Bindings/rtc/amlogic,meson-vrtc.yaml

   1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/rtc/amlogic,meson-vrtc.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Amlogic Virtual RTC (VRTC)
   8
   9 maintainers:
  10   - Neil Armstrong <neil.armstrong@linaro.org>
  11
  12 description: |
  13   This is a Linux interface to an RTC managed by firmware, hence it's
  14   virtual from a Linux perspective.  The interface is 1 register where
  15   an alarm time (in seconds) is to be written.
  16   The alarm register is a simple scratch register shared between the
  17   application processors (AP) and the secure co-processor (SCP.)  When
  18   the AP suspends, the SCP will use the value of this register to
  19   program an always-on timer before going sleep. When the timer expires,
  20   the SCP will wake up and will then wake the AP.
  21
  22 allOf:
  23   - $ref: rtc.yaml#
  24
  25 properties:
  26   compatible:
  27     enum:
  28       - amlogic,meson-vrtc
  29
  30   reg:
  31     maxItems: 1
  32
  33 required:
  34   - compatible
  35   - reg
  36
  37 additionalProperties: false
  38
  39 examples:
  40   - |
  41     rtc@a8 {
  42       compatible = "amlogic,meson-vrtc";
  43       reg = <0x000a8 0x4>;
  44     };