)
> +{
> +	u32 data;
> +
> +	phy_write(phydev, KSZ_EXT_PAGE_ACCESS_CONTROL, page);
> +	phy_write(phydev, KSZ_EXT_PAGE_ACCESS_ADDRESS_DATA, addr);
> +	phy_write(phydev, KSZ_EXT_PAGE_ACCESS_CONTROL, (page | 0x4000));
> +	data = phy_read(phydev, KSZ_EXT_PAGE_ACCESS_ADDRESS_DATA);
> +
> +	return data;
> +}
> +
> +static int lan8814_write_page_reg(struct phy_device *phydev,
> +				  int page, u16 addr, u16 val)
> +{
> +	phy_write(phydev, KSZ_EXT_PAGE_ACCESS_CONTROL, page);
> +	phy_write(phydev, KSZ_EXT_PAGE_ACCESS_ADDRESS_DATA, addr);
> +	phy_write(phydev, KSZ_EXT_PAGE_ACCESS_CONTROL, (page | 0x4000));
> +	val = phy_write(phydev, KSZ_EXT_PAGE_ACCESS_ADDRESS_DATA, val);
> +	if (val != 0) {
> +		phydev_err(phydev, "Error: phy_write_mmd has returned error %d\n",
> +			   val);
> +		return val;
> +	}
> +	return 0;
> +}

I think you can just use phy_read_mmd() and phy_write_mmd().

  Andrew