linux-kernel - Re: [PATCH 1/4] dt-bindings: misc: tmr-manager: Add device-tree binding for TMR Manager

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Date:   Wed, 29 Jun 2022 13:45:59 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Michal Simek <michal.simek@....com>,
        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 1/4] dt-bindings: misc: tmr-manager: Add device-tree
 binding for TMR Manager

On 29/06/2022 13:23, Michal Simek wrote:
> 
> 
> On 6/29/22 12:07, Krzysztof Kozlowski wrote:
>> On 28/06/2022 07:43, Appana Durga Kedareswara rao wrote:
>>> This commit adds documentation for Triple Modular Redundancy(TMR) Manager
>>> IP. The Triple Modular Redundancy(TMR) Manager is responsible for handling
>>> the TMR subsystem state, including fault detection and error recovery
>>> provides soft error detection, correction and recovery features.
>>>
>>> Signed-off-by: Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>
>>> ---
>>>   .../bindings/misc/xlnx,tmr-manager.yaml       | 48 +++++++++++++++++++
>>
>> This is not a misc device. Find appropriate subsystem for it. It's not
>> EDAC, right?
> 
> We were thinking where to put it but it is not EDAC driver.
> If you have better suggestion for subsystem please let us know.

I don't know what's the device about. The description does not help:

"TMR Manager is responsible for TMR subsystem state..."

> 
>>
>>>   1 file changed, 48 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/misc/xlnx,tmr-manager.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/misc/xlnx,tmr-manager.yaml b/Documentation/devicetree/bindings/misc/xlnx,tmr-manager.yaml
>>> new file mode 100644
>>> index 000000000000..f6cb4d235981
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/misc/xlnx,tmr-manager.yaml
>>> @@ -0,0 +1,48 @@
>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/misc/xlnx,tmr-manager.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Xilinx TMR Microblaze Device Tree Bindings
>>
>> s/Device Tree Bindings//
>>
>>> +
>>> +maintainers:
>>> +  - Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>
>>> +
>>> +description: |
>>> +  The Triple Modular Redundancy(TMR) Manager is responsible for handling the
>>> +  TMR subsystem state, including fault detection and error recovery. The core
>>> +  is triplicated in each of the sub-blocks in the TMR subsystem, and provides
>>> +  majority voting of its internal state.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - xlnx,tmr-manager-1.0
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  xlnx,magic1:
>>> +    minimum: 0
>>> +    maximum: 255
>>> +    description:
>>> +      Magic number 1, When writing to the control register the first write data
>>> +      byte (bits 7:0) must match this value in order to have any effect on the
>>> +      nominal recovery function.
>>
>> Register values are usually not in the scope of bindings. We describe
>> here hardware, not programming model, although in case of soft cores
>> maybe it's a bit different.
> 
> you need to setup this value for every instance in design tools and it is 
> directly present in HW. It means this value is really describing HW.

OK, thanks for clarification.

Best regards,
Krzysztof