linux-kernel - Re: [PATCH v2] thermal: rcar_gen3_thermal: improve logging during probe

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Message-ID: <YqNAXofRPsDasXi4@oden.dyn.berto.se>
Date:   Fri, 10 Jun 2022 15:00:14 +0200
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-renesas-soc@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] thermal: rcar_gen3_thermal: improve logging during
 probe

Hi Wolfram,

Thanks for your work.

On 2022-06-09 22:07:09 +0200, Wolfram Sang wrote:
> When setting up a new board, a plain "Can't register thermal zone"
> didn't help me much because the thermal zones in DT were all fine. I
> just had a sensor entry too much in the parent TSC node. Reword the
> failure/success messages to contain the sensor number to make it easier
> to understand which sensor is affected. Example output now:
> 
> rcar_gen3_thermal e6198000.thermal: Sensor 0: Loaded 1 trip point
> rcar_gen3_thermal e6198000.thermal: Sensor 1: Loaded 1 trip point
> rcar_gen3_thermal e6198000.thermal: Sensor 2: Loaded 1 trip point
> rcar_gen3_thermal e6198000.thermal: Sensor 3: Can't register thermal zone
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---
> 
> Change from v1: reword the dev_info string to be more like the original
> one. Added a check to add the plural-'s' only when needed.
> 
> Geert: is this better now?
> 
>  drivers/thermal/rcar_gen3_thermal.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
> index ccdf8a24ddc7..f7357b5bd506 100644
> --- a/drivers/thermal/rcar_gen3_thermal.c
> +++ b/drivers/thermal/rcar_gen3_thermal.c
> @@ -511,7 +511,7 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
>  		zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
>  							    &rcar_gen3_tz_of_ops);
>  		if (IS_ERR(zone)) {
> -			dev_err(dev, "Can't register thermal zone\n");
> +			dev_err(dev, "Sensor %u: Can't register thermal zone\n", i);
>  			ret = PTR_ERR(zone);
>  			goto error_unregister;
>  		}
> @@ -533,7 +533,8 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
>  		if (ret < 0)
>  			goto error_unregister;
>  
> -		dev_info(dev, "TSC%u: Loaded %d trip points\n", i, ret);
> +		dev_info(dev, "Sensor %u: Loaded %u trip point%s\n", i, ret,
> +			 ret == 1 ? "" : "s");

Bikeshedding, I'm not keen on this style as it makes it harder IMHO to 
grep for log strings in the code. But I don't dislike it enough to ask 
you to change it ;-) So if you and Geert are happy with this style,

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Do feel free to keep the tag if you send a version without the plural 
special case.

>  	}
>  
>  	if (!priv->num_tscs) {
> -- 
> 2.35.1
> 

-- 
Kind Regards,
Niklas Söderlund