[RFC PATCH 2/4] charger-manager: Get power_supply device using of_power_supply_get_dev()

[Chanwoo Choi]

This patch use of_power_supply_get_dev() dt funtion to get power_supply device
instead of legacy method. This patch get direclty the instance of power supply
device from dt.

Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Signed-off-by: Myungjoo Ham <myungjoo.ham@xxxxxxxxxxx>
---
---
 drivers/power/charger-manager.c       | 22 ++++++++++++++++------
 include/linux/power/charger-manager.h |  2 ++
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index 9e4dab4..a5bb9ae 100644
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -23,6 +23,7 @@
 #include <linux/workqueue.h>
 #include <linux/platform_device.h>
 #include <linux/power/charger-manager.h>
+#include <linux/power/of_power_supply.h>
 #include <linux/regulator/consumer.h>
 #include <linux/sysfs.h>
 #include <linux/of.h>
@@ -1584,7 +1585,12 @@ static struct charger_desc *of_cm_parse_desc(struct device *dev)
 		}
 	}
 
-	of_property_read_string(np, "cm-fuel-gauge", &desc->psy_fuel_gauge);
+	desc->fuel_gauge = of_power_supply_get_dev(dev,
+						POWER_SUPPLY_DEV_FUELGAUGE, 0);
+	if (IS_ERR_OR_NULL(desc->fuel_gauge)) {
+		dev_err(dev, "Failed to get device instance of fuel-gague\n");
+		return ERR_PTR(-ENODEV);
+	}
 
 	of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
 
@@ -1739,11 +1745,15 @@ static int charger_manager_probe(struct platform_device *pdev)
 		}
 	}
 
-	cm->fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
-	if (!cm->fuel_gauge) {
-		dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
-			desc->psy_fuel_gauge);
-		return -ENODEV;
+	if (desc->fuel_gauge) {
+		cm->fuel_gauge = desc->fuel_gauge;
+	} else {
+		cm->fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
+		if (!cm->fuel_gauge) {
+			dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
+					desc->psy_fuel_gauge);
+			return -ENODEV;
+		}
 	}
 
 	if (desc->polling_interval_ms == 0 ||
diff --git a/include/linux/power/charger-manager.h b/include/linux/power/charger-manager.h
index 07e7945..92cc47a 100644
--- a/include/linux/power/charger-manager.h
+++ b/include/linux/power/charger-manager.h
@@ -175,6 +175,7 @@ struct charger_regulator {
  * @num_charger_regulator: the number of entries in charger_regulators
  * @charger_regulators: array of charger regulators
  * @psy_fuel_gauge: the name of power-supply for fuel gauge
+ * @fuel_gauge: power_supply device for fuel gauge
  * @thermal_zone : the name of thermal zone for battery
  * @temp_min : Minimum battery temperature for charging.
  * @temp_max : Maximum battery temperature for charging.
@@ -210,6 +211,7 @@ struct charger_desc {
 	struct charger_regulator *charger_regulators;
 
 	const char *psy_fuel_gauge;
+	struct power_supply *fuel_gauge;
 
 	const char *thermal_zone;
 
-- 
1.8.0

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