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

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Date: Sat, 25 Nov 2023 16:52:19 -0800
From: Florian Fainelli <f.fainelli@...il.com>
To: Christian Marangi <ansuelsmth@...il.com>,
 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 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?
-- 
Florian