linux-kernel - Re: [PATCH net-next v3] net: phy: micrel: add phy-mode support for the KSZ9031 PHY

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Message-ID: <49e9c223-78ed-f735-1787-f8c38cb18b1c@pengutronix.de>
Date:   Tue, 7 Apr 2020 13:02:27 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Philippe Schenker <philippe.schenker@...adex.com>,
        "o.rempel@...gutronix.de" <o.rempel@...gutronix.de>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "david@...tonic.nl" <david@...tonic.nl>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH net-next v3] net: phy: micrel: add phy-mode support for
 the KSZ9031 PHY

On 4/7/20 12:57 PM, Philippe Schenker wrote:
> On Tue, 2020-04-07 at 11:36 +0200, Oleksij Rempel wrote:
>> Add support for following phy-modes: rgmii, rgmii-id, rgmii-txid,
>> rgmii-rxid.
>>
>> This PHY has an internal RX delay of 1.2ns and no delay for TX.
>>
>> The pad skew registers allow to set the total TX delay to max 1.38ns
>> and
>> the total RX delay to max of 2.58ns (configurable 1.38ns + build in
>> 1.2ns) and a minimal delay of 0ns.
>>
>> According to the RGMII v1.3 specification the delay provided by PCB
>> traces
>> should be between 1.5ns and 2.0ns. The RGMII v2.0 allows to provide
>> this
>> delay by MAC or PHY. So, we configure this PHY to the best values we
>> can
>> get by this HW: TX delay to 1.38ns (max supported value) and RX delay
>> to
>> 1.80ns (best calculated delay)
>>
>> The phy-modes can still be fine tuned/overwritten by *-skew-ps
>> device tree properties described in:
>> Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
>>
>> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> 
> Make sure you do not exceet 80 chars with your phydev_warn. Besides
> that:

Warning and Error strings should not be wrapped, so that you can better
"grep" for them.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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