[RFC PATCH 2/3] documentation: dt: mct: add desc of optional property use-cp15-phys-counter
From: Alexey Klimov <hidden>
Date: 2015-07-27 21:28:44
Also in:
linux-samsung-soc
Subsystem:
clocksource, clockevent drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Daniel Lezcano, Thomas Gleixner, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Signed-off-by: Alexey Klimov <redacted> --- .../devicetree/bindings/timer/samsung,exynos4210-mct.txt | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
index 167d5da..c7f6354 100644
--- a/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
+++ b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt@@ -36,6 +36,16 @@ Required properties: interrupt might be specified, meaning that all local timers use the same per processor interrupt. +Optional properties: + +- use-cp15-phys-counter : set to advise mct clocksource driver to use ARM + arch timer 64-bit counter as main counter. Access to this coprocessor + counter is faster than access to same counter in mct mmio region. + It was discovered that mct and ARM arch timer are same underlying hardware + on some SoCs. + Only supported for Exynos5-based 32-bit systems which follow the ARMv7 + architecture. + Example 1: In this example, the IP contains two local timers, using separate interrupts, so two local timer interrupts have been specified, in addition to four global timer interrupts.
--
2.1.4