max8925_power: Add support for device-tree initialization

This patch adds support for initializing platform data from the
device-tree description.

Signed-off-by: Qing Xu <qingx@marvell.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

drivers/power/max8925_power.c

@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/slab.h>
+#include <linux/of.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
@@ -426,6 +427,54 @@ static __devexit int max8925_deinit_charger(struct max8925_power_info *info)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static struct max8925_power_pdata *
+max8925_power_dt_init(struct platform_device *pdev)
+{
+	struct device_node *nproot = pdev->dev.parent->of_node;
+	struct device_node *np;
+	int batt_detect;
+	int topoff_threshold;
+	int fast_charge;
+	int no_temp_support;
+	int no_insert_detect;
+	struct max8925_power_pdata *pdata;
+
+	if (!nproot)
+		return pdev->dev.platform_data;
+
+	np = of_find_node_by_name(nproot, "charger");
+	if (!np) {
+		dev_err(&pdev->dev, "failed to find charger node\n");
+		return NULL;
+	}
+
+	pdata = devm_kzalloc(&pdev->dev,
+			sizeof(struct max8925_power_pdata),
+			GFP_KERNEL);
+
+	of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
+	of_property_read_u32(np, "batt-detect", &batt_detect);
+	of_property_read_u32(np, "fast-charge", &fast_charge);
+	of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
+	of_property_read_u32(np, "no-temp-support", &no_temp_support);
+
+	pdata->batt_detect = batt_detect;
+	pdata->fast_charge = fast_charge;
+	pdata->topoff_threshold = topoff_threshold;
+	pdata->no_insert_detect = no_insert_detect;
+	pdata->no_temp_support = no_temp_support;
+
+	return pdata;
+}
+#else
+static struct max8925_power_pdata *
+max8925_power_dt_init(struct platform_device *pdev)
+{
+	return pdev->dev.platform_data;
+}
+#endif
+
 static __devinit int max8925_power_probe(struct platform_device *pdev)
 {
 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
@@ -433,7 +482,7 @@ static __devinit int max8925_power_probe(struct platform_device *pdev)
 	struct max8925_power_info *info;
 	int ret;
 
-	pdata = pdev->dev.platform_data;
+	pdata = max8925_power_dt_init(pdev);
 	if (!pdata) {
 		dev_err(&pdev->dev, "platform data isn't assigned to "
 			"power supply\n");