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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: "http://devicetree.org/schemas/mailbox/st,stm32-ipcc.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"
title: STMicroelectronics STM32 IPC controller
description:
The IPCC block provides a non blocking signaling mechanism to post and
retrieve messages in an atomic way between two processors.
It provides the signaling for N bidirectionnal channels. The number of
channels (N) can be read from a dedicated register.
maintainers:
- Fabien Dessenne <fabien.dessenne@foss.st.com>
- Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
properties:
compatible:
const: st,stm32mp1-ipcc
reg:
maxItems: 1
clocks:
maxItems: 1
interrupts:
items:
- description: rx channel occupied
- description: tx channel free
interrupt-names:
items:
- const: rx
- const: tx
wakeup-source: true
"#mbox-cells":
const: 1
st,proc-id:
description: Processor id using the mailbox (0 or 1)
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1]
required:
- compatible
- reg
- st,proc-id
- clocks
- interrupt-names
- "#mbox-cells"
- interrupts
additionalProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/clock/stm32mp1-clks.h>
ipcc: mailbox@4c001000 {
compatible = "st,stm32mp1-ipcc";
#mbox-cells = <1>;
reg = <0x4c001000 0x400>;
st,proc-id = <0>;
interrupts-extended = <&exti 61 1>,
<&intc GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "rx", "tx";
clocks = <&rcc_clk IPCC>;
wakeup-source;
};
...
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