linux-kernel - Re: [PATCH net-next 0/3] net: dsa: restore HWMON support in dsa2

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Date:   Tue, 03 Jan 2017 14:24:02 -0500
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>, cphealy@...il.com
Subject: Re: [PATCH net-next 0/3] net: dsa: restore HWMON support in dsa2

Hi Andrew,

Andrew Lunn <andrew@...n.ch> writes:

> On Tue, Jan 03, 2017 at 01:15:35PM -0500, Vivien Didelot wrote:
>> The current HWMON support in DSA in embedded in the legacy code.
>> Extract it to its own file and register it in the newer DSA code.
>
> I would really prefer not to do this.
>
> The temperature sensor is in the embedded PHYs of the switch. Many of
> Marvell discrete PHYs also have the same temperature sensor. The
> correct thing to do is move this code into drivers/net/phy/marvell.c.

I agree that the temperature code in the mv88e6xxx driver must be moved
to the Marvell PHY driver.

However I still think this patchset is still valuable because at least
it isolates the HWMON code in DSA which is good, and I think some chips
do have temperature sensors in their cores, not in their PHYs. So the
new DSA code should benefit from the HWMON support instead of
considering this a regression for its users.

Thanks,

        Vivien