netdev - Re: [PATCH v2] net: phy: marvell: Honor phy LED set by system firmware on a Dell hardware

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Date:   Thu, 20 Jan 2022 15:26:56 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: phy: marvell: Honor phy LED set by system
 firmware on a Dell hardware

On Thu, Jan 20, 2022 at 01:19:29PM +0800, Kai-Heng Feng wrote:
> BIOS on Dell Edge Gateway 3200 already makes its own phy LED setting, so
> instead of setting another value, keep it untouched and restore the saved
> value on system resume.
> 
> Introduce config_led() callback in phy_driver() to make the implemtation
> generic.

I'm also wondering if we need to take a step back here and get the
ACPI guys involved. I don't know much about ACPI, but shouldn't it
provide a control method to configure the PHYs LEDs?

We already have the basics for defining a PHY in ACPI. See:

https://www.kernel.org/doc/html/latest/firmware-guide/acpi/dsd/phy.html

so you could extend this to include a method to configure the LEDs for
a specific PHY.

  Andrew