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

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Date:   Thu,  9 Jun 2022 22:07:09 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-renesas-soc@...r.kernel.org
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        "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: [PATCH v2] thermal: rcar_gen3_thermal: improve logging during probe

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