From: Karl Li <karl.li@xxxxxxxxxxxx> Add devicetree binding for apu-mailbox. MediaTek APU (AI Processing Unit) is a microcontroller unit designed for AI acceleration tasks. The MediaTek APU-Mailbox facilitates communication with the APU microcontroller. Signed-off-by: Karl Li <karl.li@xxxxxxxxxxxx> --- .../mailbox/mediatek,apu-mailbox.yaml | 60 +++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/mediatek,apu-mailbox.yaml diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,apu-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,apu-mailbox.yaml new file mode 100644 index 000000000000..fdb0dec5fb78 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/mediatek,apu-mailbox.yaml @@ -0,0 +1,60 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mailbox/mediatek,apu-mailbox.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: MediaTek APU mailbox + +maintainers: + - Karl Li <Karl.Li@xxxxxxxxxxxx> + +description: + MediaTek APU (AI Processing Unit) is a microcontroller unit + designed for AI acceleration tasks. The MediaTek APU-Mailbox + facilitates communication with the APU microcontroller. + Within the MediaTek APU subsystem, a message passing mechanism is + built on top of the mailbox system. The mailbox only has limited + space for each message. The firmware expects the message header + from the mailbox, while the message body is passed through some + fixed shared memory. + +properties: + compatible: + const: mediatek,mt8196-apu-mailbox + + "#mbox-cells": + const: 1 + description: + The cell describe which channel the device will use. + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + +required: + - compatible + - "#mbox-cells" + - reg + - interrupts + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + #include <dt-bindings/interrupt-controller/irq.h> + + soc { + #address-cells = <2>; + #size-cells = <2>; + + mailbox@4c200000 { + compatible = "mediatek,mt8196-apu-mailbox"; + reg = <0 0x4c200000 0 0xfffff>; + interrupts = <GIC_SPI 638 IRQ_TYPE_LEVEL_HIGH 0>; + #mbox-cells = <1>; + }; + }; -- 2.18.0
