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authorArnaud Pouliquen <arnaud.pouliquen@st.com>2019-12-17 09:24:15 +0100
committerRob Herring <robh@kernel.org>2019-12-17 17:50:59 -0600
commit34566e4f2d681570c271bf71f8405e0c78251127 (patch)
tree2a7fd7cee2698fb4a4fa9b8d4bf96a038c7a644c /Documentation/devicetree/bindings/arm/stm32/mlahb.txt
parentdt-bindings: rtc: Convert stm32 rtc bindings to json-schema (diff)
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dt-bindings: stm32: convert mlahb to json-schema
Convert the ML-AHB bus bindings to DT schema format using json-schema Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Signed-off-by: Rob Herring <robh@kernel.org>
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-ML-AHB interconnect bindings
-
-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
-
-Required properties:
-- compatible: should be "simple-bus"
-- dma-ranges: describes 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.
-
-The Cortex-M remote processor accessed via the mlahb interconnect is described
-by a child node.
-
-Example:
-mlahb {
- compatible = "simple-bus";
- #address-cells = <1>;
- #size-cells = <1>;
- dma-ranges = <0x00000000 0x38000000 0x10000>,
- <0x10000000 0x10000000 0x60000>,
- <0x30000000 0x30000000 0x60000>;
-
- m4_rproc: m4@10000000 {
- ...
- };
-};