From: Dan Murphy <dmurphy@ti.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: <davem@davemloft.net>, <f.fainelli@gmail.com>,
<hkallweit1@gmail.com>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net-next v2 2/3] dt-bindings: dp83td510: Add binding for DP83TD510 Ethernet PHY
Date: Tue, 20 Oct 2020 14:14:17 -0500 [thread overview]
Message-ID: <331e3c73-38ca-3224-c682-5ed3a4ed9f73@ti.com> (raw)
In-Reply-To: <20201020190717.GK139700@lunn.ch>
Andrew
On 10/20/20 2:07 PM, Andrew Lunn wrote:
>> Humm. Are 1v and 2.4v advertised so it can be auto negotiated? Maybe a
>> PHY tunable is not correct? Is this voltage selection actually more
>> like pause and EEE?
> [Goes and looks at the datasheet]
>
> Register 0x20E, bit 13:
>
> 1 = Advertise that the 10BASE-T1L PHY has increased transmit/
> receive level ability
> 0 = Do not advertise that the 10BASE-T1L PHY has increased
> transmit/receive level ability (default)
>
> So does this mean 2.4v?
This can also be strapped to a certain voltage level. The device may
not have the regulators on board to drive a 2.4v signal. 1v signal AVDD
is 1.8v and 2.4v the AVDD needs to be at least 3.3v
This Strap defines the voltage level
requested by PHY during auto
negotiation. It is reflected in bit 12 of
0x20E. While using Force mode for
Linkup, the strap controls the output
voltage and reflects in bit 12 of 0x18F6
Bit 12
1 = Enable 2.4 Vpp operating mode
0 = Enable 1.0 Vpp operating mode
So maybe this is a hybrid of tunable for master/slave and a DT for
voltage level since the ability of the board to drive the signal can vary.
Dan
> Andrew
next prev parent reply other threads:[~2020-10-20 19:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-20 17:12 [PATCH net-next v2 0/3] DP83TD510 Single Pair 10Mbps Ethernet PHY Dan Murphy
2020-10-20 17:12 ` [PATCH net-next v2 1/3] ethtool: Add 10base-T1L link mode entries Dan Murphy
2020-10-20 17:12 ` [PATCH net-next v2 2/3] dt-bindings: dp83td510: Add binding for DP83TD510 Ethernet PHY Dan Murphy
2020-10-20 18:56 ` Andrew Lunn
2020-10-20 19:07 ` Andrew Lunn
2020-10-20 19:14 ` Dan Murphy [this message]
2020-10-20 17:12 ` [PATCH net-next v2 3/3] net: phy: dp83td510: Add support for the " Dan Murphy
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