netdev - RE: create drivers/net/mdio and move mdio drivers into it

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Date:   Mon, 20 Feb 2017 06:26:12 +0000
From:   YUAN Linyu <Linyu.Yuan@...atel-sbell.com.cn>
To:     Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "cugyly@....com" <cugyly@....com>
Subject: RE: create drivers/net/mdio and move mdio drivers into it



> -----Original Message-----
> From: Florian Fainelli [mailto:f.fainelli@...il.com]
> Sent: Monday, February 20, 2017 2:16 PM
> To: YUAN Linyu; David S . Miller; Andrew Lunn
> Cc: netdev@...r.kernel.org; cugyly@....com
> Subject: Re: create drivers/net/mdio and move mdio drivers into it
> 
> 
> 
> On 02/19/2017 10:10 PM, YUAN Linyu wrote:
> >
> >
> >> -----Original Message-----
> >> From: Florian Fainelli [mailto:f.fainelli@...il.com]
> >> Sent: Monday, February 20, 2017 1:42 PM
> >> To: YUAN Linyu; David S . Miller; Andrew Lunn
> >> Cc: netdev@...r.kernel.org; cugyly@....com
> >> Subject: Re: create drivers/net/mdio and move mdio drivers into it
> >>> 3. another idea is bind mdio device to network device
> >>
> >> You would have to be more specific about what you want to do here. If
> >> the MDIO device is e.g: a switch, what we recommend doing is provide a
> >> fixed-link node that describes how the Ethernet MAC and the switch's
> >> CPU/management ports are connected (that way the MAC always "sees"
> the
> >> link as UP, running with a specific speed and duplex).
> >>
> > Yes, some system will configured the phy to fixed speed/duplex at boot time,
> > no phy driver used in kernel at all.
> 
> There is always a PHY driver used, either is a dedicated one, or its the
> generic PHY driver in drivers/net/phy/phy_device.c, even when fixed
> PHYs/link are used.
> 
> > If network device know mdio device it used, we can do phy dump through this
> > mdio device driver.
> 
> We are not going to accept MDIO device drivers whose only purpose is to
> allow PHY devices register dumps. Implement a proper PHY driver for
> these devices, if nothing needs to be done, you just need to call into
> genphy_* functions, and just override how to do register dumps.
> 
No, we discuss mdio driver here, not phy driver.
I mean if a network device know mdio device it used, we use mdio driver to 
dump any register of phy device even it's driver is not build.

> >
> >> If this is a different kind of MDIO device, e.g: an USB/PCIe/SATA PHY,
> >> there is no network device associated with those.
> >>
> > mdio under drivers/net/, it will not cover these devices.
> >
> 
> --
> Florian