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 <grant.likely@secretlab.ca>

6 files changed, 46 insertions, 28 deletions

diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
index b02b4533651d..03ae62e69596 100644
--- a/drivers/i2c/busses/i2c-cpm.c
+++ b/drivers/i2c/busses/i2c-cpm.c
@@ -652,6 +652,7 @@ static int __devinit cpm_i2c_probe(struct of_device *ofdev,
         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) {
@@ -679,7 +680,7 @@ static int __devinit cpm_i2c_probe(struct of_device *ofdev,
         /*
          * register OF I2C devices
          */
-        of_register_i2c_devices(&cpm->adap, ofdev->dev.of_node);
+        of_i2c_register_devices(&cpm->adap);
 
         return 0;
 out_shut:
diff --git a/drivers/i2c/busses/i2c-ibm_iic.c b/drivers/i2c/busses/i2c-ibm_iic.c
index bf344135647a..d9641210dd3a 100644
--- a/drivers/i2c/busses/i2c-ibm_iic.c
+++ b/drivers/i2c/busses/i2c-ibm_iic.c
@@ -745,6 +745,7 @@ static int __devinit iic_probe(struct of_device *ofdev,
         /* 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;
@@ -761,7 +762,7 @@ static int __devinit iic_probe(struct of_device *ofdev,
                  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;
 
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index df00eb1f11f9..d2e26d290e7a 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -600,13 +600,14 @@ static int __devinit fsl_i2c_probe(struct of_device *op,
         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;
 
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 097f42aebe90..80dd6318db68 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -26,7 +26,7 @@ config OF_GPIO
 
 config OF_I2C
         def_tristate I2C
-        depends on (PPC_OF || MICROBLAZE) && I2C
+        depends on OF && !SPARC && I2C
         help
           OpenFirmware I2C accessors
 
diff --git a/drivers/of/of_i2c.c b/drivers/of/of_i2c.c
index ab6522c8e4fe..0a694debd226 100644
--- a/drivers/of/of_i2c.c
+++ b/drivers/of/of_i2c.c
@@ -14,57 +14,65 @@
 #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.irq = irq_of_parse_and_map(node, 0);
-
                 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.of_node = node;
+                info.irq = irq_of_parse_and_map(node, 0);
+                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)
 {
diff --git a/include/linux/of_i2c.h b/include/linux/of_i2c.h
index 34974b5a76f7..0efe8d465f55 100644
--- a/include/linux/of_i2c.h
+++ b/include/linux/of_i2c.h
@@ -12,12 +12,19 @@
 #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 */