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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: "http://devicetree.org/schemas/arm/stm32/st,mlahb.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"
title: STMicroelectronics STM32 ML-AHB interconnect bindings
maintainers:
- Fabien Dessenne <fabien.dessenne@foss.st.com>
- Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
description: |
These bindings describe the STM32 SoCs ML-AHB interconnect bus which connects
a Cortex-M subsystem with dedicated memories. The MCU SRAM and RETRAM memory
parts can be accessed through different addresses (see "RAM aliases" in [1])
using different buses (see [2]): balancing the Cortex-M firmware accesses
among those ports allows to tune the system performance.
[1]: https://www.st.com/resource/en/reference_manual/dm00327659.pdf
[2]: https://wiki.st.com/stm32mpu/wiki/STM32MP15_RAM_mapping
allOf:
- $ref: /schemas/simple-bus.yaml#
properties:
compatible:
contains:
enum:
- st,mlahb
dma-ranges:
description: |
Describe memory addresses translation between the local CPU and the
remote Cortex-M processor. Each memory region, is declared with
3 parameters:
- param 1: device base address (Cortex-M processor address)
- param 2: physical base address (local CPU address)
- param 3: size of the memory region.
maxItems: 3
'#address-cells':
const: 1
'#size-cells':
const: 1
required:
- compatible
- '#address-cells'
- '#size-cells'
- dma-ranges
unevaluatedProperties: false
examples:
- |
mlahb: ahb@38000000 {
compatible = "st,mlahb", "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
reg = <0x10000000 0x40000>;
ranges;
dma-ranges = <0x00000000 0x38000000 0x10000>,
<0x10000000 0x10000000 0x60000>,
<0x30000000 0x30000000 0x60000>;
m4_rproc: m4@10000000 {
reg = <0x10000000 0x40000>;
};
};
...
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