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Diffstat (limited to 'Documentation/devicetree/bindings/timer/arm,arch_timer.txt')
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diff --git a/Documentation/devicetree/bindings/timer/arm,arch_timer.txt b/Documentation/devicetree/bindings/timer/arm,arch_timer.txt deleted file mode 100644 index 68301b77e854..000000000000 --- a/Documentation/devicetree/bindings/timer/arm,arch_timer.txt +++ /dev/null @@ -1,112 +0,0 @@ -* ARM architected timer - -ARM cores may have a per-core architected timer, which provides per-cpu timers, -or a memory mapped architected timer, which provides up to 8 frames with a -physical and optional virtual timer per frame. - -The per-core architected timer is attached to a GIC to deliver its -per-processor interrupts via PPIs. The memory mapped timer is attached to a GIC -to deliver its interrupts via SPIs. - -** CP15 Timer node properties: - -- compatible : Should at least contain one of - "arm,armv7-timer" - "arm,armv8-timer" - -- interrupts : Interrupt list for secure, non-secure, virtual and - hypervisor timers, in that order. - -- clock-frequency : The frequency of the main counter, in Hz. Should be present - only where necessary to work around broken firmware which does not configure - CNTFRQ on all CPUs to a uniform correct value. Use of this property is - strongly discouraged; fix your firmware unless absolutely impossible. - -- always-on : a boolean property. If present, the timer is powered through an - always-on power domain, therefore it never loses context. - -- fsl,erratum-a008585 : A boolean property. Indicates the presence of - QorIQ erratum A-008585, which says that reading the counter is - unreliable unless the same value is returned by back-to-back reads. - This also affects writes to the tval register, due to the implicit - counter read. - -- hisilicon,erratum-161010101 : A boolean property. Indicates the - presence of Hisilicon erratum 161010101, which says that reading the - counters is unreliable in some cases, and reads may return a value 32 - beyond the correct value. This also affects writes to the tval - registers, due to the implicit counter read. - -** Optional properties: - -- arm,cpu-registers-not-fw-configured : Firmware does not initialize - any of the generic timer CPU registers, which contain their - architecturally-defined reset values. Only supported for 32-bit - systems which follow the ARMv7 architected reset values. - -- arm,no-tick-in-suspend : The main counter does not tick when the system is in - low-power system suspend on some SoCs. This behavior does not match the - Architecture Reference Manual's specification that the system counter "must - be implemented in an always-on power domain." - - -Example: - - timer { - compatible = "arm,cortex-a15-timer", - "arm,armv7-timer"; - interrupts = <1 13 0xf08>, - <1 14 0xf08>, - <1 11 0xf08>, - <1 10 0xf08>; - clock-frequency = <100000000>; - }; - -** Memory mapped timer node properties: - -- compatible : Should at least contain "arm,armv7-timer-mem". - -- clock-frequency : The frequency of the main counter, in Hz. Should be present - only when firmware has not configured the MMIO CNTFRQ registers. - -- reg : The control frame base address. - -Note that #address-cells, #size-cells, and ranges shall be present to ensure -the CPU can address a frame's registers. - -A timer node has up to 8 frame sub-nodes, each with the following properties: - -- frame-number: 0 to 7. - -- interrupts : Interrupt list for physical and virtual timers in that order. - The virtual timer interrupt is optional. - -- reg : The first and second view base addresses in that order. The second view - base address is optional. - -- status : "disabled" indicates the frame is not available for use. Optional. - -Example: - - timer@f0000000 { - compatible = "arm,armv7-timer-mem"; - #address-cells = <1>; - #size-cells = <1>; - ranges; - reg = <0xf0000000 0x1000>; - clock-frequency = <50000000>; - - frame@f0001000 { - frame-number = <0> - interrupts = <0 13 0x8>, - <0 14 0x8>; - reg = <0xf0001000 0x1000>, - <0xf0002000 0x1000>; - }; - - frame@f0003000 { - frame-number = <1> - interrupts = <0 15 0x8>; - reg = <0xf0003000 0x1000>; - }; - }; |