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dts: bindings: mpu: add PPB and IO MPU regions #45969

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Jun 5, 2022
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dts: bindings: mpu: add PPB and IO MPU regions #45969

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2 changes: 2 additions & 0 deletions dts/bindings/base/zephyr,memory-region.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@ properties:
- "RAM"
- "RAM_NOCACHE"
- "FLASH"
- "PPB"
- "IO"
description: |
Signify that this node should result in a dedicated MPU region. The
region address and size are taken from the <reg> property, while the MPU
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10 changes: 9 additions & 1 deletion include/zephyr/linker/devicetree_regions.h
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Expand Up @@ -224,19 +224,23 @@
* to the MPU_FN macro using the 'attr' parameter, in the form
* REGION_{attr}_ATTR.
*
* Currently only three enums are supported for the 'zephyr,memory-region-mpu'
* The following enums are supported for the 'zephyr,memory-region-mpu'
* property:
*
* - RAM
* - RAM_NOCACHE
* - FLASH
* - PPB
* - IO
*
* This means that usually the arch code would provide some macros or defines
* with the same name of the extended property, that is:
*
* - REGION_RAM_ATTR
* - REGION_RAM_NOCACHE_ATTR
* - REGION_FLASH_ATTR
* - REGION_PPB_ATTR
* - REGION_IO_ATTR
*
* Example devicetree fragment:
*
Expand All @@ -249,6 +253,10 @@
* };
* };
*
* For detailed information about MPU region attribute define configuration refer
* to the specific architecture MPU header.
* For example: include/zephyr/arch/arm/aarch32/mpu/arm_mpu_v7m.h.
*
* The 'attr' parameter of the MPU_FN function will be the extended
* 'REGION_RAM_NOCACHE_ATTR' token and the arch code will be usually
* implementing a macro with the same name.
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