[PATCH v2 09/10] power: supply: axp288_fuel_gauge: Move the AXP20X_CC_CTRL check together with the other checks

From: Hans de Goede <hdegoede@redhat.com>
To: Sebastian Reichel <sre@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>,
	Andrejus Basovas <cpp@gcc.lt>,
	linux-pm@vger.kernel.org
Subject: [PATCH v2 09/10] power: supply: axp288_fuel_gauge: Move the AXP20X_CC_CTRL check together with the other checks
Date: Fri, 30 Jul 2021 11:56:06 +0200	[thread overview]
Message-ID: <20210730095607.57541-10-hdegoede@redhat.com> (raw)
In-Reply-To: <20210730095607.57541-1-hdegoede@redhat.com>

The I2C-bus to the XPower AXP288 is shared between the Linux kernel and
the SoCs P-Unit. The P-Unit has a semaphore which the kernel must "lock"
before it may use the bus. If not explicitly taken by the I2C-driver,
then this semaphore is automatically taken by the I2C-bus-driver for
each I2C-transfer.

Move the AXP20X_CC_CTRL check done in probe() together with the other
register-accesses done in probe, so that we can take the semaphore once
for the entire set of register-accesses.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/power/supply/axp288_fuel_gauge.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/power/supply/axp288_fuel_gauge.c b/drivers/power/supply/axp288_fuel_gauge.c
index 8db8ab0827e4..016d8d6bec40 100644
--- a/drivers/power/supply/axp288_fuel_gauge.c
+++ b/drivers/power/supply/axp288_fuel_gauge.c
@@ -627,16 +627,6 @@ static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 	if (dmi_check_system(axp288_no_battery_list))
 		return -ENODEV;
 
-	/*
-	 * On some devices the fuelgauge and charger parts of the axp288 are
-	 * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
-	 */
-	ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
-	if (ret < 0)
-		return ret;
-	if (val == 0)
-		return -ENODEV;
-
 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
@@ -671,6 +661,18 @@ static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 		}
 	}
 
+	/*
+	 * On some devices the fuelgauge and charger parts of the axp288 are
+	 * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
+	 */
+	ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
+	if (ret < 0)
+		goto out_free_iio_chan;
+	if (val == 0) {
+		ret = -ENODEV;
+		goto out_free_iio_chan;
+	}
+
 	ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 	if (ret < 0)
 		goto out_free_iio_chan;
-- 
2.31.1

