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| author | Marc Gonzalez <marc_gonzalez@sigmadesigns.com> | 2015-10-09 10:20:47 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-10-09 16:22:53 +0100 |
| commit | 194444c52edd857210b3895e83ce45c64b58e251 (patch) | |
| tree | 65e0cc031ef48d29ab39561728c75df51ef1959f /Documentation | |
| parent | ff5138f3af4ed61ed42e00d7d771a0502460488f (diff) | |
| download | linux-194444c52edd857210b3895e83ce45c64b58e251.tar.bz2 | |
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 <mark.rutland@arm.com>
Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/arm/twd.txt | 5 |
1 files changed, 5 insertions, 0 deletions
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 { |