# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/timer/samsung,exynos4210-mct.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Samsung Exynos SoC Multi Core Timer (MCT)
maintainers:
- Krzysztof Kozlowski <krzk@kernel.org>
description: |+
The Samsung's Multi Core Timer (MCT) module includes two main blocks, the
global timer and CPU local timers. The global timer is a 64-bit free running
up-counter and can generate 4 interrupts when the counter reaches one of the
four preset counter values. The CPU local timers are 32-bit free running
down-counters and generate an interrupt when the counter expires. There is
one CPU local timer instantiated in MCT for every CPU in the system.
properties:
compatible:
oneOf:
- enum:
- samsung,exynos4210-mct
- samsung,exynos4412-mct
- items:
- enum:
- axis,artpec8-mct
- samsung,exynos3250-mct
- samsung,exynos5250-mct
- samsung,exynos5260-mct
- samsung,exynos5420-mct
- samsung,exynos5433-mct
- samsung,exynos850-mct
- tesla,fsd-mct
- const: samsung,exynos4210-mct
clocks:
maxItems: 2
clock-names:
items:
- const: fin_pll
- const: mct
reg:
maxItems: 1
samsung,frc-shared:
type: boolean
description: |
Indicates that the hardware requires that this processor share the
free-running counter with a different (main) processor.
samsung,local-timers:
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 1
maxItems: 16
description: |
List of indices of local timers usable from this processor.
interrupts:
description: |
Interrupts should be put in specific order. This is, the local timer
interrupts should be specified after the four global timer interrupts
have been specified:
0: Global Timer Interrupt 0
1: Global Timer Interrupt 1
2: Global Timer Interrupt 2
3: Global Timer Interrupt 3
4: Local Timer Interrupt 0
5: Local Timer Interrupt 1
6: ..
7: ..
i: Local Timer Interrupt n
For MCT block that uses a per-processor interrupt for local timers, such
as ones compatible with "samsung,exynos4412-mct", only one local timer
interrupt might be specified, meaning that all local timers use the same
per processor interrupt.
minItems: 5 # 4 Global + 1 local
maxItems: 20 # 4 Global + 16 local
required:
- compatible
- clock-names
- clocks
- interrupts
- reg
allOf:
- if:
not:
properties:
compatible:
contains:
enum:
- axis,artpec8-mct
then:
properties:
samsung,local-timers: false
samsung,frc-shared: false
- if:
properties:
compatible:
contains:
const: samsung,exynos3250-mct
then:
properties:
interrupts:
minItems: 8
maxItems: 8
- if:
properties:
compatible:
contains:
const: samsung,exynos5250-mct
then:
properties:
interrupts:
minItems: 6
maxItems: 6
- if:
properties:
compatible:
contains:
enum:
- axis,artpec8-mct
- samsung,exynos5260-mct
- samsung,exynos5420-mct
- samsung,exynos5433-mct
- samsung,exynos850-mct
then:
properties:
interrupts:
minItems: 12
maxItems: 12
- if:
properties:
compatible:
contains:
enum:
- tesla,fsd-mct
then:
properties:
interrupts:
minItems: 16
maxItems: 16
additionalProperties: false
examples:
- |
// In this example, the IP contains two local timers, using separate
// interrupts, so two local timer interrupts have been specified,
// in addition to four global timer interrupts.
#include <dt-bindings/clock/exynos4.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
timer@10050000 {
compatible = "samsung,exynos4210-mct";
reg = <0x10050000 0x800>;
clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MCT>;
clock-names = "fin_pll", "mct";
interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 71 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
};
- |
// In this example, the timer interrupts are connected to two separate
// interrupt controllers. Hence, an interrupts-extended is needed.
#include <dt-bindings/clock/exynos4.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
timer@101c0000 {
compatible = "samsung,exynos4210-mct";
reg = <0x101C0000 0x800>;
clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MCT>;
clock-names = "fin_pll", "mct";
interrupts-extended = <&gic GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
<&gic GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
<&combiner 12 6>,
<&combiner 12 7>,
<&gic GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>,
<&gic GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
};
- |
// In this example, the IP contains four local timers, but using
// a per-processor interrupt to handle them. Only one first local
// interrupt is specified.
#include <dt-bindings/clock/exynos4.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
timer@10050000 {
compatible = "samsung,exynos4412-mct";
reg = <0x10050000 0x800>;
clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MCT>;
clock-names = "fin_pll", "mct";
interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 71 IRQ_TYPE_LEVEL_HIGH>,
<GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>;
};
- |
// In this example, the IP contains four local timers, but using
// a per-processor interrupt to handle them. All the local timer
// interrupts are specified.
#include <dt-bindings/clock/exynos4.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
timer@10050000 {
compatible = "samsung,exynos4412-mct";
reg = <0x10050000 0x800>;
clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MCT>;
clock-names = "fin_pll", "mct";
interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 71 IRQ_TYPE_LEVEL_HIGH>,
<GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>,
<GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>,
<GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>,
<GIC_PPI 42 IRQ_TYPE_LEVEL_HIGH>;
};