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The system counter (sys_ctr) is a programmable system counter which provides a shared time base to the Cortex A15, A7, A53 etc cores. It is intended for use in applications where the counter is always powered on and supports multiple, unrelated clocks. The sys_ctr hardware supports: - 56-bit counter width (roll-over time greater than 40 years) - compare frame(64-bit compare value) contains programmable interrupt generation when compare value <= counter value. [dlezcano] Fixed over 80 chars length warning Signed-off-by: Bai Ping <ping.bai@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
26 lines
969 B
Plaintext
26 lines
969 B
Plaintext
NXP System Counter Module(sys_ctr)
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The system counter(sys_ctr) is a programmable system counter which provides
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a shared time base to Cortex A15, A7, A53, A73, etc. it is intended for use in
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applications where the counter is always powered and support multiple,
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unrelated clocks. The compare frame inside can be used for timer purpose.
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Required properties:
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- compatible : should be "nxp,sysctr-timer"
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- reg : Specifies the base physical address and size of the comapre
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frame and the counter control, read & compare.
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- interrupts : should be the first compare frames' interrupt
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- clocks : Specifies the counter clock.
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- clock-names: Specifies the clock's name of this module
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Example:
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system_counter: timer@306a0000 {
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compatible = "nxp,sysctr-timer";
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reg = <0x306a0000 0x20000>;/* system-counter-rd & compare */
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clocks = <&clk_8m>;
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clock-names = "per";
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interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
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};
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