1 * Renesas R-Car Compare Match Timer (CMT)
3 The CMT is a multi-channel 16/32/48-bit timer/counter with configurable clock
4 inputs and programmable compare match.
6 Channels share hardware resources but their counter and compare match value
7 are independent. A particular CMT instance can implement only a subset of the
8 channels supported by the CMT model. Channel indices represent the hardware
9 position of the channel in the CMT and don't match the channel numbers in the
14 - compatible: must contain one or more of the following:
15 - "renesas,cmt-32-r8a7740" for the r8a7740 32-bit CMT
17 - "renesas,cmt-32-sh7372" for the sh7372 32-bit CMT
19 - "renesas,cmt-32-sh73a0" for the sh73a0 32-bit CMT
21 - "renesas,cmt-32" for all 32-bit CMT without fast clock support
22 (CMT0 on sh7372, sh73a0 and r8a7740)
23 This is a fallback for the above renesas,cmt-32-* entries.
25 - "renesas,cmt-32-fast-r8a7740" for the r8a7740 32-bit CMT with fast
26 clock support (CMT[234])
27 - "renesas,cmt-32-fast-sh7372" for the sh7372 32-bit CMT with fast
28 clock support (CMT[234])
29 - "renesas,cmt-32-fast-sh73a0" for the sh73A0 32-bit CMT with fast
30 clock support (CMT[234])
31 - "renesas,cmt-32-fast" for all 32-bit CMT with fast clock support
32 (CMT[234] on sh7372, sh73a0 and r8a7740)
33 This is a fallback for the above renesas,cmt-32-fast-* entries.
35 - "renesas,cmt-48-sh7372" for the sh7372 48-bit CMT
37 - "renesas,cmt-48-sh73a0" for the sh73A0 48-bit CMT
39 - "renesas,cmt-48-r8a7740" for the r8a7740 48-bit CMT
41 - "renesas,cmt-48" for all non-second generation 48-bit CMT
42 (CMT1 on sh7372, sh73a0 and r8a7740)
43 This is a fallback for the above renesas,cmt-48-* entries.
45 - "renesas,cmt-48-r8a73a4" for the r8a73a4 48-bit CMT
47 - "renesas,cmt-48-r8a7790" for the r8a7790 48-bit CMT
49 - "renesas,cmt-48-r8a7791" for the r8a7791 48-bit CMT
51 - "renesas,cmt-48-gen2" for all second generation 48-bit CMT
52 (CMT[01] on r8a73a4, r8a7790 and r8a7791)
53 This is a fallback for the renesas,cmt-48-r8a73a4,
54 renesas,cmt-48-r8a7790 and renesas,cmt-48-r8a7791 entries.
56 - reg: base address and length of the registers block for the timer module.
57 - interrupts: interrupt-specifier for the timer, one per channel.
58 - clocks: a list of phandle + clock-specifier pairs, one for each entry
60 - clock-names: must contain "fck" for the functional clock.
62 - renesas,channels-mask: bitmask of the available channels.
65 Example: R8A7790 (R-Car H2) CMT0 node
67 CMT0 on R8A7790 implements hardware channels 5 and 6 only and names
68 them channels 0 and 1 in the documentation.
70 cmt0: timer@ffca0000 {
71 compatible = "renesas,cmt-48-r8a7790", "renesas,cmt-48-gen2";
72 reg = <0 0xffca0000 0 0x1004>;
73 interrupts = <0 142 IRQ_TYPE_LEVEL_HIGH>,
74 <0 142 IRQ_TYPE_LEVEL_HIGH>;
75 clocks = <&mstp1_clks R8A7790_CLK_CMT0>;
78 renesas,channels-mask = <0x60>;