[PATCH v3 04/31] mtd: mpc5121_nfc: cleanup clock API use

[Gerhard Sittig]

prepare before enable isn't optional, do check for and propagate clock
setup errors, adjust error code paths to correctly balance get/put and
prepare/unprepare and enable/disable, use devm_{get,put}_clk()

Signed-off-by: Gerhard Sittig <gsi at denx.de>
---
 drivers/mtd/nand/mpc5121_nfc.c |   20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/mtd/nand/mpc5121_nfc.c b/drivers/mtd/nand/mpc5121_nfc.c
index 3c9cdcb..9c0b8fe 100644
--- a/drivers/mtd/nand/mpc5121_nfc.c
+++ b/drivers/mtd/nand/mpc5121_nfc.c
@@ -618,8 +618,8 @@ static void mpc5121_nfc_free(struct device *dev, struct mtd_info *mtd)
 	struct mpc5121_nfc_prv *prv = chip->priv;
 
 	if (prv->clk) {
-		clk_disable(prv->clk);
-		clk_put(prv->clk);
+		clk_disable_unprepare(prv->clk);
+		devm_clk_put(dev, prv->clk);
 	}
 
 	if (prv->csreg)
@@ -629,6 +629,7 @@ static void mpc5121_nfc_free(struct device *dev, struct mtd_info *mtd)
 static int mpc5121_nfc_probe(struct platform_device *op)
 {
 	struct device_node *rootnode, *dn = op->dev.of_node;
+	struct clk *clk;
 	struct device *dev = &op->dev;
 	struct mpc5121_nfc_prv *prv;
 	struct resource res;
@@ -730,14 +731,19 @@ static int mpc5121_nfc_probe(struct platform_device *op)
 	of_node_put(rootnode);
 
 	/* Enable NFC clock */
-	prv->clk = clk_get(dev, "nfc_clk");
-	if (IS_ERR(prv->clk)) {
+	clk = devm_clk_get(dev, "nfc_clk");
+	if (IS_ERR(clk)) {
 		dev_err(dev, "Unable to acquire NFC clock!\n");
-		retval = PTR_ERR(prv->clk);
+		retval = PTR_ERR(clk);
 		goto error;
 	}
-
-	clk_enable(prv->clk);
+	retval = clk_prepare_enable(clk);
+	if (retval) {
+		dev_err(dev, "Unable to enable NFC clock!\n");
+		devm_clk_put(dev, clk);
+		goto error;
+	}
+	prv->clk = clk;
 
 	/* Reset NAND Flash controller */
 	nfc_set(mtd, NFC_CONFIG1, NFC_RESET);
-- 
1.7.10.4