136 lines
3.4 KiB
YAML
136 lines
3.4 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/mailbox/fsl,mu.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: NXP i.MX Messaging Unit (MU)
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maintainers:
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- Dong Aisheng <aisheng.dong@nxp.com>
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description: |
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The Messaging Unit module enables two processors within the SoC to
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communicate and coordinate by passing messages (e.g. data, status
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and control) through the MU interface. The MU also provides the ability
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for one processor to signal the other processor using interrupts.
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Because the MU manages the messaging between processors, the MU uses
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different clocks (from each side of the different peripheral buses).
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Therefore, the MU must synchronize the accesses from one side to the
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other. The MU accomplishes synchronization using two sets of matching
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registers (Processor A-facing, Processor B-facing).
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properties:
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compatible:
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oneOf:
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- const: fsl,imx6sx-mu
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- const: fsl,imx7ulp-mu
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- const: fsl,imx8ulp-mu
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- const: fsl,imx8-mu-scu
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- const: fsl,imx8-mu-seco
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- const: fsl,imx93-mu-s4
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- const: fsl,imx8ulp-mu-s4
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- items:
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- const: fsl,imx93-mu
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- const: fsl,imx8ulp-mu
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- items:
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- enum:
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- fsl,imx7s-mu
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- fsl,imx8mq-mu
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- fsl,imx8mm-mu
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- fsl,imx8mn-mu
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- fsl,imx8mp-mu
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- fsl,imx8qm-mu
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- fsl,imx8qxp-mu
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- const: fsl,imx6sx-mu
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- description: To communicate with i.MX8 SCU with fast IPC
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items:
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- const: fsl,imx8-mu-scu
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- enum:
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- fsl,imx8qm-mu
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- fsl,imx8qxp-mu
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- const: fsl,imx6sx-mu
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reg:
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maxItems: 1
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interrupts:
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minItems: 1
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maxItems: 2
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interrupt-names:
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minItems: 1
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items:
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- const: tx
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- const: rx
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"#mbox-cells":
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description: |
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<&phandle type channel>
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phandle : Label name of controller
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type : Channel type
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channel : Channel number
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This MU support 5 type of unidirectional channels, each type
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has 4 channels except RST channel which only has 1 channel.
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A total of 17 channels. Following types are
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supported:
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0 - TX channel with 32bit transmit register and IRQ transmit
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acknowledgment support.
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1 - RX channel with 32bit receive register and IRQ support
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2 - TX doorbell channel. Without own register and no ACK support.
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3 - RX doorbell channel.
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4 - RST channel
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const: 2
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clocks:
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maxItems: 1
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fsl,mu-side-b:
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description: boolean, if present, means it is for side B MU.
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type: boolean
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power-domains:
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maxItems: 1
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required:
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- compatible
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- reg
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- interrupts
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- "#mbox-cells"
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allOf:
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- if:
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properties:
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compatible:
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enum:
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- fsl,imx93-mu-s4
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then:
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properties:
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interrupt-names:
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minItems: 2
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interrupts:
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minItems: 2
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else:
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properties:
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interrupts:
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maxItems: 1
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not:
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required:
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- interrupt-names
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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mailbox@5d1b0000 {
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compatible = "fsl,imx8qxp-mu", "fsl,imx6sx-mu";
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reg = <0x5d1b0000 0x10000>;
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interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
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#mbox-cells = <2>;
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};
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