netdev - Re: [PATCH net-next 1/4] net: phy: add MediaTek PHY driver

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Date:   Thu, 29 Apr 2021 23:26:06 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     DENG Qingfang <dqfext@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Sean Wang <sean.wang@...iatek.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-staging@...ts.linux.dev, devicetree@...r.kernel.org,
        netdev@...r.kernel.org, Weijie Gao <weijie.gao@...iatek.com>,
        Chuanhong Guo <gch981213@...il.com>,
        René van Dorst <opensource@...rst.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH net-next 1/4] net: phy: add MediaTek PHY driver

On Thu, Apr 29, 2021 at 02:21:27PM +0800, DENG Qingfang wrote:
> Add support for MediaTek PHYs found in MT7530 and MT7531 switches.
> The initialization procedure is from the vendor driver, but due to lack
> of documentation, the function of some register values remains unknown.
> 
> Signed-off-by: DENG Qingfang <dqfext@...il.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

> +
> +	/* Enable HW auto downshift */
> +	phy_modify_paged(phydev, MTK_PHY_PAGE_EXTENDED, 0x14, 0, BIT(4));

As a follow up patch, you could add support for controlling this via a
PHY tunable.

    Andrew