linux-kernel - Re: [net-next PATCH 3/3] net: phy: add support for PHY package MMD read/write

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Date:   Sun, 26 Nov 2023 01:54:35 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>,
        David Epping <david.epping@...singlinkelectronics.com>,
        Harini Katakam <harini.katakam@....com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH 3/3] net: phy: add support for PHY package MMD
 read/write

On Sat, Nov 25, 2023 at 04:52:19PM -0800, Florian Fainelli wrote:
> 
> 
> On 11/25/2023 4:37 PM, Christian Marangi wrote:
> > Some PHY in PHY package may require to read/write MMD regs to correctly
> > configure the PHY package.
> > 
> > Add support for these additional required function in both lock and no
> > lock variant.
> > 
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
> >   include/linux/phy.h | 74 +++++++++++++++++++++++++++++++++++++++++++++
> >   1 file changed, 74 insertions(+)
> > 
> > diff --git a/include/linux/phy.h b/include/linux/phy.h
> > index 984bca9a82f4..1799133c8387 100644
> > --- a/include/linux/phy.h
> > +++ b/include/linux/phy.h
> > @@ -2067,6 +2067,80 @@ static inline int __phy_package_write(struct phy_device *phydev,
> >   	return __mdiobus_write(phydev->mdio.bus, addr, regnum, val);
> >   }
> > +static inline int phy_package_read_mmd(struct phy_device *phydev,
> > +				       unsigned int addr_offset, int devad,
> > +				       u32 regnum)
> > +{
> > +	struct phy_package_shared *shared = phydev->shared;
> > +	struct mii_bus *bus = phydev->mdio.bus;
> > +	int addr, val;
> > +
> > +	if (!shared || shared->base_addr + addr_offset > PHY_MAX_ADDR)
> > +		return -EIO;
> 
> You might be off by one here, should not that >= PHY_MAX_ADDR here and
> below?

Thanks for the review. Yes PHY_MAX_ADDR is 32 so I should use >=.

(interesting choice to use 32 instead of 31 as MAX, guess an old mistake)

-- 
	Ansuel