[PATCH] mtd: add setup/teardown callbacks to plat_nand

[hartleys]

Add optional setup and teardown callbacks to the plat_nand driver.

Some platforms may require additional setup, such as configuring the
memory controller, before the nand device can be accessed.  This patch
provides an optional callback to handle this setup as well as a callback
to teardown the setup.

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>

---

diff --git a/drivers/mtd/nand/plat_nand.c b/drivers/mtd/nand/plat_nand.c
index 75f9f48..81b4919 100644
--- a/drivers/mtd/nand/plat_nand.c
+++ b/drivers/mtd/nand/plat_nand.c
@@ -70,6 +70,13 @@ static int __init plat_nand_probe(struct
platform_device *pdev)
 
 	platform_set_drvdata(pdev, data);
 
+	/* Handle any platform specific setup */
+	if (pdata->ctrl.setup) {
+		res = pdata->ctrl.setup(pdev);
+		if (res)
+			goto out;
+	}
+
 	/* Scan to find existance of the device */
 	if (nand_scan(&data->mtd, 1)) {
 		res = -ENXIO;
@@ -99,6 +106,8 @@ static int __init plat_nand_probe(struct
platform_device *pdev)
 
 	nand_release(&data->mtd);
 out:
+	if (pdata->ctrl.teardown)
+		pdata->ctrl.teardown(pdev);
 	platform_set_drvdata(pdev, NULL);
 	iounmap(data->io_base);
 	kfree(data);
@@ -111,15 +120,15 @@ out:
 static int __devexit plat_nand_remove(struct platform_device *pdev)
 {
 	struct plat_nand_data *data = platform_get_drvdata(pdev);
-#ifdef CONFIG_MTD_PARTITIONS
 	struct platform_nand_data *pdata = pdev->dev.platform_data;
-#endif
 
 	nand_release(&data->mtd);
 #ifdef CONFIG_MTD_PARTITIONS
 	if (data->parts && data->parts != pdata->chip.partitions)
 		kfree(data->parts);
 #endif
+	if (pdata->ctrl.teardown)
+		pdata->ctrl.teardown(pdev);
 	iounmap(data->io_base);
 	kfree(data);
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index db5b63d..5ca8f5e 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -579,6 +579,8 @@ struct platform_nand_chip {
 
 /**
  * struct platform_nand_ctrl - controller level device structure
+ * @setup:		platform specific function to setup hardware
+ * @teardown:		platform specific function to teardown hardware
  * @hwcontrol:		platform specific hardware control structure
  * @dev_ready:		platform specific function to read ready/busy
pin
  * @select_chip:	platform specific chip select function
@@ -589,6 +591,8 @@ struct platform_nand_chip {
  * All fields are optional and depend on the hardware driver
requirements
  */
 struct platform_nand_ctrl {
+	int		(*setup)(struct platform_device *pdev);
+	void		(*teardown)(struct platform_device *pdev);
 	void		(*hwcontrol)(struct mtd_info *mtd, int cmd);
 	int		(*dev_ready)(struct mtd_info *mtd);
 	void		(*select_chip)(struct mtd_info *mtd, int chip);