linux-kernel - Re: [PATCH net-next 1/6] phy: add 2.5G SGMII mode to the phy

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Message-ID: <20180103172948.GG28752@n2100.armlinux.org.uk>
Date:   Wed, 3 Jan 2018 17:29:48 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        thomas.petazzoni@...e-electrons.com, ymarkman@...vell.com,
        jason@...edaemon.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kishon@...com, nadavh@...vell.com,
        miquel.raynal@...e-electrons.com,
        gregory.clement@...e-electrons.com, stefanc@...vell.com,
        mw@...ihalf.com, davem@...emloft.net,
        linux-arm-kernel@...ts.infradead.org,
        sebastian.hesselbarth@...il.com
Subject: Re: [PATCH net-next 1/6] phy: add 2.5G SGMII mode to the phy_mode
 enum

On Wed, Jan 03, 2018 at 04:08:30PM +0100, Andrew Lunn wrote:
> > > >>> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> > > >>> index 4f8423a948d5..70459a28f3a1 100644
> > > >>> --- a/include/linux/phy/phy.h
> > > >>> +++ b/include/linux/phy/phy.h
> > > >>> @@ -28,6 +28,7 @@ enum phy_mode {
> > > >>>  	PHY_MODE_USB_DEVICE,
> > > >>>  	PHY_MODE_USB_OTG,
> > > >>>  	PHY_MODE_SGMII,
> > > >>> +	PHY_MODE_SGMII_2_5G,
> > > >>>  	PHY_MODE_10GKR,
> > > >>>  	PHY_MODE_UFS_HS_A,
> > > >>>  	PHY_MODE_UFS_HS_B,
> > > >>
> > > >> There was a discussion maybe last month about adding 2.5G SGMII. I
> > > >> would prefer 2500SGMII. Putting the number first makes it uniform with
> > > >> the other defines, 1000BASEX, 25000BASEX, 10GKR.
> > > > 
> > > > Good to know. I wasn't completely sure how to name this mode properly,
> > > > but I'm fine with PHY_MODE_2500SGMII. I'll update the patches and send a
> > > > v2 (without the dt part).
> > > 
> > > And since you are respinning, please make sure you update phy_modes() in
> > > the same header file as well as
> > > Documentation/devicetree/bindings/net/ethernet.txt with the newly added
> > > PHY interface mode.
> > 
> > Actually it's a generic PHY mode I'm adding, not a network PHY mode.
> > There's no phy_modes() function for generic PHYs (and this 2500BaseX
> > mode already is supported in the network PHY modes).
> 
> Hi Antoine
> 
> Don't you need it in both include/linux/phy/phy.h and
> include/linux/phy.h?

Is it really 2.5G SGMII or 2.5G Base-X - iow, which configuration word
is permissible at 2.5G speeds for the pp2?  We already have 2500BASEX
in linux/phy.h, which is the 802.3z compliant 16-bit configuration
word rather than the Cisco variant.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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