linux-kernel - [PATCH 1/6 v3] arm: use devicetree to get smp

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Message-Id: <1352233089-22586-2-git-send-email-mark.langsdorf@calxeda.com>
Date:	Tue,  6 Nov 2012 14:18:03 -0600
From:	Mark Langsdorf <mark.langsdorf@...xeda.com>
To:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	cpufreq@...r.kernel.org, mark.langsdorf@...xeda.com
Cc:	Rob Herring <rob.herring@...xeda.com>
Subject: [PATCH 1/6 v3] arm: use devicetree to get smp_twd clock

From: Rob Herring <rob.herring@...xeda.com>

Signed-off-by: Rob Herring <rob.herring@...xeda.com>
Signed-off-by: Mark Langsdorf <mark.langsdorf@...xeda.com>

---
Changes from v2
	Turned the check for the node pointer into an if-then-else statement.
	Removed the second, redundant clk_get_rate
Changes from v1
        None.

 arch/arm/kernel/smp_twd.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index b22d700..b1fb6e1 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -237,12 +237,15 @@ static irqreturn_t twd_handler(int irq, void *dev_id)
 	return IRQ_NONE;
 }
 
-static struct clk *twd_get_clock(void)
+static struct clk *twd_get_clock(struct device_node *np)
 {
-	struct clk *clk;
+	struct clk *clk = NULL;
 	int err;
 
-	clk = clk_get_sys("smp_twd", NULL);
+	if (np)
+		clk = of_clk_get(np, 0);
+	else
+		clk = clk_get_sys("smp_twd", NULL);
 	if (IS_ERR(clk)) {
 		pr_err("smp_twd: clock not found: %d\n", (int)PTR_ERR(clk));
 		return clk;
@@ -263,6 +266,7 @@ static struct clk *twd_get_clock(void)
 		return ERR_PTR(err);
 	}
 
+	twd_timer_rate = clk_get_rate(clk);
 	return clk;
 }
 
@@ -273,12 +277,7 @@ static int __cpuinit twd_timer_setup(struct clock_event_device *clk)
 {
 	struct clock_event_device **this_cpu_clk;
 
-	if (!twd_clk)
-		twd_clk = twd_get_clock();
-
-	if (!IS_ERR_OR_NULL(twd_clk))
-		twd_timer_rate = clk_get_rate(twd_clk);
-	else
+	if (IS_ERR_OR_NULL(twd_clk))
 		twd_calibrate_rate();
 
 	__raw_writel(0, twd_base + TWD_TIMER_CONTROL);
@@ -349,6 +348,8 @@ int __init twd_local_timer_register(struct twd_local_timer *tlt)
 	if (!twd_base)
 		return -ENOMEM;
 
+	twd_clk = twd_get_clock(NULL);
+
 	return twd_local_timer_common_register();
 }
 
@@ -383,6 +384,8 @@ void __init twd_local_timer_of_register(void)
 		goto out;
 	}
 
+	twd_clk = twd_get_clock(np);
+
 	err = twd_local_timer_common_register();
 
 out:
-- 
1.7.11.7

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