linux-kernel - Re: [PATCH 2/3] dt-bindings: remoteproc: stm32_rproc: update for firmware synchronization

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Date:   Fri, 11 Sep 2020 15:49:59 +0200
From:   Arnaud POULIQUEN <arnaud.pouliquen@...com>
To:     Rob Herring <robh@...nel.org>
CC:     Alexandre TORGUE <alexandre.torgue@...com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Fabien DESSENNE <fabien.dessenne@...com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH 2/3] dt-bindings: remoteproc: stm32_rproc: update for
 firmware synchronization

Hi Rob,

On 9/9/20 10:22 PM, Rob Herring wrote:
> On Thu, Aug 27, 2020 at 09:21:00AM +0200, Arnaud Pouliquen wrote:
>> Add new properties description used to attach to a pre-loaded
>> firmware according to the commit 9276536f455b3
>> ("remoteproc: stm32: Parse syscon that will manage M4 synchronisation")
>> which updates the driver part.
>>
>> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
>> ---
>>  .../bindings/remoteproc/st,stm32-rproc.yaml   | 19 +++++++++++++++++++
>>  1 file changed, 19 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> index 4ffa25268fcc..e50957d86b1c 100644
>> --- a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> +++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> @@ -96,6 +96,25 @@ properties:
>>          3rd cell: register bitmask for the deep sleep bit
>>      maxItems: 1
>>  
>> +  st,syscfg-m4-state:
>> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"
>> +    description: |
>> +      Reference to the tamp register which exposes the Cortex-M4 state.
>> +        1st cell: phandle to syscon block
>> +        2nd cell: register offset containing the Cortex-M4 state
>> +        3rd cell: register bitmask for the Cortex-M4 state
>> +    maxItems: 1
>> +
>> +  st,syscfg-rsc-tbl:
>> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"
>> +    description: |
>> +      Reference to the tamp register which references the Cortex-M4
>> +      resource table address.
>> +        1st cell: phandle to syscon block
>> +        2nd cell: register offset containing the resource table address
>> +        3rd cell: register bitmask for the resource table address
>> +    maxItems: 1
> 
> Why can't these be implied? You can lookup the tamp syscon by 
> compatible.

I just made a copy/past of the  "st,syscfg-pdds" syscon description available in the same file [1]
  
I can provide a shorter descriptions, something like this:

   description: |
     Reference to the tamp syscon register and bitmask which contains the Cortex-M4
      resource table address.
   maxItems: 1

Would this meet your expectations? If yes, I will also add in next version an extra patch to fix [1]

[1] https://elixir.bootlin.com/linux/v5.9-rc3/source/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml#L90

> 
> Please add these to the example.

I will extend the example with these properties

Thanks,
Arnaud

> 
>> +
>>    st,auto-boot:
>>      $ref: /schemas/types.yaml#/definitions/flag
>>      description:
>> -- 
>> 2.17.1
>>