[PATCH 02/11] ARM: remove extra timer-sp control register clearing
Linus Walleij
linus.walleij at linaro.org
Thu Mar 21 13:58:08 EDT 2013
On Wed, Mar 20, 2013 at 11:54 PM, Rob Herring <robherring2 at gmail.com> wrote:
> From: Rob Herring <rob.herring at calxeda.com>
>
> The timer-sp initialization code clears the control register before
> initializing the timers, so every platform doing this is redundant.
>
> For unused timers, we should not care what state they are in.
>
> Signed-off-by: Rob Herring <rob.herring at calxeda.com>
(...)
> diff --git a/arch/arm/mach-integrator/integrator_ap.c b/arch/arm/mach-integrator/integrator_ap.c
> index ea96144..4cb322d 100644
> --- a/arch/arm/mach-integrator/integrator_ap.c
> +++ b/arch/arm/mach-integrator/integrator_ap.c
> @@ -643,10 +643,6 @@ static void __init ap_timer_init(void)
> clk_prepare_enable(clk);
> rate = clk_get_rate(clk);
>
> - writel(0, TIMER0_VA_BASE + TIMER_CTRL);
> - writel(0, TIMER1_VA_BASE + TIMER_CTRL);
> - writel(0, TIMER2_VA_BASE + TIMER_CTRL);
> -
As noted this is not an init function for timer-sp.c so please drop this
hunk of the patch. Maybe this zeroing is pointless but that would
be a separate patch that I can test.
> diff --git a/arch/arm/mach-integrator/integrator_cp.c b/arch/arm/mach-integrator/integrator_cp.c
> index 2b0db82..c68e7d8 100644
> --- a/arch/arm/mach-integrator/integrator_cp.c
> +++ b/arch/arm/mach-integrator/integrator_cp.c
> @@ -33,7 +33,6 @@
> #include <mach/platform.h>
> #include <asm/setup.h>
> #include <asm/mach-types.h>
> -#include <asm/hardware/arm_timer.h>
What doe this change has to do with $SUBJECT?
> #include <asm/hardware/icst.h>
>
> #include <mach/cm.h>
> @@ -267,7 +266,6 @@ static void __init cp_of_timer_init(void)
> base = of_iomap(node, 0);
> if (WARN_ON(!base))
> return;
> - writel(0, base + TIMER_CTRL);
> sp804_clocksource_init(base, node->name);
>
> err = of_property_read_string(of_aliases,
> @@ -279,7 +277,6 @@ static void __init cp_of_timer_init(void)
> if (WARN_ON(!base))
> return;
> irq = irq_of_parse_and_map(node, 0);
> - writel(0, base + TIMER_CTRL);
> sp804_clockevents_init(base, irq, node->name);
> }
>
> @@ -510,10 +507,6 @@ static void __init intcp_init_irq(void)
>
> static void __init cp_timer_init(void)
> {
> - writel(0, TIMER0_VA_BASE + TIMER_CTRL);
> - writel(0, TIMER1_VA_BASE + TIMER_CTRL);
> - writel(0, TIMER2_VA_BASE + TIMER_CTRL);
> -
> sp804_clocksource_init(TIMER2_VA_BASE, "timer2");
> sp804_clockevents_init(TIMER1_VA_BASE, IRQ_TIMERINT1, "timer1");
> }
The rest of the changes to integrator_cp.c looks OK...
Yours,
Linus Walleij
More information about the linux-arm-kernel
mailing list