From: Andrew Lunn <andrew@lunn.ch>
To: DENG Qingfang <dqfext@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
"Florian Fainelli" <f.fainelli@gmail.com>,
"Heiner Kallweit" <hkallweit1@gmail.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"Landen Chao" <Landen.Chao@mediatek.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"Russell King" <linux@armlinux.org.uk>,
"Sean Wang" <sean.wang@mediatek.com>,
"Vivien Didelot" <vivien.didelot@gmail.com>,
"Vladimir Oltean" <olteanv@gmail.com>,
"Rob Herring" <robh+dt@kernel.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Sergio Paracuellos" <sergio.paracuellos@gmail.com>,
linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
linux-staging@lists.linux.dev, devicetree@vger.kernel.org,
netdev@vger.kernel.org, "Weijie Gao" <weijie.gao@mediatek.com>,
"Chuanhong Guo" <gch981213@gmail.com>,
"René van Dorst" <opensource@vdorst.com>
Subject: Re: [RFC net-next 1/4] net: phy: add MediaTek PHY driver
Date: Tue, 6 Apr 2021 17:21:23 +0200 [thread overview]
Message-ID: <YGx8c5Jt2D7fB0cO@lunn.ch> (raw)
In-Reply-To: <20210406141819.1025864-2-dqfext@gmail.com>
On Tue, Apr 06, 2021 at 10:18:16PM +0800, DENG Qingfang wrote:
> Add support for MediaTek PHYs found in MT7530 and MT7531 switches.
Do you know if this PHY is available standalone?
> +static int mt7531_phy_config_init(struct phy_device *phydev)
> +{
> + mtk_phy_config_init(phydev);
> +
> + /* PHY link down power saving enable */
> + phy_set_bits(phydev, 0x17, BIT(4));
> + phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1, 0xc6, 0x300);
> +
> + /* Set TX Pair delay selection */
> + phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x13, 0x404);
> + phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x14, 0x404);
This gets me worried about RGMII delays. We have had bad backwards
compatibility problems with PHY drivers which get RGMII delays wrong.
Since this is an internal PHY, i suggest you add a test to the
beginning of mt7531_phy_config_init():
if (phydev->interface != PHY_INTERFACE_MODE_INTERNAL)
return -EINVAL;
We can then solve RGMII problems when somebody actually needs RGMII.
Andrew
next prev parent reply other threads:[~2021-04-06 15:34 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-06 14:18 [RFC net-next 0/4] MT7530 interrupt support DENG Qingfang
2021-04-06 14:18 ` [RFC net-next 1/4] net: phy: add MediaTek PHY driver DENG Qingfang
2021-04-06 15:21 ` Andrew Lunn [this message]
2021-04-06 15:37 ` DENG Qingfang
2021-04-06 15:47 ` Chun-Kuang Hu
2021-04-06 15:57 ` DENG Qingfang
2021-04-06 16:05 ` Andrew Lunn
2021-04-06 16:06 ` Chun-Kuang Hu
2021-04-06 16:02 ` Andrew Lunn
2021-04-06 16:14 ` Chun-Kuang Hu
2021-04-06 14:18 ` [RFC net-next 2/4] net: dsa: mt7530: add interrupt support DENG Qingfang
2021-04-06 15:30 ` Andrew Lunn
2021-04-06 15:39 ` DENG Qingfang
2021-04-06 15:49 ` Andrew Lunn
2021-04-06 16:02 ` DENG Qingfang
2021-04-06 14:18 ` [RFC net-next 3/4] dt-bindings: net: dsa: add MT7530 interrupt controller binding DENG Qingfang
2021-04-06 14:18 ` [RFC net-next 4/4] staging: mt7621-dts: enable MT7530 interrupt controller DENG Qingfang
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