[PATCH 1/4 v10] arm: use devicetree to get smp_twd clock

Mark Langsdorf
2013-01-04T16:36:19Z

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

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
---
Changes from v9
Updated to work with 3.8 kernel.
Changes from v4, v5, v6, v7, v8
None.
Changes from v3
No longer setting *clk to NULL in twd_get_clock().
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 | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index 49f335d..dad2d81 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -239,12 +239,15 @@ 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;
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;
@@ -257,6 +260,7 @@ static struct clk *twd_get_clock(void)
return ERR_PTR(err);
}

+ twd_timer_rate = clk_get_rate(clk);
return clk;
}

@@ -285,7 +289,7 @@ static int __cpuinit twd_timer_setup(struct clock_event_device *clk)
* during the runtime of the system.
*/
if (!common_setup_called) {
- twd_clk = twd_get_clock();
+ twd_clk = twd_get_clock(NULL);

/*
* We use IS_ERR_OR_NULL() here, because if the clock stubs
@@ -373,6 +377,8 @@ 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();
}

@@ -405,6 +411,8 @@ void __init twd_local_timer_of_register(void)
goto out;
}

+ twd_clk = twd_get_clock(np);
+
err = twd_local_timer_common_register();

out:
--
1.8.0.2