linux-kernel - Re: [PATCH v8 03/13] dt-bindings: bus: document RIFSC

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Message-ID: <9b66bc71-08de-43bd-b7e1-4e7c9defd400@foss.st.com>
Date: Fri, 5 Jan 2024 09:19:47 +0100
From: Gatien CHEVALLIER <gatien.chevallier@...s.st.com>
To: Rob Herring <robh@...nel.org>
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Subject: Re: [PATCH v8 03/13] dt-bindings: bus: document RIFSC

Hi Rob,

On 12/21/23 22:53, Rob Herring wrote:
> On Tue, Dec 12, 2023 at 04:23:46PM +0100, Gatien Chevallier wrote:
>> Document RIFSC (RIF security controller). RIFSC is a firewall controller
>> composed of different kinds of hardware resources.
>>
>> Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
>> ---
>>
>> Changes in V6:
>> 	- Renamed access-controller to access-controllers
>> 	- Removal of access-control-provider property
>> 	- Removal of access-controller and access-controller-names
>> 	  declaration in the patternProperties field. Add
>> 	  additionalProperties: true in this field.
>>
>> Changes in V5:
>> 	- Renamed feature-domain* to access-control*
>>
>> Changes in V2:
>> 	- Corrected errors highlighted by Rob's robot
>> 	- No longer define the maxItems for the "feature-domains"
>> 	  property
>> 	- Fix example (node name, status)
>> 	- Declare "feature-domain-names" as an optional
>> 	  property for child nodes
>> 	- Fix description of "feature-domains" property
>>
>>   .../bindings/bus/st,stm32mp25-rifsc.yaml      | 96 +++++++++++++++++++
>>   1 file changed, 96 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/bus/st,stm32mp25-rifsc.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/bus/st,stm32mp25-rifsc.yaml b/Documentation/devicetree/bindings/bus/st,stm32mp25-rifsc.yaml
>> new file mode 100644
>> index 000000000000..95aa7f04c739
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/bus/st,stm32mp25-rifsc.yaml
>> @@ -0,0 +1,96 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/bus/st,stm32mp25-rifsc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: STM32 Resource isolation framework security controller
>> +
>> +maintainers:
>> +  - Gatien Chevallier <gatien.chevallier@...s.st.com>
>> +
>> +description: |
>> +  Resource isolation framework (RIF) is a comprehensive set of hardware blocks
>> +  designed to enforce and manage isolation of STM32 hardware resources like
>> +  memory and peripherals.
>> +
>> +  The RIFSC (RIF security controller) is composed of three sets of registers,
>> +  each managing a specific set of hardware resources:
>> +    - RISC registers associated with RISUP logic (resource isolation device unit
>> +      for peripherals), assign all non-RIF aware peripherals to zero, one or
>> +      any security domains (secure, privilege, compartment).
>> +    - RIMC registers: associated with RIMU logic (resource isolation master
>> +      unit), assign all non RIF-aware bus master to one security domain by
>> +      setting secure, privileged and compartment information on the system bus.
>> +      Alternatively, the RISUP logic controlling the device port access to a
>> +      peripheral can assign target bus attributes to this peripheral master port
>> +      (supported attribute: CID).
>> +    - RISC registers associated with RISAL logic (resource isolation device unit
>> +      for address space - Lite version), assign address space subregions to one
>> +      security domains (secure, privilege, compartment).
>> +
>> +properties:
>> +  compatible:
>> +    contains:
>> +      const: st,stm32mp25-rifsc
> 
> This needs to be exact and include 'simple-bus'. You'll need a custom
> 'select' with the above to avoid matching all other 'simple-bus' cases.
> 
> With that,
> 
> Reviewed-by: Rob Herring <robh@...nel.org>

Thank you for the review,
I'll update this for the next version whilst applying your tag

Gatien