netdev - Re: [PATCH net-next v2 11/12] net: phy: marvell10g: print exact model

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Message-ID: <20210326090734.GP1463@shell.armlinux.org.uk>
Date:   Fri, 26 Mar 2021 09:07:34 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Marek Behún <kabel@...nel.org>
Cc:     Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>, kuba@...nel.org
Subject: Re: [PATCH net-next v2 11/12] net: phy: marvell10g: print exact model

On Thu, Mar 25, 2021 at 09:54:14PM +0100, Marek Behún wrote:
> On Thu, 25 Mar 2021 21:44:21 +0100
> Heiner Kallweit <hkallweit1@...il.com> wrote:
> 
> > On 25.03.2021 21:29, Marek Behún wrote:
> > > On Thu, 25 Mar 2021 15:54:52 +0000
> > > Russell King - ARM Linux admin <linux@...linux.org.uk> wrote:
> > >   
> > >> The 88X3310 and 88X3340 can be differentiated by bit 3 in the revision.
> > >> In other words, 88X3310 is 0x09a0..0x09a7, and 88X3340 is
> > >> 0x09a8..0x09af. We could add a separate driver structure, which would
> > >> then allow the kernel to print a more specific string via standard
> > >> methods, like we do for other PHYs. Not sure whether that would work
> > >> for the 88X21x0 family though.  
> > > 
> > > According to release notes it seems that we can also differentiate
> > > 88E211X from 88E218X (via bit 3 in register 1.3):
> > >  88E211X has 0x09B9
> > >  88E218X has 0x09B1
> > > 
> > > but not 88E2110 from 88E2111
> > >     nor 88E2180 from 88E2181.
> > > 
> > > These can be differentiated via register
> > >   3.0004.7
> > > (bit 7 of MDIO_MMD_PCS.MDIO_SPEED., which says whether device is capable
> > >  of 5g speed)
> > >   
> > 
> > If the PHY ID's are the same but you can use this register to
> > differentiate the two versions, then you could implement the
> > match_phy_device callback. This would allow you to have separate
> > PHY drivers. This is just meant to say you have this option, I don't
> > know the context good enough to state whether it's the better one.
> 
> Nice, didn't know about that. But I fear whether this would always work
> for the 88X3310 vs 88X3310P, it is possible that this feature is only
> recognizable if the firmware in the PHY is already running.

The ID registers aren't programmable and contain the proper IDs even if
there isn't firmware loaded (I've had such a PHY here.)

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