linux-kernel - Re: [PATCH 7/13] drivers/mmc/host/mmci.c: use clk_prepare_enable and clk_disable

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Date:	Mon, 27 Aug 2012 14:55:11 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Ulf Hansson <ulf.hansson@...aro.org>
cc:	Julia Lawall <Julia.Lawall@...6.fr>, Chris Ball <cjb@...top.org>,
	kernel-janitors@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH 7/13] drivers/mmc/host/mmci.c: use clk_prepare_enable
 and clk_disable_unprepare

From: Julia Lawall <Julia.Lawall@...6.fr>

Simplify clock code in probe.

A simplified version of the semantic patch that introduces calls to these
functions is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
@@

- clk_prepare(e);
- clk_enable(e);
+ clk_prepare_enable(e);

@@
expression e;
@@

- clk_disable(e);
- clk_unprepare(e);
+ clk_disable_unprepare(e);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
v2, try to avoid whitespace problem

 drivers/mmc/host/mmci.c |   13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 50ff19a..edc3e9b 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1309,14 +1309,10 @@ static int __devinit mmci_probe(struct amba_device *dev,
 		goto host_free;
 	}

-	ret = clk_prepare(host->clk);
+	ret = clk_prepare_enable(host->clk);
 	if (ret)
 		goto clk_free;

-	ret = clk_enable(host->clk);
-	if (ret)
-		goto clk_unprep;
-
 	host->plat = plat;
 	host->variant = variant;
 	host->mclk = clk_get_rate(host->clk);
@@ -1515,9 +1511,7 @@ static int __devinit mmci_probe(struct amba_device *dev,
  err_gpio_cd:
 	iounmap(host->base);
  clk_disable:
-	clk_disable(host->clk);
- clk_unprep:
-	clk_unprepare(host->clk);
+	clk_disable_unprepare(host->clk);
  clk_free:
 	clk_put(host->clk);
  host_free:
@@ -1564,8 +1558,7 @@ static int __devexit mmci_remove(struct amba_device *dev)
 			gpio_free(host->gpio_cd);

 		iounmap(host->base);
-		clk_disable(host->clk);
-		clk_unprepare(host->clk);
+		clk_disable_unprepare(host->clk);
 		clk_put(host->clk);

 		if (host->vcc)

--
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