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Subject[PATCH v3 03/15] dt-bindings: mailbox: Add a sunxi message box binding
Date
This mailbox hardware is present in Allwinner sun8i, sun9i, and sun50i
SoCs. Add a device tree binding for it.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
.../mailbox/allwinner,sunxi-msgbox.yaml | 79 +++++++++++++++++++
1 file changed, 79 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mailbox/allwinner,sunxi-msgbox.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/allwinner,sunxi-msgbox.yaml b/Documentation/devicetree/bindings/mailbox/allwinner,sunxi-msgbox.yaml
new file mode 100644
index 000000000000..f34a1909ab2e
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/allwinner,sunxi-msgbox.yaml
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/allwinner,sunxi-msgbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner sunxi Message Box
+
+maintainers:
+ - Samuel Holland <samuel@sholland.org>
+
+description: |
+ The hardware message box on sun6i and newer sunxi SoCs is a two-user mailbox
+ controller containing 8 unidirectional FIFOs. An interrupt is raised for
+ received messages, but software must poll to know when a transmitted message
+ has been acknowledged by the remote user. Each FIFO can hold four 32-bit
+ messages; when a FIFO is full, clients must wait before more transmissions.
+
+ Refer to ./mailbox.txt for generic information about mailbox device-tree
+ bindings.
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - allwinner,sun8i-a83t-msgbox
+ - allwinner,sun8i-h3-msgbox
+ - allwinner,sun9i-a80-msgbox
+ - allwinner,sun50i-a64-msgbox
+ - allwinner,sun50i-h6-msgbox
+ - const: allwinner,sun6i-a31-msgbox
+ - items:
+ - const: allwinner,sun6i-a31-msgbox
+
+ reg:
+ items:
+ - description: MMIO register range
+
+ clocks:
+ maxItems: 1
+ description: bus clock
+
+ resets:
+ maxItems: 1
+ description: bus reset
+
+ interrupts:
+ maxItems: 1
+ description: controller interrupt
+
+ '#mbox-cells':
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - resets
+ - interrupts
+ - '#mbox-cells'
+
+examples:
+ - |
+ #include <dt-bindings/clock/sun8i-h3-ccu.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ #include <dt-bindings/reset/sun8i-h3-ccu.h>
+
+ msgbox: mailbox@1c17000 {
+ compatible = "allwinner,sun8i-h3-msgbox",
+ "allwinner,sun6i-a31-msgbox";
+ reg = <0x01c17000 0x1000>;
+ clocks = <&ccu CLK_BUS_MSGBOX>;
+ resets = <&ccu RST_BUS_MSGBOX>;
+ interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>;
+ #mbox-cells = <1>;
+ };
+
+...
--
2.19.2
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