linux-kernel - Re: [PATCH v3 2/3] dt-bindings: gnss: u-blox: add "reset-gpios" binding

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Message-ID: <ZTYYKVTYEa6roCci@ninjato>
Date:   Mon, 23 Oct 2023 08:52:25 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-renesas-soc@...r.kernel.org,
        Conor Dooley <conor.dooley@...rochip.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] dt-bindings: gnss: u-blox: add "reset-gpios"
 binding

Hi Johan,

> And what GNSS chip/module is this? This should also be included in the
> commit message.

Ok. UBlox Neo-M8.

> Do you have a link to a datasheet?

https://www.u-blox.com/sites/default/files/NEO-M8-FW3_DataSheet_UBX-15031086.pdf

> None of the u-blox modules I've seen have a reset line so I'd like to
> where this came from and how it is intended to be used.

I didn't know that old modules did not have the reset pin. I thought
they were simply not used, so far. This one has. Check pin8 in chapter
2.1 in the datasheet.

> The mediatek driver does not support managing a reset line, but the
> binding includes a description of this pin for completeness. Also you
> don't seem include any description of the property below (which is fine)
> so perhaps you can just drop this sentence.

Correct.

Kind regards,

   Wolfram


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