From 194444c52edd857210b3895e83ce45c64b58e251 Mon Sep 17 00:00:00 2001 From: Marc Gonzalez Date: Fri, 9 Oct 2015 10:20:47 +0100 Subject: ARM: 8441/2: twd: Don't set CLOCK_EVT_FEAT_C3STOP unconditionally In 5388a6b266 ("ARM: SMP: Always enable clock event broadcast support") Russell noted that "the TWD local timers are unable to wake up the CPU when it is placed into a low power mode". However, some platforms do not stop the TWD block in low-power mode, and can thus use the TWD timer in one-shot mode, without setting up a broadcast device. Make the driver check for the "always-on" boolean property, and set the CLOCK_EVT_FEAT_C3STOP flag accordingly. Acked-by: Mark Rutland Signed-off-by: Marc Gonzalez Signed-off-by: Russell King --- Documentation/devicetree/bindings/arm/twd.txt | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'Documentation/devicetree') diff --git a/Documentation/devicetree/bindings/arm/twd.txt b/Documentation/devicetree/bindings/arm/twd.txt index 75b8610939fa..383ea19c2bf0 100644 --- a/Documentation/devicetree/bindings/arm/twd.txt +++ b/Documentation/devicetree/bindings/arm/twd.txt @@ -19,6 +19,11 @@ interrupts. - reg : Specify the base address and the size of the TWD timer register window. +Optional + +- always-on : a boolean property. If present, the timer is powered through + an always-on power domain, therefore it never loses context. + Example: twd-timer@2c000600 { -- cgit v1.2.3