i2c/of: Factor out Devicetree registration code

Dynamically inserting i2c client device nodes requires the use
of a single device registration method. Factor out the loop body of
of_i2c_register_devices() so that it can be called for individual
device_nodes instead of for all the children of a node.

Note: The diff of this commit looks far more complicated than it
actually is due the indentation being changed for a large block of code.
When viewed using the diff -w flag to ignore whitespace changes it can
be seen that the change is actually quite simple.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
[grant.likely: Made new function static and removed changes to header]
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-i2c@vger.kernel.org

drivers/i2c/i2c-core.c

@@ -49,6 +49,7 @@
 #include <linux/acpi.h>
 #include <linux/jump_label.h>
 #include <asm/uaccess.h>
+#include <linux/err.h>
 
 #include "i2c-core.h"
 
@@ -1368,18 +1369,10 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
 /* OF support code */
 
 #if IS_ENABLED(CONFIG_OF)
-static void of_i2c_register_devices(struct i2c_adapter *adap)
+static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
+						 struct device_node *node)
 {
-	void *result;
+	struct i2c_client *result;
-	struct device_node *node;
-
-	/* Only register child devices if the adapter has a node pointer set */
-	if (!adap->dev.of_node)
-		return;
-
-	dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
-
-	for_each_available_child_of_node(adap->dev.of_node, node) {
 	struct i2c_board_info info = {};
 	struct dev_archdata dev_ad = {};
 	const __be32 *addr;
@@ -1390,21 +1383,21 @@ static void of_i2c_register_devices(struct i2c_adapter *adap)
 	if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
 		dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
 			node->full_name);
-			continue;
+		return ERR_PTR(-EINVAL);
 	}
 
 	addr = of_get_property(node, "reg", &len);
 	if (!addr || (len < sizeof(int))) {
 		dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
 			node->full_name);
-			continue;
+		return ERR_PTR(-EINVAL);
 	}
 
 	info.addr = be32_to_cpup(addr);
 	if (info.addr > (1 << 10) - 1) {
 		dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
 			info.addr, node->full_name);
-			continue;
+		return ERR_PTR(-EINVAL);
 	}
 
 	info.irq = irq_of_parse_and_map(node, 0);
@@ -1422,9 +1415,23 @@ static void of_i2c_register_devices(struct i2c_adapter *adap)
 			node->full_name);
 		of_node_put(node);
 		irq_dispose_mapping(info.irq);
-			continue;
+		return ERR_PTR(-EINVAL);
 	}
+	return result;
 }
+
+static void of_i2c_register_devices(struct i2c_adapter *adap)
+{
+	struct device_node *node;
+
+	/* Only register child devices if the adapter has a node pointer set */
+	if (!adap->dev.of_node)
+		return;
+
+	dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
+
+	for_each_available_child_of_node(adap->dev.of_node, node)
+		of_i2c_register_device(adap, node);
 }
 
 static int of_dev_node_match(struct device *dev, void *data)