From: Arve Hjønnevåg <arve@android.com>
Date: Sat, 29 Jan 2011 07:12:32 +0000 (-0800)
Subject: ARM: etm: Don't require clock control
X-Git-Tag: v3.0.35-fsl~442
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=80d4952ba4b3d1818cdca6b15cc0807d1d2322f1;p=karo-tx-linux.git

ARM: etm: Don't require clock control

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

Change-Id: Ia0bf3f5391e94a60ea45876aa7afc8a88a7ec3bf
Signed-off-by: Arve Hjønnevåg <arve@android.com>
---

diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c
index 1bec8b5f22f0..9c96b5f5614e 100644
--- a/arch/arm/kernel/etm.c
+++ b/arch/arm/kernel/etm.c
@@ -361,13 +361,12 @@ static int __devinit etb_probe(struct amba_device *dev, const 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);