linux-kernel - Re: [PATCH net] net: phy: Document phydev::dev

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Date:   Wed, 26 May 2021 20:01:48 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        olteanv@...il.com, Heiner Kallweit <hkallweit1@...il.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: phy: Document phydev::dev_flags bits allocation

On Wed, May 26, 2021 at 08:53:41PM +0200, Andrew Lunn wrote:
> On Wed, May 26, 2021 at 11:46:17AM -0700, Florian Fainelli wrote:
> > Document the phydev::dev_flags bit allocation to allow bits 15:0 to
> > define PHY driver specific behavior, bits 23:16 to be reserved for now,
> > and bits 31:24 to hold generic PHY driver flags.
> 
> This is good as far as it goes. But do we want to give a hint that if
> the MAC driver sets bits in [15:0] it should first verify the PHY has
> the ID which is expected?

Hi Andrew,

I think we probably need a helper for that - while we can match
phydev->phy_id, that only works for C22 PHYs. Matching the C45
IDs is much more painful. So, I think a helper would be good,
even if initially it just checks the C22 ID.

Thoughts?

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