linux-kernel - [PATCH 1/8] ARM: etm: Don't require clock control

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Message-Id: <1297750276-12475-1-git-send-email-arve@android.com>
Date:	Mon, 14 Feb 2011 22:11:09 -0800
From:	Arve Hjønnevåg <arve@...roid.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-omap@...r.kernel.org,
	Arve Hjønnevåg <arve@...roid.com>,
	Russell King <linux@....linux.org.uk>,
	Alexander Shishkin <virtuoso@...nd.org>,
	Jason Wessel <jason.wessel@...driver.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/8] ARM: etm: Don't require clock control

If clk_get fail, assume the etb does not need a separate clock.

Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
---
 arch/arm/kernel/etm.c |   15 ++++++++-------
 1 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c
index 11db628..d4ec368 100644
--- a/arch/arm/kernel/etm.c
+++ b/arch/arm/kernel/etm.c
@@ -361,13 +361,12 @@ static int __init etb_probe(struct amba_device *dev, struct amba_id *id)
 	if (ret)
 		goto out_unmap;
 
+	/* Get optional clock. Currently used to select clock source on omap3 */
 	t->emu_clk = clk_get(&dev->dev, "emu_src_ck");
-	if (IS_ERR(t->emu_clk)) {
+	if (IS_ERR(t->emu_clk))
 		dev_dbg(&dev->dev, "Failed to obtain emu_src_ck.\n");
-		return -EFAULT;
-	}
-
-	clk_enable(t->emu_clk);
+	else
+		clk_enable(t->emu_clk);
 
 	etb_unlock(t);
 	t->etb_bufsz = etb_readl(t, ETBR_DEPTH);
@@ -402,8 +401,10 @@ static int etb_remove(struct amba_device *dev)
 	iounmap(t->etb_regs);
 	t->etb_regs = NULL;
 
-	clk_disable(t->emu_clk);
-	clk_put(t->emu_clk);
+	if (!IS_ERR(t->emu_clk)) {
+		clk_disable(t->emu_clk);
+		clk_put(t->emu_clk);
+	}
 
 	amba_release_regions(dev);
 
-- 
1.7.3.1

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