linux-kernel - Re: [PATCH v2] usb: typec: ucsi: Mark dGPUs as DEVICE scope

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Message-ID: <6f1e866b-a96a-3134-c735-c941681b0638@gmail.com>
Date:   Sun, 21 May 2023 11:23:37 +0200
From:   Gregor Riepl <onitake@...il.com>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     linux-i2c@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Evan.Quan@....com, Lijo.Lazar@....com, Sanket.Goswami@....com,
        heikki.krogerus@...ux.intel.com, ajayg@...dia.com,
        andriy.shevchenko@...ux.intel.com
Subject: Re: [PATCH v2] usb: typec: ucsi: Mark dGPUs as DEVICE scope

> As the power supply for a dGPU is only for powering devices connected
> to dGPU, create a device property to indicate that the UCSI endpoint
> is only for the scope of `POWER_SUPPLY_SCOPE_DEVICE`.

Is this a given fact?

I could imagine that a dGPU device would be capable of feeding power 
back into the system, for example when an external docking station or 
display device has a power supply connected to it.

Although I don't think it's possible (or safe) with a desktop system, 
maybe a portable computer with a discrete GPU would be able to do this?