From c1b40e447af8695666d4c11cfec4a7407e6a124d Mon Sep 17 00:00:00 2001 From: Stuart Menefy Date: Wed, 26 Jun 2013 12:48:38 +0100 Subject: clocksource: arm_global_timer: Add ARM global timer support This is a simple driver for the global timer module found in the Cortex A9-MP cores from revision r1p0 onwards. This should be able to perform the functions of the system timer and the local timer in an SMP system. The global timer has the following features: The global timer is a 64-bit incrementing counter with an auto-incrementing feature. It continues incrementing after sending interrupts. The global timer is memory mapped in the private memory region. The global timer is accessible to all Cortex-A9 processors in the cluster. Each Cortex-A9 processor has a private 64-bit comparator that is used to assert a private interrupt when the global timer has reached the comparator value. All the Cortex-A9 processors in a design use the banked ID, ID27, for this interrupt. ID27 is sent to the Interrupt Controller as a Private Peripheral Interrupt. The global timer is clocked by PERIPHCLK. Signed-off-by: Stuart Menefy Signed-off-by: Srinivas Kandagatla CC: Arnd Bergmann CC: Rob Herring CC: Linus Walleij CC: Will Deacon CC: Thomas Gleixner Signed-off-by: Daniel Lezcano --- .../devicetree/bindings/arm/global_timer.txt | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/global_timer.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/arm/global_timer.txt b/Documentation/devicetree/bindings/arm/global_timer.txt new file mode 100644 index 0000000..1e54898 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/global_timer.txt @@ -0,0 +1,24 @@ + +* ARM Global Timer + Cortex-A9 are often associated with a per-core Global timer. + +** Timer node required properties: + +- compatible : Should be "arm,cortex-a9-global-timer" + Driver supports versions r2p0 and above. + +- interrupts : One interrupt to each core + +- reg : Specify the base address and the size of the GT timer + register window. + +- clocks : Should be phandle to a clock. + +Example: + + timer@2c000600 { + compatible = "arm,cortex-a9-global-timer"; + reg = <0x2c000600 0x20>; + interrupts = <1 13 0xf01>; + clocks = <&arm_periph_clk>; + }; -- cgit v1.1