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

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Date:   Fri, 21 Jan 2022 12:01:35 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Andrew Lunn <andrew@...n.ch>
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 10:26 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> 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

These properties seem to come from device-tree.

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

How to add new properties? Is it required to add new properties to
both DT and ACPI?
Looks like many drivers use _DSD freely, but those properties are not
defined in ACPI spec...

Kai-Heng

>
>   Andrew