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Diffstat (limited to 'kernel/Documentation/devicetree/bindings/timer/renesas,cmt.txt')
| -rw-r--r-- | kernel/Documentation/devicetree/bindings/timer/renesas,cmt.txt | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/timer/renesas,cmt.txt b/kernel/Documentation/devicetree/bindings/timer/renesas,cmt.txt new file mode 100644 index 000000000..1a05c1b24 --- /dev/null +++ b/kernel/Documentation/devicetree/bindings/timer/renesas,cmt.txt @@ -0,0 +1,79 @@ +* Renesas R-Car Compare Match Timer (CMT) + +The CMT is a multi-channel 16/32/48-bit timer/counter with configurable clock +inputs and programmable compare match. + +Channels share hardware resources but their counter and compare match value +are independent. A particular CMT instance can implement only a subset of the +channels supported by the CMT model. Channel indices represent the hardware +position of the channel in the CMT and don't match the channel numbers in the +datasheets. + +Required Properties: + + - compatible: must contain one or more of the following: + - "renesas,cmt-32-r8a7740" for the r8a7740 32-bit CMT + (CMT0) + - "renesas,cmt-32-sh7372" for the sh7372 32-bit CMT + (CMT0) + - "renesas,cmt-32-sh73a0" for the sh73a0 32-bit CMT + (CMT0) + - "renesas,cmt-32" for all 32-bit CMT without fast clock support + (CMT0 on sh7372, sh73a0 and r8a7740) + This is a fallback for the above renesas,cmt-32-* entries. + + - "renesas,cmt-32-fast-r8a7740" for the r8a7740 32-bit CMT with fast + clock support (CMT[234]) + - "renesas,cmt-32-fast-sh7372" for the sh7372 32-bit CMT with fast + clock support (CMT[234]) + - "renesas,cmt-32-fast-sh73a0" for the sh73A0 32-bit CMT with fast + clock support (CMT[234]) + - "renesas,cmt-32-fast" for all 32-bit CMT with fast clock support + (CMT[234] on sh7372, sh73a0 and r8a7740) + This is a fallback for the above renesas,cmt-32-fast-* entries. + + - "renesas,cmt-48-sh7372" for the sh7372 48-bit CMT + (CMT1) + - "renesas,cmt-48-sh73a0" for the sh73A0 48-bit CMT + (CMT1) + - "renesas,cmt-48-r8a7740" for the r8a7740 48-bit CMT + (CMT1) + - "renesas,cmt-48" for all non-second generation 48-bit CMT + (CMT1 on sh7372, sh73a0 and r8a7740) + This is a fallback for the above renesas,cmt-48-* entries. + + - "renesas,cmt-48-r8a73a4" for the r8a73a4 48-bit CMT + (CMT[01]) + - "renesas,cmt-48-r8a7790" for the r8a7790 48-bit CMT + (CMT[01]) + - "renesas,cmt-48-r8a7791" for the r8a7791 48-bit CMT + (CMT[01]) + - "renesas,cmt-48-gen2" for all second generation 48-bit CMT + (CMT[01] on r8a73a4, r8a7790 and r8a7791) + This is a fallback for the renesas,cmt-48-r8a73a4, + renesas,cmt-48-r8a7790 and renesas,cmt-48-r8a7791 entries. + + - reg: base address and length of the registers block for the timer module. + - interrupts: interrupt-specifier for the timer, one per channel. + - clocks: a list of phandle + clock-specifier pairs, one for each entry + in clock-names. + - clock-names: must contain "fck" for the functional clock. + + - renesas,channels-mask: bitmask of the available channels. + + +Example: R8A7790 (R-Car H2) CMT0 node + + CMT0 on R8A7790 implements hardware channels 5 and 6 only and names + them channels 0 and 1 in the documentation. + + cmt0: timer@ffca0000 { + compatible = "renesas,cmt-48-r8a7790", "renesas,cmt-48-gen2"; + reg = <0 0xffca0000 0 0x1004>; + interrupts = <0 142 IRQ_TYPE_LEVEL_HIGH>, + <0 142 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&mstp1_clks R8A7790_CLK_CMT0>; + clock-names = "fck"; + + renesas,channels-mask = <0x60>; + }; |