crypto: mxs-dcp - Use the devm_clk_get_optional_enabled() helper

Use devm_clk_get_optional_enabled() instead of hand writing it.
This saves some loC and improves the semantic.

update the error handling path and the remove function accordingly.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/mxs-dcp.c

@@ -1022,21 +1022,15 @@ static int mxs_dcp_probe(struct platform_device *pdev)
 	sdcp->coh = PTR_ALIGN(sdcp->coh, DCP_ALIGNMENT);
 
 	/* DCP clock is optional, only used on some SOCs */
-	sdcp->dcp_clk = devm_clk_get(dev, "dcp");
-	if (IS_ERR(sdcp->dcp_clk)) {
-		if (sdcp->dcp_clk != ERR_PTR(-ENOENT))
-			return PTR_ERR(sdcp->dcp_clk);
-		sdcp->dcp_clk = NULL;
-	}
-	ret = clk_prepare_enable(sdcp->dcp_clk);
-	if (ret)
-		return ret;
+	sdcp->dcp_clk = devm_clk_get_optional_enabled(dev, "dcp");
+	if (IS_ERR(sdcp->dcp_clk))
+		return PTR_ERR(sdcp->dcp_clk);
 
 	/* Restart the DCP block. */
 	ret = stmp_reset_block(sdcp->base);
 	if (ret) {
 		dev_err(dev, "Failed reset\n");
-		goto err_disable_unprepare_clk;
+		return ret;
 	}
 
 	/* Initialize control register. */
@@ -1076,7 +1070,7 @@ static int mxs_dcp_probe(struct platform_device *pdev)
 	if (IS_ERR(sdcp->thread[DCP_CHAN_HASH_SHA])) {
 		dev_err(dev, "Error starting SHA thread!\n");
 		ret = PTR_ERR(sdcp->thread[DCP_CHAN_HASH_SHA]);
-		goto err_disable_unprepare_clk;
+		return ret;
 	}
 
 	sdcp->thread[DCP_CHAN_CRYPTO] = kthread_run(dcp_chan_thread_aes,
@@ -1134,9 +1128,6 @@ static int mxs_dcp_probe(struct platform_device *pdev)
 err_destroy_sha_thread:
 	kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]);
 
-err_disable_unprepare_clk:
-	clk_disable_unprepare(sdcp->dcp_clk);
-
 	return ret;
 }
 
@@ -1156,8 +1147,6 @@ static int mxs_dcp_remove(struct platform_device *pdev)
 	kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]);
 	kthread_stop(sdcp->thread[DCP_CHAN_CRYPTO]);
 
-	clk_disable_unprepare(sdcp->dcp_clk);
-
 	platform_set_drvdata(pdev, NULL);
 
 	global_sdcp = NULL;