* [PATCH] ARM: dts: make arch-timer always on in rk3288 soc
@ 2014-08-27 1:47 Kever Yang
2014-08-27 9:37 ` Mark Rutland
0 siblings, 1 reply; 2+ messages in thread
From: Kever Yang @ 2014-08-27 1:47 UTC (permalink / raw)
To: heiko
Cc: dianders, sonnyrao, addy.ke, cf, xjq, wulf, lyz, hj, huangtao,
Kever Yang, Rob Herring, Pawel Moll, Mark Rutland, Ian Campbell,
Kumar Gala, Russell King, devicetree, linux-arm-kernel,
linux-kernel
We need use the hrtimer, which need the arch-timer to be 'always-on'
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
---
arch/arm/boot/dts/rk3288.dtsi | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index 5950b0a..698e6ea 100644
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -76,6 +76,7 @@
<GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,
<GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
clock-frequency = <24000000>;
+ always-on;
};
i2c1: i2c@ff140000 {
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ARM: dts: make arch-timer always on in rk3288 soc
2014-08-27 1:47 [PATCH] ARM: dts: make arch-timer always on in rk3288 soc Kever Yang
@ 2014-08-27 9:37 ` Mark Rutland
0 siblings, 0 replies; 2+ messages in thread
From: Mark Rutland @ 2014-08-27 9:37 UTC (permalink / raw)
To: Kever Yang
Cc: heiko@sntech.de, dianders@chromium.org, sonnyrao@chromium.org,
addy.ke@rock-chips.com, cf@rock-chips.com, xjq@rock-chips.com,
wulf@rock-chips.com, lyz@rock-chips.com, hj@rock-chips.com,
huangtao@rock-chips.com, Kever Yang, Rob Herring, Pawel Moll,
Ian Campbell, Kumar Gala, Russell King,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Hi,
On Wed, Aug 27, 2014 at 02:47:40AM +0100, Kever Yang wrote:
> We need use the hrtimer, which need the arch-timer to be 'always-on'
Just to check: it isn't possible to place CPUs in the rk3288 SoC into
low power states where their timers lose state and/or might not fire?
Mark.
> Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
> ---
>
> arch/arm/boot/dts/rk3288.dtsi | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> index 5950b0a..698e6ea 100644
> --- a/arch/arm/boot/dts/rk3288.dtsi
> +++ b/arch/arm/boot/dts/rk3288.dtsi
> @@ -76,6 +76,7 @@
> <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,
> <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
> clock-frequency = <24000000>;
> + always-on;
> };
>
> i2c1: i2c@ff140000 {
> --
> 1.9.1
>
> --
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