linux-kernel - Re: [RFC PATCH 6/7] dt-bindings: riscv: Remove "riscv,svXX" property from device-tree

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Message-ID: <56690fc1-fdc3-67d9-5a39-e92d0ec6810c@ghiti.fr>
Date:   Tue, 7 Apr 2020 01:14:52 -0400
From:   Alex Ghiti <alex@...ti.fr>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>, zong.li@...ive.com,
        anup@...infault.org, Christoph Hellwig <hch@....de>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 6/7] dt-bindings: riscv: Remove "riscv,svXX" property
 from device-tree


On 4/3/20 11:53 AM, Palmer Dabbelt wrote:
> On Sun, 22 Mar 2020 04:00:27 PDT (-0700), alex@...ti.fr wrote:
>> This property can not be used before virtual memory is set up
>> and then the  distinction between sv39 and sv48 is done at runtime
>> using SATP csr property: this property is now useless, so remove it.
>>
>> Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
>> ---
>>  Documentation/devicetree/bindings/riscv/cpus.yaml | 13 -------------
>>  1 file changed, 13 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml 
>> b/Documentation/devicetree/bindings/riscv/cpus.yaml
>> index 04819ad379c2..12baabbac213 100644
>> --- a/Documentation/devicetree/bindings/riscv/cpus.yaml
>> +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
>> @@ -39,19 +39,6 @@ properties:
>>        Identifies that the hart uses the RISC-V instruction set
>>        and identifies the type of the hart.
>>
>> -  mmu-type:
>> -    allOf:
>> -      - $ref: "/schemas/types.yaml#/definitions/string"
>> -      - enum:
>> -          - riscv,sv32
>> -          - riscv,sv39
>> -          - riscv,sv48
>> -    description:
>> -      Identifies the MMU address translation mode used on this
>> -      hart.  These values originate from the RISC-V Privileged
>> -      Specification document, available from
>> -      https://riscv.org/specifications/
>> -
>>    riscv,isa:
>>      allOf:
>>        - $ref: "/schemas/types.yaml#/definitions/string"
> 
> I'd prefer if we continue to define this in the schema: while Linux 
> won't use
> it, it's still useful for other programs that want to statically 
> determine the
> available VA widths.

Sure, I'll remove that in next version.

Thanks,

Alex