summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/arm/arch_timer.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/arm/arch_timer.txt')
-rw-r--r--Documentation/devicetree/bindings/arm/arch_timer.txt8
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/arm/arch_timer.txt b/Documentation/devicetree/bindings/arm/arch_timer.txt
index 256b4d8..e774128 100644
--- a/Documentation/devicetree/bindings/arm/arch_timer.txt
+++ b/Documentation/devicetree/bindings/arm/arch_timer.txt
@@ -17,7 +17,10 @@ to deliver its interrupts via SPIs.
- interrupts : Interrupt list for secure, non-secure, virtual and
hypervisor timers, in that order.
-- clock-frequency : The frequency of the main counter, in Hz. Optional.
+- clock-frequency : The frequency of the main counter, in Hz. Should be present
+ only where necessary to work around broken firmware which does not configure
+ CNTFRQ on all CPUs to a uniform correct value. Use of this property is
+ strongly discouraged; fix your firmware unless absolutely impossible.
- always-on : a boolean property. If present, the timer is powered through an
always-on power domain, therefore it never loses context.
@@ -46,7 +49,8 @@ Example:
- compatible : Should at least contain "arm,armv7-timer-mem".
-- clock-frequency : The frequency of the main counter, in Hz. Optional.
+- clock-frequency : The frequency of the main counter, in Hz. Should be present
+ only when firmware has not configured the MMIO CNTFRQ registers.
- reg : The control frame base address.
OpenPOWER on IntegriCloud