linux-kernel - Re: [PATCH 18/22] dt-bindings: chrome: Add binding for ChromeOS Pogo pin connector

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Message-ID: <CAD=FV=WE4bgwTWTKjPbQR9RCt-SEVZXfQtXoaXAjvTiZiMr=wA@mail.gmail.com>
Date: Tue, 13 Feb 2024 17:17:34 -0800
From: Doug Anderson <dianders@...omium.org>
To: Stephen Boyd <swboyd@...omium.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	patches@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	Pin-yen Lin <treapking@...omium.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Benson Leung <bleung@...omium.org>, Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH 18/22] dt-bindings: chrome: Add binding for ChromeOS Pogo
 pin connector

Hi,

On Fri, Feb 9, 2024 at 11:10 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> Describe the set of pins used to connect the detachable keyboard on
> detachable ChromeOS devices. The set of pins is called the "pogo pins".
> It's basically USB 2.0 with an extra pin for base detection. We expect
> to find a keyboard on the other side of this connector with a specific
> vid/pid, so describe that as a child device at the port of the usb
> device connected upstream.

Can you remind me what the side effects would be if a different
VID/PID shows up there? I know it's not an end-user scenario, but I
have a pre-production "coachz" keyboard that's actually programmed
incorrectly and shows up as the wrong PID. Presumably I could either
throw the old hardware away or figure out a way to re-program it and
it's really not a big deal, but just curious what happens...


-Doug