linux-kernel - Re: [PATCH AUTOSEL 5.4 22/37] MIPS: mscc: ocelot: mark the phy-mode for internal PHY ports

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Date:   Sun, 12 Sep 2021 10:14:33 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Sasha Levin <sashal@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH AUTOSEL 5.4 22/37] MIPS: mscc: ocelot: mark the phy-mode
 for internal PHY ports

Hi Sasha,

On Thu, Sep 09, 2021 at 08:21:27PM -0400, Sasha Levin wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> [ Upstream commit eba54cbb92d28b4f6dc1ed5f73f5187b09d82c08 ]
> 
> The ocelot driver was converted to phylink, and that expects a valid
> phy_interface_t. Without a phy-mode, of_get_phy_mode returns
> PHY_INTERFACE_MODE_NA, which is not ideal because phylink rejects that.
> 
> The ocelot driver was patched to treat PHY_INTERFACE_MODE_NA as
> PHY_INTERFACE_MODE_INTERNAL to work with the broken DT blobs, but we
> should fix the device trees and specify the phy-mode too.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---

Could you please drop this patch?

As discussed here, I did not bother to patch the ocelot switch driver on
stable kernels to support the new device tree binding too:
https://lore.kernel.org/lkml/YR6b15zKkjWFoM1X@piout.net/

So backporting the device tree change would break the old driver.