netdev - Re: [PATCH v2 4/6] net: phy: at803x: mention AR8033 as same as AR8031

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Date:   Thu, 07 Nov 2019 08:47:25 +0100
From:   Michael Walle <michael@...le.cc>
To:     Andrew Lunn <andrew@...n.ch>
CC:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        netdev@...r.kernel.org, Rob Herring <robh@...nel.org>,
        David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>
Subject: Re: [PATCH v2 4/6] net: phy: at803x: mention AR8033 as same as AR8031

Am 7. November 2019 03:04:36 MEZ schrieb Andrew Lunn <andrew@...n.ch>:
>On Wed, Nov 06, 2019 at 11:36:15PM +0100, Michael Walle wrote:
>> The AR8033 is the AR8031 without PTP support. All other registers are
>> the same. Unfortunately, they share the same PHY ID. Therefore, we
>> cannot distinguish between the one with PTP support and the one
>without.
>
>Not nice. I suppose there might be a PTP register you can read to
>determine this, but that is not very helpful.

I tried that actually.. There is a PTP enable bit. It's default is 1 (according to the AR8031 datasheet). Now guess what it's value is on the AR8033.. its also 1. Not enough.. I also tried to enable the realtime counter. well that worked too.

And yes. I've double checked the package marking. It definitely was an AR8033. So either I was just lucky, or maybe.. the AR8033 is just a relabled AR8031 ;) 

-michael