regmap.yaml

ip: timer
contract: { aw: 8, dw: 32 }
base: 0x10002000
size: 0x100
params: [channels]
regs:
  - name: ctrl
    offset: 0x00
    desc: global control
    fields:
      - { name: en,   bits: "0:0", sw: rw, hw: r, reset: 0 }
      - { name: rst,  bits: "1:1", sw: rw, hw: r, reset: 0 }
  - name: presc
    offset: 0x04
    desc: prescaler
    fields: [ { name: val, width: 16, sw: rw, hw: r, reset: 0 } ]
  - name: cnt
    offset: 0x08
    desc: free running counter
    fields: [ { name: val, width: 32, sw: r, hw: rw, volatile: true } ]
  - name: cmp
    offset: 0x10
    desc: compare value, one per channel
    array: { count: channels, stride: 4 }
    fields: [ { name: val, width: 32, sw: rw, hw: r, swmod: true, reset: 0 } ]
  - name: capt
    offset: 0x30
    desc: counter latched on the channel input edge
    feature: capture
    array: { count: channels, stride: 4 }
    fields: [ { name: val, width: 32, sw: r, hw: w, hweach: true, reset: 0 } ]
  # capt 是数组，channels 最大 8，占到 0x30..0x4C——中断这两个原来摆在 0x40，
  # 五路以上就压在 capt[4] 上：软件读 capt[4] 读到中断状态，写 ista 清中断
  # 顺手改掉 capt[5]。数组后面的东西要按参数上限让开。
  - name: ista
    offset: 0x50
    desc: match status, write one to clear
    fields:
      - { name: val, width: 8, sw: rw, onwrite: woclr, hw: r, hwset: true, stickybit: true, reset: 0 }
  - name: ien
    offset: 0x54
    desc: match interrupt enable
    fields: [ { name: val, width: 8, sw: rw, hw: r, reset: 0 } ]