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     1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/timer/arm,armv7m-systick.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: ARMv7M System Timer
    8 
    9 maintainers:
   10   - Alexandre Torgue <alexandre.torgue@foss.st.com>
   11   - Fabrice Gasnier <fabrice.gasnier@foss.st.com>
   12 
   13 description: ARMv7-M includes a system timer, known as SysTick.
   14 
   15 properties:
   16   compatible:
   17     const: arm,armv7m-systick
   18 
   19   reg:
   20     maxItems: 1
   21 
   22   clocks:
   23     maxItems: 1
   24 
   25   clock-frequency: true
   26 
   27 oneOf:
   28   - required:
   29       - clocks
   30   - required:
   31       - clock-frequency
   32 
   33 required:
   34   - compatible
   35   - reg
   36 
   37 additionalProperties: false
   38 
   39 examples:
   40   - |
   41     timer@e000e010 {
   42         compatible = "arm,armv7m-systick";
   43         reg = <0xe000e010 0x10>;
   44         clocks = <&clk_systick>;
   45     };
   46 
   47   - |
   48     timer@e000e010 {
   49         compatible = "arm,armv7m-systick";
   50         reg = <0xe000e010 0x10>;
   51         clock-frequency = <90000000>;
   52     };
   53 
   54 ...
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