From: Andrew Lunn <andrew@lunn.ch>
To: Raju.Lakkaraju@microsemi.com
Cc: netdev <netdev@vger.kernel.org>
Subject: Re: [v3,net-next] net: phy: Add Edge-rate driver for Microsemi PHYs.
Date: Tue, 27 Sep 2016 23:14:36 +0200 [thread overview]
Message-ID: <20160927211436.GA11602@lunn.ch> (raw)
I just realised the possibly correct binding was starring me in the
face.
--------------------------------------------------------------|
| 3.3V 2.5V 1.8V 1.5V |
|-------------------------------------------------------------|
|-2% -3% -5% -6% |
|-------------------------------------------------------------|
|-4% -6% -9% -14% |
|-------------------------------------------------------------|
|-7% -10% -16% -21% |
|-------------------------------------------------------------|
|-10% -14% -23% -29% |
|-------------------------------------------------------------|
|-17% -23% -35% -42% |
|-------------------------------------------------------------|
|-29% -37% -52% -58% |
|-------------------------------------------------------------|
|-53% -63% -76% -77% |
|-------------------------------------------------------------|
So the binding is:
vsc8531,vddmac : The vddmac in mV.
vsc8531,edge-slowdown : % the edge should be slowed down relative to
the fastest possible edge time.
Given those two values, the driver can work out the magic value to put
into the register that nobody knows the true meaning of.
Andrew
next reply other threads:[~2016-09-27 21:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-27 21:14 Andrew Lunn [this message]
2016-09-28 11:12 ` [v3,net-next] net: phy: Add Edge-rate driver for Microsemi PHYs Raju Lakkaraju
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