linux-kernel - [V2 PATCH 1/2] rtc: sa1100: move clock enable/disable to probe/remove

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Date:	Wed,  5 Dec 2012 01:49:08 -0500
From:	Chao Xie <chao.xie@...vell.com>
To:	haojian.zhuang@...il.com, xiechao.mail@...il.com,
	linux@....linux.org.uk, a.zummo@...ertech.it,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead, robert.jarzmik@...e.fr
Cc:	Chao Xie <chao.xie@...vell.com>
Subject: [V2 PATCH 1/2] rtc: sa1100: move clock enable/disable to probe/remove

The original sa1100_rtc_open/sa1100_rtc_release will be called
when the /dev/rtc0 is opened or closed.
In fact, these two functions will enable/disable the clock.
Disabling clock will make rtc not work.
So only enable/disable clock when probe/remove the device.

Signed-off-by: Chao Xie <chao.xie@...vell.com>
---
 drivers/rtc/rtc-sa1100.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index 50a5c4a..34f66b8 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -108,9 +108,6 @@ static int sa1100_rtc_open(struct device *dev)
 	struct rtc_device *rtc = info->rtc;
 	int ret;
 
-	ret = clk_prepare_enable(info->clk);
-	if (ret)
-		goto fail_clk;
 	ret = request_irq(info->irq_1hz, sa1100_rtc_interrupt, 0, "rtc 1Hz", dev);
 	if (ret) {
 		dev_err(dev, "IRQ %d already in use.\n", info->irq_1hz);
@@ -130,7 +127,6 @@ static int sa1100_rtc_open(struct device *dev)
 	free_irq(info->irq_1hz, dev);
  fail_ui:
 	clk_disable_unprepare(info->clk);
- fail_clk:
 	return ret;
 }
 
@@ -144,7 +140,6 @@ static void sa1100_rtc_release(struct device *dev)
 
 	free_irq(info->irq_alarm, dev);
 	free_irq(info->irq_1hz, dev);
-	clk_disable_unprepare(info->clk);
 }
 
 static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
@@ -253,6 +248,9 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
 	spin_lock_init(&info->lock);
 	platform_set_drvdata(pdev, info);
 
+	ret = clk_prepare_enable(info->clk);
+	if (ret)
+		goto err_enable_clk;
 	/*
 	 * According to the manual we should be able to let RTTR be zero
 	 * and then a default diviser for a 32.768KHz clock is used.
@@ -305,6 +303,8 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
 
 	return 0;
 err_dev:
+	clk_disable_unprepare(info->clk);
+err_enable_clk:
 	platform_set_drvdata(pdev, NULL);
 	clk_put(info->clk);
 err_clk:
@@ -318,6 +318,7 @@ static int sa1100_rtc_remove(struct platform_device *pdev)
 
 	if (info) {
 		rtc_device_unregister(info->rtc);
+		clk_disable_unprepare(info->clk);
 		clk_put(info->clk);
 		platform_set_drvdata(pdev, NULL);
 		kfree(info);
-- 
1.7.4.1

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