netdev - Re: [PATCH V3 1/2] net: phy: micrel: Discern KSZ8051 and KSZ8795 PHYs

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Message-ID: <174ba346-b87d-d928-5ef2-59287d5280be@denx.de>
Date:   Sun, 13 Oct 2019 22:29:31 +0200
From:   Marek Vasut <marex@...x.de>
To:     Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        George McCollister <george.mccollister@...il.com>,
        Sean Nyekjaer <sean.nyekjaer@...vas.dk>,
        Tristram Ha <Tristram.Ha@...rochip.com>,
        Woojung Huh <woojung.huh@...rochip.com>
Subject: Re: [PATCH V3 1/2] net: phy: micrel: Discern KSZ8051 and KSZ8795 PHYs

On 10/13/19 10:15 PM, Heiner Kallweit wrote:
> On 13.10.2019 21:34, Marek Vasut wrote:
>> The KSZ8051 PHY and the KSZ8794/KSZ8795/KSZ8765 switch share exactly the
>> same PHY ID. Since KSZ8051 is higher in the ksphy_driver[] list of PHYs
>> in the micrel PHY driver, it is used even with the KSZ87xx switch. This
>> is wrong, since the KSZ8051 configures registers of the PHY which are
>> not present on the simplified KSZ87xx switch PHYs and misconfigures
>> other registers of the KSZ87xx switch PHYs.
>>
>> Fortunatelly, it is possible to tell apart the KSZ8051 PHY from the
>> KSZ87xx switch by checking the Basic Status register Bit 0, which is
>> read-only and indicates presence of the Extended Capability Registers.
>> The KSZ8051 PHY has those registers while the KSZ87xx switch does not.
>>
>> This patch implements simple check for the presence of this bit for
>> both the KSZ8051 PHY and KSZ87xx switch, to let both use the correct
>> PHY driver instance.
>>
>> Signed-off-by: Marek Vasut <marex@...x.de>
>> Cc: Andrew Lunn <andrew@...n.ch>
>> Cc: David S. Miller <davem@...emloft.net>
>> Cc: Florian Fainelli <f.fainelli@...il.com>
>> Cc: George McCollister <george.mccollister@...il.com>
>> Cc: Heiner Kallweit <hkallweit1@...il.com>
>> Cc: Sean Nyekjaer <sean.nyekjaer@...vas.dk>
>> Cc: Tristram Ha <Tristram.Ha@...rochip.com>
>> Cc: Woojung Huh <woojung.huh@...rochip.com>
>> Fixes: 9d162ed69f51 ("net: phy: micrel: add support for KSZ8795")
> 
> The Fixes tag has to be the first one. And patch still misses
> the "net" annotation. For an example just see other fix submissions
> on the mailing list.

The "net" annotation ? The net: tag is right there in the subject.