[PATCH v3] leds: pca955x: Make use of device property API

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

Make use of device property API in this driver so that both OF based
system and ACPI based system can use this driver.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
- leave IDs where they were in the code

 drivers/leds/leds-pca955x.c | 35 +++++++++++++----------------------
 1 file changed, 13 insertions(+), 22 deletions(-)

diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
index f023729353b5..a9f5dad55956 100644
--- a/drivers/leds/leds-pca955x.c
+++ b/drivers/leds/leds-pca955x.c
@@ -47,8 +47,8 @@
 #include <linux/i2c.h>
 #include <linux/leds.h>
 #include <linux/module.h>
-#include <linux/of_device.h>
 #include <linux/of.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 
@@ -363,16 +363,14 @@ static int pca955x_gpio_direction_output(struct gpio_chip *gc,
 }
 #endif /* CONFIG_LEDS_PCA955X_GPIO */
 
-#if IS_ENABLED(CONFIG_OF)
 static struct pca955x_platform_data *
-pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
+pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 {
-	struct device_node *np = client->dev.of_node;
-	struct device_node *child;
 	struct pca955x_platform_data *pdata;
+	struct fwnode_handle *child;
 	int count;
 
-	count = of_get_child_count(np);
+	count = device_get_child_node_count(&client->dev);
 	if (!count || count > chip->bits)
 		return ERR_PTR(-ENODEV);
 
@@ -386,24 +384,25 @@ pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
 	if (!pdata->leds)
 		return ERR_PTR(-ENOMEM);
 
-	for_each_child_of_node(np, child) {
+	device_for_each_child_node(&client->dev, child) {
 		const char *name;
 		u32 reg;
 		int res;
 
-		res = of_property_read_u32(child, "reg", &reg);
+		res = fwnode_property_read_u32(child, "reg", &reg);
 		if ((res != 0) || (reg >= chip->bits))
 			continue;
 
-		if (of_property_read_string(child, "label", &name))
-			name = child->name;
+		res = fwnode_property_read_string(child, "label", &name);
+		if ((res != 0) && is_of_node(child))
+			name = to_of_node(child)->name;
 
 		snprintf(pdata->leds[reg].name, sizeof(pdata->leds[reg].name),
 			 "%s", name);
 
 		pdata->leds[reg].type = PCA955X_TYPE_LED;
-		of_property_read_u32(child, "type", &pdata->leds[reg].type);
-		of_property_read_string(child, "linux,default-trigger",
+		fwnode_property_read_u32(child, "type", &pdata->leds[reg].type);
+		fwnode_property_read_string(child, "linux,default-trigger",
 					&pdata->leds[reg].default_trigger);
 	}
 
@@ -419,15 +418,7 @@ static const struct of_device_id of_pca955x_match[] = {
 	{ .compatible = "nxp,pca9553", .data = (void *)pca9553 },
 	{},
 };
-
 MODULE_DEVICE_TABLE(of, of_pca955x_match);
-#else
-static struct pca955x_platform_data *
-pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
-{
-	return ERR_PTR(-ENODEV);
-}
-#endif
 
 static int pca955x_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
@@ -444,7 +435,7 @@ static int pca955x_probe(struct i2c_client *client,
 	adapter = to_i2c_adapter(client->dev.parent);
 	pdata = dev_get_platdata(&client->dev);
 	if (!pdata) {
-		pdata =	pca955x_pdata_of_init(client, chip);
+		pdata =	pca955x_get_pdata(client, chip);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 	}
@@ -583,7 +574,7 @@ static int pca955x_probe(struct i2c_client *client,
 static struct i2c_driver pca955x_driver = {
 	.driver = {
 		.name	= "leds-pca955x",
-		.of_match_table = of_match_ptr(of_pca955x_match),
+		.of_match_table = of_pca955x_match,
 	},
 	.probe	= pca955x_probe,
 	.id_table = pca955x_id,
-- 
2.20.1