Documentation/devicetree/bindings/timer/renesas,cmt.txt

   1 * Renesas R-Car Compare Match Timer (CMT)
   2
   3 The CMT is a multi-channel 16/32/48-bit timer/counter with configurable clock
   4 inputs and programmable compare match.
   5
   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
  10 datasheets.
  11
  12 Required Properties:
  13
  14   - compatible: must contain one or more of the following:
  15     - "renesas,cmt-48-sh73a0" for the sh73A0 48-bit CMT
  16                 (CMT1)
  17     - "renesas,cmt-48-r8a7740" for the r8a7740 48-bit CMT
  18                 (CMT1)
  19     - "renesas,cmt-48" for all non-second generation 48-bit CMT
  20                 (CMT1 on sh73a0 and r8a7740)
  21                 This is a fallback for the above renesas,cmt-48-* entries.
  22
  23     - "renesas,r8a73a4-cmt0" for the 32-bit CMT0 device included in r8a73a4.
  24     - "renesas,r8a73a4-cmt1" for the 48-bit CMT1 device included in r8a73a4.
  25     - "renesas,r8a7790-cmt0" for the 32-bit CMT0 device included in r8a7790.
  26     - "renesas,r8a7790-cmt1" for the 48-bit CMT1 device included in r8a7790.
  27     - "renesas,r8a7791-cmt0" for the 32-bit CMT0 device included in r8a7791.
  28     - "renesas,r8a7791-cmt1" for the 48-bit CMT1 device included in r8a7791.
  29     - "renesas,r8a7793-cmt0" for the 32-bit CMT0 device included in r8a7793.
  30     - "renesas,r8a7793-cmt1" for the 48-bit CMT1 device included in r8a7793.
  31     - "renesas,r8a7794-cmt0" for the 32-bit CMT0 device included in r8a7794.
  32     - "renesas,r8a7794-cmt1" for the 48-bit CMT1 device included in r8a7794.
  33
  34     - "renesas,rcar-gen2-cmt0" for 32-bit CMT0 devices included in R-Car Gen2.
  35     - "renesas,rcar-gen2-cmt1" for 48-bit CMT1 devices included in R-Car Gen2.
  36                 These are fallbacks for r8a73a4 and all the R-Car Gen2
  37                 entries listed above.
  38
  39   - reg: base address and length of the registers block for the timer module.
  40   - interrupts: interrupt-specifier for the timer, one per channel.
  41   - clocks: a list of phandle + clock-specifier pairs, one for each entry
  42     in clock-names.
  43   - clock-names: must contain "fck" for the functional clock.
  44
  45
  46 Example: R8A7790 (R-Car H2) CMT0 and CMT1 nodes
  47
  48         cmt0: timer@ffca0000 {
  49                 compatible = "renesas,r8a7790-cmt0", "renesas,rcar-gen2-cmt0";
  50                 reg = <0 0xffca0000 0 0x1004>;
  51                 interrupts = <0 142 IRQ_TYPE_LEVEL_HIGH>,
  52                              <0 142 IRQ_TYPE_LEVEL_HIGH>;
  53                 clocks = <&mstp1_clks R8A7790_CLK_CMT0>;
  54                 clock-names = "fck";
  55         };
  56
  57         cmt1: timer@e6130000 {
  58                 compatible = "renesas,r8a7790-cmt1", "renesas,rcar-gen2-cmt1";
  59                 reg = <0 0xe6130000 0 0x1004>;
  60                 interrupts = <0 120 IRQ_TYPE_LEVEL_HIGH>,
  61                              <0 121 IRQ_TYPE_LEVEL_HIGH>,
  62                              <0 122 IRQ_TYPE_LEVEL_HIGH>,
  63                              <0 123 IRQ_TYPE_LEVEL_HIGH>,
  64                              <0 124 IRQ_TYPE_LEVEL_HIGH>,
  65                              <0 125 IRQ_TYPE_LEVEL_HIGH>,
  66                              <0 126 IRQ_TYPE_LEVEL_HIGH>,
  67                              <0 127 IRQ_TYPE_LEVEL_HIGH>;
  68                 clocks = <&mstp3_clks R8A7790_CLK_CMT1>;
  69                 clock-names = "fck";
  70         };