Documentation/devicetree/bindings/arm/amlogic/amlogic,meson-gx-ao-secure.yaml

   1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
   2 # Copyright 2019 BayLibre, SAS
   3 %YAML 1.2
   4 ---
   5 $id: "http://devicetree.org/schemas/arm/amlogic/amlogic,meson-gx-ao-secure.yaml#"
   6 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
   7
   8 title: Amlogic Meson Firmware registers Interface
   9
  10 maintainers:
  11   - Neil Armstrong <neil.armstrong@linaro.org>
  12
  13 description: |
  14   The Meson SoCs have a register bank with status and data shared with the
  15   secure firmware.
  16
  17 # We need a select here so we don't match all nodes with 'syscon'
  18 select:
  19   properties:
  20     compatible:
  21       contains:
  22         const: amlogic,meson-gx-ao-secure
  23   required:
  24     - compatible
  25
  26 properties:
  27   compatible:
  28     items:
  29       - const: amlogic,meson-gx-ao-secure
  30       - const: syscon
  31
  32   reg:
  33     maxItems: 1
  34
  35   amlogic,has-chip-id:
  36     description: |
  37       A firmware register encodes the SoC type, package and revision
  38       information on the Meson GX SoCs. If present, the interface gives
  39       the current SoC version.
  40     type: boolean
  41
  42 required:
  43   - compatible
  44   - reg
  45
  46 additionalProperties: false
  47
  48 examples:
  49   - |
  50     ao-secure@140 {
  51           compatible = "amlogic,meson-gx-ao-secure", "syscon";
  52           reg = <0x140 0x140>;
  53           amlogic,has-chip-id;
  54     };