linux-kernel - Re: [PATCH v4 1/2] gnss: ubx: customize serial device open to set U-Blox Zed-F9P baud

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Date:   Mon, 8 May 2023 10:00:53 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     alison@...-devel.com, johan@...nel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, achaiken@...ora.tech
Subject: Re: [PATCH v4 1/2] gnss: ubx: customize serial device open to set
 U-Blox Zed-F9P baud

On 08/05/2023 03:11, alison@...-devel.com wrote:
> From: Alison Chaiken <achaiken@...ora.tech>
> 
> Add support for setting the baud rate of U-Blox Zed-F9P GNSS devices.
> Provide functions that support writing of arbitrary configuration
> messages to the device plus one that specifically configures the baud
> rate.  Override the default gnss_serial_open() with a new method that
> writes the configuration message to the GNSS if the devicetree declares
> it to be a Zed F9P and requests a non-default baud.  Add a boolean flag
> to the ubx_data private data of the GNSS driver in order to track
> whether the configuration message has already been written.  Set the Zed
> F9P to its default port speed if the devicetree does not specify a
> value.
> 
> Signed-off-by: Alison Chaiken <achaiken@...ora.tech>
> ---
> 
> V5 -> V4 Compile out the changes if CONFIG_OF is not set.

Judging by the number of kernel test robot failures, I am not sure if
you tested the patch.

Anyway, don't add more #ifdefs, that's not a correct approach. Depending
on the case, you either remove if entirely or add __maybe_unused. Why
did you need to add the #ifdefs?



Best regards,
Krzysztof