linux-kernel - Re: [PATCH 3/4] dt-bindings: misc: tmr-inject: Add device-tree binding for TMR Inject

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Date:   Wed, 29 Jun 2022 13:29:31 +0200
From:   Michal Simek <michal.simek@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <michal.simek@...inx.com>, <derek.kiernan@...inx.com>,
        <dragan.cvetic@...inx.com>, <arnd@...db.de>,
        <gregkh@...uxfoundation.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <git@....com>, <git@...inx.com>
Subject: Re: [PATCH 3/4] dt-bindings: misc: tmr-inject: Add device-tree
 binding for TMR Inject



On 6/29/22 12:08, Krzysztof Kozlowski wrote:
> On 28/06/2022 07:43, Appana Durga Kedareswara rao wrote:
>> This commit adds documentation for Triple Modular Redundancy (TMR)
> 
> No "This commit"
> 
> https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95
> 
>> Inject IP.
>>
>> Signed-off-by: Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>
>> ---
>>   .../bindings/misc/xlnx,tmr-inject.yaml        | 47 +++++++++++++++++++
>>   1 file changed, 47 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/misc/xlnx,tmr-inject.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/misc/xlnx,tmr-inject.yaml b/Documentation/devicetree/bindings/misc/xlnx,tmr-inject.yaml
>> new file mode 100644
>> index 000000000000..4daf9539000b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/misc/xlnx,tmr-inject.yaml
>> @@ -0,0 +1,47 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/misc/xlnx,tmr-inject.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Xilinx TMR Inject Device Tree Bindings
> 
> Same comments.
> 
>> +
>> +maintainers:
>> +  - Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>
>> +
>> +description: |
>> +  The Triple Modular Redundancy(TMR) Inject core provides functional fault
>> +  injection by changing selected MicroBlaze instructions, which provides the
>> +  possibility to verify that the TMR subsystem error detection and fault
>> +  recovery logic is working properly.
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - xlnx,tmr-inject-1.0
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  xlnx,magic:
>> +    minimum: 0
>> +    maximum: 255
>> +    description: |
>> +      Magic number used when injecting faults. The fault inject write data least
>> +      significant byte (bits 7:0) must match this number to have any effect.
> 
> And why exactly register value is a property of DT?
> 
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - xlnx,magic
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    tmr-inject@...30000 {
> 
> fault-inject?

no problem with it but I think it would be good to extend 2.2.2 chapter in 
devicetree specification with these generic names.

Thanks,
Michal