of/i2c: Generalize OF support

This patch cleans up the i2c OF support code to make it selectable by
all architectures and allow for automatic registration of i2c devices.

Signed-off-by: Grant Likely <[e-mail]>

drivers/i2c/busses/i2c-cpm.c

···
 	cpm->adap = cpm_ops;
 	i2c_set_adapdata(&cpm->adap, cpm);
 	cpm->adap.dev.parent = &ofdev->dev;
+	cpm->adap.dev.of_node = of_node_get(ofdev->dev.of_node);
 
 	result = cpm_i2c_setup(cpm);
 	if (result) {
···
 	/*
 	 * register OF I2C devices
 	 */
-	of_register_i2c_devices(&cpm->adap, ofdev->dev.of_node);
+	of_i2c_register_devices(&cpm->adap);
 
 	return 0;
 out_shut:

drivers/i2c/busses/i2c-ibm_iic.c

···
 	/* Register it with i2c layer */
 	adap = &dev->adap;
 	adap->dev.parent = &ofdev->dev;
+	adap->dev.of_node = of_node_get(np);
 	strlcpy(adap->name, "IBM IIC", sizeof(adap->name));
 	i2c_set_adapdata(adap, dev);
 	adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
···
 		 dev->fast_mode ? "fast (400 kHz)" : "standard (100 kHz)");
 
 	/* Now register all the child nodes */
-	of_register_i2c_devices(adap, np);
+	of_i2c_register_devices(adap);
 
 	return 0;
 

drivers/i2c/busses/i2c-mpc.c

···
 	i2c->adap = mpc_ops;
 	i2c_set_adapdata(&i2c->adap, i2c);
 	i2c->adap.dev.parent = &op->dev;
+	i2c->adap.dev.of_node = of_node_get(op->dev.of_node);
 
 	result = i2c_add_adapter(&i2c->adap);
 	if (result < 0) {
 		dev_err(i2c->dev, "failed to add adapter\n");
 		goto fail_add;
 	}
-	of_register_i2c_devices(&i2c->adap, op->dev.of_node);
+	of_i2c_register_devices(&i2c->adap);
 
 	return result;
 

drivers/of/Kconfig

···
 
 config OF_I2C
 	def_tristate I2C
-	depends on (PPC_OF || MICROBLAZE) && I2C
+	depends on OF && !SPARC && I2C
 	help
 	  OpenFirmware I2C accessors
 

drivers/of/of_i2c.c

···
 #include <linux/i2c.h>
 #include <linux/of.h>
 #include <linux/of_i2c.h>
+#include <linux/of_irq.h>
 #include <linux/module.h>
 
-void of_register_i2c_devices(struct i2c_adapter *adap,
-			     struct device_node *adap_node)
+void of_i2c_register_devices(struct i2c_adapter *adap)
 {
 	void *result;
 	struct device_node *node;
 
-	for_each_child_of_node(adap_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_child_of_node(adap->dev.of_node, node) {
 		struct i2c_board_info info = {};
 		struct dev_archdata dev_ad = {};
 		const __be32 *addr;
 		int len;
 
-		if (of_modalias_node(node, info.type, sizeof(info.type)) < 0)
+		dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
+
+		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;
+		}
 
 		addr = of_get_property(node, "reg", &len);
-		if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) {
-			printk(KERN_ERR
-			       "of-i2c: invalid i2c device entry\n");
+		if (!addr || (len < sizeof(int))) {
+			dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
+				node->full_name);
+			continue;
+		}
+
+		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;
 		}
 
 		info.irq = irq_of_parse_and_map(node, 0);
-
-		info.addr = be32_to_cpup(addr);
-
-		info.of_node = node;
+		info.of_node = of_node_get(node);
 		info.archdata = &dev_ad;
 
 		request_module("%s", info.type);
 
 		result = i2c_new_device(adap, &info);
 		if (result == NULL) {
-			printk(KERN_ERR
-			       "of-i2c: Failed to load driver for %s\n",
-			       info.type);
+			dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
+			        node->full_name);
+			of_node_put(node);
 			irq_dispose_mapping(info.irq);
 			continue;
 		}
-
-		/*
-		 * Get the node to not lose the dev_archdata->of_node.
-		 * Currently there is no way to put it back, as well as no
-		 * of_unregister_i2c_devices() call.
-		 */
-		of_node_get(node);
 	}
 }
-EXPORT_SYMBOL(of_register_i2c_devices);
+EXPORT_SYMBOL(of_i2c_register_devices);
 
 static int of_dev_node_match(struct device *dev, void *data)
 {

include/linux/of_i2c.h

···
 #ifndef __LINUX_OF_I2C_H
 #define __LINUX_OF_I2C_H
 
+#if defined(CONFIG_OF_I2C) || defined(CONFIG_OF_I2C_MODULE)
 #include <linux/i2c.h>
 
-void of_register_i2c_devices(struct i2c_adapter *adap,
-			     struct device_node *adap_node);
+extern void of_i2c_register_devices(struct i2c_adapter *adap);
 
 /* must call put_device() when done with returned i2c_client device */
-struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);
+extern struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);
+
+#else
+static inline void of_i2c_register_devices(struct i2c_adapter *adap)
+{
+	return;
+}
+#endif /* CONFIG_OF_I2C */
 
 #endif /* __LINUX_OF_I2C_H */