| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/mailbox/allwinner,sun6i-a31-msgbox.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Allwinner sunxi Message Box |
| 8 | |
| 9 | maintainers: |
| 10 | - Samuel Holland <samuel@sholland.org> |
| 11 | |
| 12 | description: | |
| 13 | The hardware message box on sun6i, sun8i, sun9i, and sun50i SoCs is a |
| 14 | two-user mailbox controller containing 8 unidirectional FIFOs. An interrupt |
| 15 | is raised for received messages, but software must poll to know when a |
| 16 | transmitted message has been acknowledged by the remote user. Each FIFO can |
| 17 | hold four 32-bit messages; when a FIFO is full, clients must wait before |
| 18 | attempting more transmissions. |
| 19 | |
| 20 | Refer to ./mailbox.txt for generic information about mailbox device-tree |
| 21 | bindings. |
| 22 | |
| 23 | properties: |
| 24 | compatible: |
| 25 | oneOf: |
| 26 | - items: |
| 27 | - enum: |
| 28 | - allwinner,sun8i-a83t-msgbox |
| 29 | - allwinner,sun8i-h3-msgbox |
| 30 | - allwinner,sun9i-a80-msgbox |
| 31 | - allwinner,sun50i-a64-msgbox |
| 32 | - allwinner,sun50i-h6-msgbox |
| 33 | - const: allwinner,sun6i-a31-msgbox |
| 34 | - const: allwinner,sun6i-a31-msgbox |
| 35 | |
| 36 | reg: |
| 37 | maxItems: 1 |
| 38 | |
| 39 | clocks: |
| 40 | maxItems: 1 |
| 41 | description: bus clock |
| 42 | |
| 43 | resets: |
| 44 | maxItems: 1 |
| 45 | description: bus reset |
| 46 | |
| 47 | interrupts: |
| 48 | maxItems: 1 |
| 49 | |
| 50 | '#mbox-cells': |
| 51 | const: 1 |
| 52 | description: first cell is the channel number (0-7) |
| 53 | |
| 54 | required: |
| 55 | - compatible |
| 56 | - reg |
| 57 | - clocks |
| 58 | - resets |
| 59 | - interrupts |
| 60 | - '#mbox-cells' |
| 61 | |
| 62 | additionalProperties: false |
| 63 | |
| 64 | examples: |
| 65 | - | |
| 66 | #include <dt-bindings/clock/sun8i-h3-ccu.h> |
| 67 | #include <dt-bindings/interrupt-controller/arm-gic.h> |
| 68 | #include <dt-bindings/reset/sun8i-h3-ccu.h> |
| 69 | |
| 70 | msgbox: mailbox@1c17000 { |
| 71 | compatible = "allwinner,sun8i-h3-msgbox", |
| 72 | "allwinner,sun6i-a31-msgbox"; |
| 73 | reg = <0x01c17000 0x1000>; |
| 74 | clocks = <&ccu CLK_BUS_MSGBOX>; |
| 75 | resets = <&ccu RST_BUS_MSGBOX>; |
| 76 | interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>; |
| 77 | #mbox-cells = <1>; |
| 78 | }; |
| 79 | |
| 80 | ... |