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Subject: Re: [PATCH net-next v3] net: phy: micrel: add phy-mode support for
 the KSZ9031 PHY
To:     Philippe Schenker <philippe.schenker@toradex.com>,
        "o.rempel@pengutronix.de" <o.rempel@pengutronix.de>,
        "hkallweit1@gmail.com" <hkallweit1@gmail.com>,
        "f.fainelli@gmail.com" <f.fainelli@gmail.com>,
        "andrew@lunn.ch" <andrew@lunn.ch>
Cc:     "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux@armlinux.org.uk" <linux@armlinux.org.uk>,
        "kernel@pengutronix.de" <kernel@pengutronix.de>,
        "david@protonic.nl" <david@protonic.nl>,
        "davem@davemloft.net" <davem@davemloft.net>
References: <20200407093654.26095-1-o.rempel@pengutronix.de>
 <699bf716ce12178655b47ce77227e4e42b85de1b.camel@toradex.com>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Message-ID: <49e9c223-78ed-f735-1787-f8c38cb18b1c@pengutronix.de>
Date:   Tue, 7 Apr 2020 13:02:27 +0200
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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@pengutronix.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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