Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "Mostly slight adjusments for new drivers, but also one core fix for
  which finally the dependencies are now available as well"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: Mark instantiated device nodes with OF_POPULATE
  i2c: jz4780: Fix return value if probe fails
  i2c: xgene-slimpro: Fix missing mbox_free_channel call in probe error path
  i2c: I2C_MT65XX should depend on HAS_DMA

drivers/i2c/busses/Kconfig

@@ -633,6 +633,7 @@ config I2C_MPC
 config I2C_MT65XX
 	tristate "MediaTek I2C adapter"
 	depends on ARCH_MEDIATEK || COMPILE_TEST
+	depends on HAS_DMA
 	help
 	  This selects the MediaTek(R) Integrated Inter Circuit bus driver
 	  for MT65xx and MT81xx.

drivers/i2c/busses/i2c-jz4780.c

@@ -764,12 +764,15 @@ static int jz4780_i2c_probe(struct platform_device *pdev)
 	if (IS_ERR(i2c->clk))
 		return PTR_ERR(i2c->clk);
 
-	clk_prepare_enable(i2c->clk);
+	ret = clk_prepare_enable(i2c->clk);
+	if (ret)
+		return ret;
 
-	if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+	ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
-				 &clk_freq)) {
+				   &clk_freq);
+	if (ret) {
 		dev_err(&pdev->dev, "clock-frequency not specified in DT");
-		return clk_freq;
+		goto err;
 	}
 
 	i2c->speed = clk_freq / 1000;
@@ -790,10 +793,8 @@ static int jz4780_i2c_probe(struct platform_device *pdev)
 	i2c->irq = platform_get_irq(pdev, 0);
 	ret = devm_request_irq(&pdev->dev, i2c->irq, jz4780_i2c_irq, 0,
 			       dev_name(&pdev->dev), i2c);
-	if (ret) {
+	if (ret)
-		ret = -ENODEV;
 		goto err;
-	}
 
 	ret = i2c_add_adapter(&i2c->adap);
 	if (ret < 0) {

drivers/i2c/busses/i2c-xgene-slimpro.c

@@ -419,6 +419,7 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
 	rc = i2c_add_adapter(adapter);
 	if (rc) {
 		dev_err(&pdev->dev, "Adapter registeration failed\n");
+		mbox_free_channel(ctx->mbox_chan);
 		return rc;
 	}
 

drivers/i2c/i2c-core.c

@@ -1012,6 +1012,8 @@ EXPORT_SYMBOL_GPL(i2c_new_device);
  */
 void i2c_unregister_device(struct i2c_client *client)
 {
+	if (client->dev.of_node)
+		of_node_clear_flag(client->dev.of_node, OF_POPULATED);
 	device_unregister(&client->dev);
 }
 EXPORT_SYMBOL_GPL(i2c_unregister_device);
@@ -1320,8 +1322,11 @@ static void of_i2c_register_devices(struct i2c_adapter *adap)
 
 	dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
 
-	for_each_available_child_of_node(adap->dev.of_node, node)
+	for_each_available_child_of_node(adap->dev.of_node, node) {
+		if (of_node_test_and_set_flag(node, OF_POPULATED))
+			continue;
 		of_i2c_register_device(adap, node);
+	}
 }
 
 static int of_dev_node_match(struct device *dev, void *data)
@@ -1853,6 +1858,11 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action,
 		if (adap == NULL)
 			return NOTIFY_OK;	/* not for us */
 
+		if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) {
+			put_device(&adap->dev);
+			return NOTIFY_OK;
+		}
+
 		client = of_i2c_register_device(adap, rd->dn);
 		put_device(&adap->dev);
 
@@ -1863,6 +1873,10 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action,
 		}
 		break;
 	case OF_RECONFIG_CHANGE_REMOVE:
+		/* already depopulated? */
+		if (!of_node_check_flag(rd->dn, OF_POPULATED))
+			return NOTIFY_OK;
+
 		/* find our device by node */
 		client = of_find_i2c_device_by_node(rd->dn);
 		if (client == NULL)