linux-kernel - Re: [PATCH v3 3/8] dt-bindings: memory-controllers: Add STM32 Octo Memory Manager controller

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Message-ID: <5dde0e21-eddb-4bbf-a246-a2760792eb59@foss.st.com>
Date: Tue, 18 Feb 2025 10:58:22 +0100
From: Patrice CHOTARD <patrice.chotard@...s.st.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof
 Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alexandre
 Torgue <alexandre.torgue@...s.st.com>,
        Philipp Zabel
	<p.zabel@...gutronix.de>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, <linux-spi@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <christophe.kerello@...s.st.com>
Subject: Re: [PATCH v3 3/8] dt-bindings: memory-controllers: Add STM32 Octo
 Memory Manager controller



On 2/13/25 09:00, Krzysztof Kozlowski wrote:
> On Mon, Feb 10, 2025 at 02:18:21PM +0100, patrice.chotard@...s.st.com wrote:
>> From: Patrice Chotard <patrice.chotard@...s.st.com>
>>
>> Add bindings for STM32 Octo Memory Manager (OMM) controller.
>>
>> OMM manages:
>>   - the muxing between 2 OSPI busses and 2 output ports.
>>     There are 4 possible muxing configurations:
>>       - direct mode (no multiplexing): OSPI1 output is on port 1 and OSPI2
>>         output is on port 2
>>       - OSPI1 and OSPI2 are multiplexed over the same output port 1
>>       - swapped mode (no multiplexing), OSPI1 output is on port 2,
>>         OSPI2 output is on port 1
>>       - OSPI1 and OSPI2 are multiplexed over the same output port 2
>>   - the split of the memory area shared between the 2 OSPI instances.
>>   - chip select selection override.
>>   - the time between 2 transactions in multiplexed mode.
>>
>> Signed-off-by: Patrice Chotard <patrice.chotard@...s.st.com>
>> ---
>>  .../memory-controllers/st,stm32mp25-omm.yaml  | 201 ++++++++++++++++++
>>  1 file changed, 201 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/memory-controllers/st,stm32mp25-omm.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/st,stm32mp25-omm.yaml b/Documentation/devicetree/bindings/memory-controllers/st,stm32mp25-omm.yaml
>> new file mode 100644
>> index 000000000000..c897e6bf490d
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/memory-controllers/st,stm32mp25-omm.yaml
>> @@ -0,0 +1,201 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/memory-controllers/st,stm32mp25-omm.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: STM32 Octo Memory Manager (OMM)
>> +
>> +maintainers:
>> +  - Patrice Chotard <patrice.chotard@...s.st.com>
>> +
>> +description: |
>> +  The STM32 Octo Memory Manager is a low-level interface that enables an
>> +  efficient OCTOSPI pin assignment with a full I/O matrix (before alternate
>> +  function map) and multiplex of single/dual/quad/octal SPI interfaces over
>> +  the same bus. It Supports up to:
>> +    - Two single/dual/quad/octal SPI interfaces
>> +    - Two ports for pin assignment
>> +
>> +properties:
>> +  compatible:
>> +    const: st,stm32mp25-omm
>> +
>> +  "#address-cells":
>> +    const: 2
>> +
>> +  "#size-cells":
>> +    const: 1
>> +
>> +  ranges:
>> +    description: |
>> +      Reflects the memory layout with four integer values per OSPI instance.
>> +      Format:
>> +      <chip-select> 0 <registers base address> <size>
>> +    minItems: 2
>> +    maxItems: 2
>> +
>> +  reg:
>> +    items:
>> +      - description: OMM registers
>> +      - description: OMM memory map area
>> +
>> +  reg-names:
>> +    items:
>> +      - const: regs
>> +      - const: memory_map
>> +
>> +  memory-region:
>> +    description: |
>> +      Memory region shared between the 2 OCTOSPI instance.
>> +      One or two phandle to a node describing a memory mapped region
>> +      depending of child number.
>> +    minItems: 1
>> +    maxItems: 2
>> +
>> +  memory-region-names:
>> +    description: |
>> +      OCTOSPI instance's name to which memory region is associated
>> +    items:
>> +      enum: [ospi1, ospi2]
>> +    minItems: 1
>> +    maxItems: 2
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +  resets:
>> +    maxItems: 1
>> +
>> +  access-controllers:
>> +    maxItems: 1
>> +
>> +  st,syscfg-amcr:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>> +    description: |
>> +      The Address Mapping Control Register (AMCR) is used to split the 256MB
>> +      memory map area shared between the 2 OSPI instance. The Octo Memory
>> +      Manager sets the AMCR depending of the memory-region configuration.
>> +      The memory split bitmask description is:
>> +        - 000: OCTOSPI1 (256 Mbytes), OCTOSPI2 unmapped
>> +        - 001: OCTOSPI1 (192 Mbytes), OCTOSPI2 (64 Mbytes)
>> +        - 010: OCTOSPI1 (128 Mbytes), OCTOSPI2 (128 Mbytes)
>> +        - 011: OCTOSPI1 (64 Mbytes), OCTOSPI2 (192 Mbytes)
>> +        - 1xx: OCTOSPI1 unmapped, OCTOSPI2 (256 Mbytes)
>> +    items:
>> +      - description: phandle to syscfg
>> +      - description: register offset within syscfg
>> +      - description: register bitmask for memory split
>> +
>> +  st,omm-req2ack-ns:
>> +    description: |
>> +      In multiplexed mode (MUXEN = 1), this field defines the time in
>> +      nanoseconds between two transactions.
> 
> default: ?

Yes, i will add the default value

> 
>> +
>> +  st,omm-cssel-ovr:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: |
>> +      Configure the chip select selector override for the 2 OCTOSPIs.
>> +      - 0: OCTOSPI1 chip select send to NCS1 OCTOSPI2 chip select send to NCS1
>> +      - 1: OCTOSPI1 chip select send to NCS2 OCTOSPI2 chip select send to NCS1
>> +      - 2: OCTOSPI1 chip select send to NCS1 OCTOSPI2 chip select send to NCS2
>> +      - 3: OCTOSPI1 chip select send to NCS2 OCTOSPI2 chip select send to NCS2
>> +    minimum: 0
>> +    maximum: 3
> 
> default: ?

ditto

> 
>> +
>> +  st,omm-mux:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: |
>> +      Configure the muxing between the 2 OCTOSPIs busses and the 2 output ports.
>> +      - 0: direct mode, default
> 
> Don't repeat constraints in free form text.
> 
ok

>> +      - 1: mux OCTOSPI1 and OCTOSPI2 to port 1
>> +      - 2: swapped mode
>> +      - 3: mux OCTOSPI1 and OCTOSPI2 to port 2
>> +    minimum: 0
>> +    maximum: 3
> 
> default: ?

i will add the default value as well

Thanks 
Patrice

> 
> None of them are required, so usually we expect defaults.
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> Best regards,
> Krzysztof
>