linux-kernel - [PATCH v4 1/4] power: bq25890_charger.c: Add debugging output of failed initialization

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Message-Id: <20180731174909.9392-2-angus@akkea.ca>
Date:   Tue, 31 Jul 2018 11:49:06 -0600
From:   "Angus Ainslie (Purism)" <angus@...ea.ca>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     angus.ainslie@...i.sm, Sebastian Reichel <sre@...nel.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Angus Ainslie (Purism)" <angus@...ea.ca>
Subject: [PATCH v4 1/4] power: bq25890_charger.c: Add debugging output of failed initialization

To ease adding a new part variant some debugging is handy.

Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>
---
 drivers/power/supply/bq25890_charger.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 8e2c41ded171..7f0b3a46c50c 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -608,30 +608,40 @@ static int bq25890_hw_init(struct bq25890_device *bq)
 	};
 
 	ret = bq25890_chip_reset(bq);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_dbg(bq->dev, "Reset failed %d\n", ret);
 		return ret;
+	};
 
 	/* disable watchdog */
 	ret = bq25890_field_write(bq, F_WD, 0);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret);
 		return ret;
+	};
 
 	/* initialize currents/voltages and other parameters */
 	for (i = 0; i < ARRAY_SIZE(init_data); i++) {
 		ret = bq25890_field_write(bq, init_data[i].id,
 					  init_data[i].value);
-		if (ret < 0)
+		if (ret < 0) {
+			dev_dbg(bq->dev, "Writing init data failed %d\n", ret);
 			return ret;
+		};
 	}
 
 	/* Configure ADC for continuous conversions. This does not enable it. */
 	ret = bq25890_field_write(bq, F_CONV_RATE, 1);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
 		return ret;
+	};
 
 	ret = bq25890_get_chip_state(bq, &state);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_dbg(bq->dev, "Get state failed %d\n", ret);
 		return ret;
+	};
 
 	mutex_lock(&bq->lock);
 	bq->state = state;
@@ -767,6 +777,9 @@ static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
 			if (props[i].optional)
 				continue;
 
+			dev_err(bq->dev, "Unable to read property %d %s\n", ret,
+				props[i].name);
+
 			return ret;
 		}
 
-- 
2.17.1