Documentation/devicetree/bindings/mailbox/st,stm32-ipcc.yaml

   1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: "http://devicetree.org/schemas/mailbox/st,stm32-ipcc.yaml#"
   5 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
   6
   7 title: STMicroelectronics STM32 IPC controller bindings
   8
   9 description:
  10   The IPCC block provides a non blocking signaling mechanism to post and
  11   retrieve messages in an atomic way between two processors.
  12   It provides the signaling for N bidirectionnal channels. The number of
  13   channels (N) can be read from a dedicated register.
  14
  15 maintainers:
  16   - Fabien Dessenne <fabien.dessenne@st.com>
  17   - Arnaud Pouliquen <arnaud.pouliquen@st.com>
  18
  19 properties:
  20   compatible:
  21     const: st,stm32mp1-ipcc
  22
  23   reg:
  24     maxItems: 1
  25
  26   clocks:
  27      maxItems: 1
  28
  29   interrupts:
  30     items:
  31       - description: rx channel occupied
  32       - description: tx channel free
  33       - description: wakeup source
  34     minItems: 2
  35     maxItems: 3
  36
  37   interrupt-names:
  38     items:
  39       - const: rx
  40       - const: tx
  41       - const: wakeup
  42     minItems: 2
  43     maxItems: 3
  44
  45   wakeup-source: true
  46
  47   "#mbox-cells":
  48     const: 1
  49
  50   st,proc-id:
  51     description: Processor id using the mailbox (0 or 1)
  52     allOf:
  53       - $ref: /schemas/types.yaml#/definitions/uint32
  54       - enum: [ 0, 1 ]
  55
  56 required:
  57   - compatible
  58   - reg
  59   - st,proc-id
  60   - clocks
  61   - interrupt-names
  62   - "#mbox-cells"
  63   - interrupts
  64
  65 additionalProperties: false
  66
  67 examples:
  68   - |
  69     #include <dt-bindings/interrupt-controller/arm-gic.h>
  70     #include <dt-bindings/clock/stm32mp1-clks.h>
  71     ipcc: mailbox@4c001000 {
  72       compatible = "st,stm32mp1-ipcc";
  73       #mbox-cells = <1>;
  74       reg = <0x4c001000 0x400>;
  75       st,proc-id = <0>;
  76       interrupts-extended = <&intc GIC_SPI 100 IRQ_TYPE_NONE>,
  77                       <&intc GIC_SPI 101 IRQ_TYPE_NONE>,
  78                       <&aiec 62 1>;
  79       interrupt-names = "rx", "tx", "wakeup";
  80       clocks = <&rcc_clk IPCC>;
  81       wakeup-source;
  82     };
  83
  84 ...