netdev - Re: [RFC lora-next 5/5] HACK: net: lora: sx130x: Add PicoCell gateway shim for cdc-acm

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Date:   Fri, 4 Jan 2019 11:07:45 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andreas Färber <afaerber@...e.de>
Cc:     linux-lpwan@...ts.infradead.org,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Johan Hovold <johan@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [RFC lora-next 5/5] HACK: net: lora: sx130x: Add PicoCell gateway
 shim for cdc-acm

On Fri, Jan 4, 2019 at 5:21 AM Andreas Färber <afaerber@...e.de> wrote:
>
> Ignore our device in cdc-acm probing and add a new driver for it,
> dispatching to cdc-acm for the actual implementation.
>
> WARNING: It is likely that this VID/PID is in use for unrelated devices.
> Only the Product string hints what this really is in current v0.2.1.
> Previous code v0.2.0 was using a Semtech VID/PID, but no card shipping
> with such firmware is known to me.
>
> While this may seem unorthodox, no internals of the driver are accessed,
> just the set of driver callbacks is duplicated as shim.
>
> Use this shim construct to fake DT nodes for serdev on probe.
> For testing purposes these nodes do not have a parent yet.
> This results in two "Error -2 creating of_node link" warnings on probe.

It looks like the DT is pretty static. Rather than creating the nodes
at run-time, can't you create a dts file and build that into your
module.

Rob