[PATCH RFC 1/2] dt-bindings: arm: Document reboot mode magic

[Elliot Berman]

On 10/31/2023 10:48 AM, Rob Herring wrote:
> On Mon, Oct 30, 2023 at 02:31:33PM -0700, Elliot Berman wrote:
>> Add bindings to describe vendor-specific reboot modes. Values here
>> correspond to valid parameters to vendor-specific reset types in PSCI
>> SYSTEM_RESET2 call.
>>
>> Signed-off-by: Elliot Berman <quic_eberman at quicinc.com>
>> ---
>>  Documentation/devicetree/bindings/arm/psci.yaml | 13 +++++++++++++
>>  1 file changed, 13 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
>> index 0c5381e081bd..dc23e901bd0a 100644
>> --- a/Documentation/devicetree/bindings/arm/psci.yaml
>> +++ b/Documentation/devicetree/bindings/arm/psci.yaml
>> @@ -122,6 +122,19 @@ patternProperties:
>>        [3] Documentation/devicetree/bindings/power/power-domain.yaml
>>        [4] Documentation/devicetree/bindings/power/domain-idle-state.yaml
>>  
>> +  "^reboot-mode-.*$":
>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
>> +    minItems: 1
>> +    maxItems: 2
>> +    description: |
>> +      Describes a vendor-specific reset type. The string after "reboot-mode-"
>> +      maps a reboot mode to the parameters in the PSCI SYSTEM_RESET2 call.
>> +
>> +      Parameters are named reboot-mode-xxx = <type[, cookie]>, where xxx
>> +      is the name of the magic reboot mode, type is the lower 31 bits
>> +      of the reset_type, and, optionally, the cookie value. If the cookie
>> +      is not provided, it is defaulted to zero.
> 
> Please use and possibly extend the existing reboot-mode binding.
> 

Sure, I can do that. I noticed most of the reboot-mode devices not doing that, but they probably should.

I've sent patches to fix that:

https://lore.kernel.org/all/20231031-ref-reboot-mode-v1-1-18dde4faf7e8@quicinc.com/
https://lore.kernel.org/all/20231031-ref-nvmem-reboot-mode-v1-1-c1af9070ce52@quicinc.com/

>> +
>>  required:
>>    - compatible
>>    - method
>>
>> -- 
>> 2.41.0
>>