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* ARM architected timer
*ARM架构定时器
ARM cores may have a per-core architected timer, which provides per-cpu timers,
or a memory mapped architected timer, which provides up to 8 frames with a
physical and optional virtual timer per frame.
每个ARM内核可能会有相应的被提供了CPU定时器，或映射了架构定时器的内存的架构定时器，，
每帧可提供高达8帧的物理和可选的虚拟计时器。
The per-core architected timer is attached to a GIC to deliver its
per-processor interrupts via PPIs. The memory mapped timer is attached to a GIC
to deliver its interrupts via SPIs.
每个核心架构定时器通过PPIs提供的每个处理器的中断连接到GIC，内存映射定时器通过SPI接口提供的中断连接到GIC。
** CP15 Timer node properties:
- compatible : Should at least contain one of
"arm,armv7-timer"
"arm,armv8-timer"
** CP15定时器的节点属性：
- 兼容性：至少应该包含一个“arm,armv7-timer”或者“arm,armv8-timer”
- 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.
- 中断：中断列表秩序为：安全，不安全，虚拟和管理程序各种定时器。
- 时钟频率：主计数器以Hz为单位的频率。可选。
Example:
timer {
compatible = "arm,cortex-a15-timer",
"arm,armv7-timer";
interrupts = <1 13 0xf08>,
<1 14 0xf08>,
<1 11 0xf08>,
<1 10 0xf08>;
clock-frequency = <100000000>;
};
** Memory mapped timer node properties:
- compatible : Should at least contain "arm,armv7-timer-mem".
- clock-frequency : The frequency of the main counter, in Hz. Optional.
- reg : The control frame base address.
**内存映射定时器的节点属性：
- 兼容性：至少应该包含“arm,armv7-timer-mem”。
- 时钟频率：主计数器以Hz为单位的频率。可选。
- 寄存器：控制帧的基址。
Note that #address-cells, #size-cells, and ranges shall be present to ensure
the CPU can address a frame's registers.
需要注意的是单元的地址,单元的大小和范围应确保CPU可以处理一帧的寄存器。
A timer node has up to 8 frame sub-nodes, each with the following properties:
- frame-number: 0 to 7.
- interrupts : Interrupt list for physical and virtual timers in that order.
The virtual timer interrupt is optional.
- reg : The first and second view base addresses in that order. The second view
base address is optional.
- status : "disabled" indicates the frame is not available for use. Optional.
一个定时器节点有8帧的子节点，每个子节点具有以下属性：
- 帧数目：0~7。
- 中断：中断列表的顺序为物理和虚拟定时器。虚拟定时器中断是可选的。
- 寄存器：顺序为第一和第二观点的基地址。第二种观点基地址是可选的。
- 状态：“禁用”表示帧不可以使用。可选。
Example:
timer@f0000000 {
compatible = "arm,armv7-timer-mem";
#address-cells = <1>;
#size-cells = <1>;
ranges;
reg = <0xf0000000 0x1000>;
clock-frequency = <50000000>;
frame@f0001000 {
frame-number = <0>
interrupts = <0 13 0x8>,
<0 14 0x8>;
reg = <0xf0001000 0x1000>,
<0xf0002000 0x1000>;
};
frame@f0003000 {
frame-number = <1>
interrupts = <0 15 0x8>;
reg = <0xf0003000 0x1000>;
status = "disabled";
};
};
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