linux-kernel - Re: [PATCH v2 1/2] net: phy: realtek: Add rtl8211e rx/tx delays config

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Message-ID: <20190426214050.GU4041@lunn.ch>
Date:   Fri, 26 Apr 2019 23:40:50 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Serge Semin <Sergey.Semin@...latforms.ru>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] net: phy: realtek: Add rtl8211e rx/tx delays
 config

On Sat, Apr 27, 2019 at 12:21:11AM +0300, Serge Semin wrote:
> There are two chip pins named TXDLY and RXDLY which actually adds the 2ns
> delays to TXC and RXC for TXD/RXD latching. Alas this is the only
> documented info regarding the RGMII timing control configurations the PHY
> provides. It turns out the same settings can be setup via MDIO registers
> hidden in the extension pages layout. Particularly the extension page 0xa4
> provides a register 0x1c, which bits 1 and 2 control the described delays.
> They are used to implement the "rgmii-{id,rxid,txid}" phy-mode.
> 
> The hidden RGMII configs register utilization was found in the rtl8211e
> U-boot driver:
> https://elixir.bootlin.com/u-boot/v2019.01/source/drivers/net/phy/realtek.c#L99
> 
> There is also a freebsd-folks discussion regarding this register:
> https://reviews.freebsd.org/D13591
> 
> It confirms that the register bits field must control the so called
> configuration pins described in the table 12-13 of the official PHY
> datasheet:
> 8:6 = PHY Address
> 5:4 = Auto-Negotiation
> 3 = Interface Mode Select
> 2 = RX Delay
> 1 = TX Delay
> 0 = SELRGV
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>


Hi Serge

Next time please include a patch 0 containing a cover note explaining
the who series.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew