linux-kernel - Re: [PATCH 2/2] dt-bindings: usb: ti,usb8041: Add binding for TI USB8044 hub controller

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Message-ID: <20250508-waving-sustainer-28fe228e01f8@spud>
Date: Thu, 8 May 2025 16:53:27 +0100
From: Conor Dooley <conor@...nel.org>
To: Mike Looijmans <mike.looijmans@...ic.nl>
Cc: linux-usb@...r.kernel.org,
	Alexander Stein <alexander.stein@...tq-group.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: usb: ti,usb8041: Add binding for TI
 USB8044 hub controller

On Thu, May 08, 2025 at 05:19:03PM +0200, Mike Looijmans wrote:
> On 08-05-2025 16:58, Conor Dooley wrote:
> > On Wed, May 07, 2025 at 03:11:43PM +0200, Mike Looijmans wrote:
> > > The TI USB8044 is similar to the USB8041.
> > Similar how? Why's a fallback not suitable?
> 
> I don't quite understand what is meant by "fallback" here?

A fallback compatible, since you;re using the same match data as the
8041.

> It's similar in that the USB8044 provides the same functionality and can use
> the same driver as the USB8041, all that is needed is to add the PID/VID
> values.

Is this onboard_dev_id_table table with the vid/pid used in combination
with dt, or in-place of dt when device detection is dynamic? If the
latter, why can't dt use a fallback compatible since the handling is
identical to the 8041?


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