linux-kernel - Re: [PATCH] usb: typec: pd: Add symlink to linked device

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Message-ID: <Y3vNZEuNI3CWzZ0L@chromium.org>
Date:   Mon, 21 Nov 2022 19:11:32 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Benson Leung <bleung@...omium.org>
Subject: Re: [PATCH] usb: typec: pd: Add symlink to linked device

Hi Greg,

On Nov 21 08:36, Greg Kroah-Hartman wrote:
> On Mon, Nov 21, 2022 at 07:16:03AM +0000, Prashant Malani wrote:
> > On Nov 21 07:35, Greg Kroah-Hartman wrote:
> > > On Mon, Nov 21, 2022 at 06:20:39AM +0000, Prashant Malani wrote:
> 
> Why either?  What exactly is this "device" that you are trying to link
> to?  And why not just use the real device symlink instead?

It's the Type-C port partner device, created here [1]

> > 
> > > 
> > > What in userspace wants to see this symlink?
> > 
> > ChromeOS's userspace Type-C daemon. It listens for Type-C partner uevents, but the PD objects
> > can be created later (and destroyed and then recreated again, for PD chargers which dynamically
> > change their source caps), and this helps determine which partner does those events apply to.
> 
> Then set up the proper device symlink like the driver model supports,
> then you don't have to create a new one, and you don't have to add the
> documentation entry as it's implied.

Sounds good. I'll submit a new series (or single patch) which follows this approach.

Thanks again!

-Prashant

[1] https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/tree/drivers/usb/typec/class.c?h=usb-next#n885