linux-kernel - 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 17:00:37 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Christian Marangi <ansuelsmth@...il.com>,
        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 11/25/2023 4:54 PM, Christian Marangi wrote:
> 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)

It has historically been used as an iterator upper bound, hence the 32.
-- 
Florian