netdev - Re: [PATCH net-next 6/9] net: hns3: Add MDIO support to HNS3 Ethernet driver for hip08 SoC

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Date:   Wed, 14 Jun 2017 00:40:42 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Salil Mehta <salil.mehta@...wei.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Zhuangyuzeng (Yisen)" <yisen.zhuang@...wei.com>,
        huangdaode <huangdaode@...ilicon.com>,
        "lipeng (Y)" <lipeng321@...wei.com>,
        "mehta.salil.lnk@...il.com" <mehta.salil.lnk@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>
Subject: Re: [PATCH net-next 6/9] net: hns3: Add MDIO support to HNS3
 Ethernet driver for hip08 SoC

> > Hum why do you do this? mdiobus_register() will scan through your bus
> > provided that you set an appropriate phy_mask value (here you tell it
> > not to) and you already provide the PHY address to scan for
> >
> I know this looks weird but the reason why it appears as it is in code is:
>  
> mdiobus_register() calls mdiobus_scan(). If you see below code leg function
> get_phy_device() assumes to be having supporting Clause 22 so its input
> parameter 'is_c45' is always 'false'.
> 
> struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
> {
> 	struct phy_device *phydev;
> 	int err;
> 
> 	phydev = get_phy_device(bus, addr, false);
> 	if (IS_ERR(phydev))                ^^^^^
> 		return phydev;
> 	[...]
> }
> 
> Therefore, to support C45 device we did below:
> 
> * disabled the autoscan/mdiobus_scan() Of the PHY devices using the
>   phy_mask(= ~0) 
> * Now, did almost the same thing what mdiobus_scan does i.e.
>     * get_phy_device but with is_c45 (=true/false)
>     * register the above phy device with phy_device_register()
> 
> There could be some gap in my understanding, please help to correct this?

So this is the question i was asking Florian

Rather than hack around limitations of the core, you should fix the
core. I think we should make the core first try probing using c45. If
that comes back with an error, or does not find a device, try the
probe using c22.

      Andrew