linux-kernel - Re: [PATCH v2] dt-bindings: gnss: u-blox: use open-drain reset and safeboot in example

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Message-ID: <aR85zGurgup1w28b@hovoldconsulting.com>
Date: Thu, 20 Nov 2025 16:54:52 +0100
From: Johan Hovold <johan@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alejandro Enrique <alejandroe1@...tab.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dt-bindings: gnss: u-blox: use open-drain reset and
 safeboot in example

On Fri, Nov 14, 2025 at 04:54:13PM +0100, Johan Hovold wrote:
> The RESET_N and SAFEBOOT_N pins should typically be left open and only
> be connected to ground in rare cases where a device is misbehaving.
> 
> Specify GPIO_OPEN_DRAIN in the example as this is what should generally
> be used.
> 
> Note that the current Linux driver implementation depends on these pins
> being declared open-drain so that they are not driven while the main
> supply is off.

This statement is too strong as there would typically be a level shifter
preventing the signals from being driven so I dropped this paragraph.
 
> Signed-off-by: Johan Hovold <johan@...nel.org>

Johan