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