[PATCHv2] arm/tegra: clk_get should not be fatal

[PATCHv2] arm/tegra: clk_get should not be fatal

[pdeschrijver]

From: Peter De Schrijver <pdeschrijver@nvidia.com>

The timer and rtc-timer clocks aren't gated by default, so there is no reason
to crash the system if the dummy enable call failed.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
---
 arch/arm/mach-tegra/timer.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-tegra/timer.c b/arch/arm/mach-tegra/timer.c
index e2272d2..2f1df47 100644
--- a/arch/arm/mach-tegra/timer.c
+++ b/arch/arm/mach-tegra/timer.c
@@ -186,16 +186,20 @@ static void __init tegra_init_timer(void)
 	int ret;
 
 	clk = clk_get_sys("timer", NULL);
-	BUG_ON(IS_ERR(clk));
-	clk_enable(clk);
+	if (IS_ERR(clk))
+		pr_warn("Unable to get timer clock\n");
+	else
+		clk_enable(clk);
 
 	/*
 	 * rtc registers are used by read_persistent_clock, keep the rtc clock
 	 * enabled
 	 */
 	clk = clk_get_sys("rtc-tegra", NULL);
-	BUG_ON(IS_ERR(clk));
-	clk_enable(clk);
+	if (IS_ERR(clk))
+		pr_warn("Unable to get rtc-tegra clock\n");
+	else
+		clk_enable(clk);
 
 #ifdef CONFIG_HAVE_ARM_TWD
 	twd_base = IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x600);
-- 
1.7.7.rc0.72.g4b5ea.dirty

RE: [PATCHv2] arm/tegra: clk_get should not be fatal

[Stephen Warren]

pdeschrijver@nvidia.com wrote at Wednesday, October 26, 2011 2:42 AM:
> The timer and rtc-timer clocks aren't gated by default, so there is no reason
> to crash the system if the dummy enable call failed.
...
>  	clk = clk_get_sys("timer", NULL);
> -	BUG_ON(IS_ERR(clk));
> -	clk_enable(clk);
> +	if (IS_ERR(clk))
> +		pr_warn("Unable to get timer clock\n");
> +	else
> +		clk_enable(clk);

This seems reasonable to me, and is certainly required for Tegra30 support
until we get a full clock tree set up for Tegra30, which I think we'll
probably defer until the common clock infra-structure is in place.

Acked-by: Stephen Warren <swarren@nvidia.com>

-- 
nvpublic