linux-kernel - Re: [PATCH] dt-bindings: remoteproc: pru: Add Interrupt property

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Date:   Fri, 11 Aug 2023 16:48:28 +0530
From:   Md Danish Anwar <a0501179@...com>
To:     Conor Dooley <conor@...nel.org>
CC:     MD Danish Anwar <danishanwar@...com>, Suman Anna <s-anna@...com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <vigneshr@...com>,
        <srk@...com>, <nm@...com>
Subject: Re: [PATCH] dt-bindings: remoteproc: pru: Add Interrupt property

Hi Conor,

On 08/08/23 4:58 pm, Conor Dooley wrote:
> On Tue, Aug 08, 2023 at 04:30:32PM +0530, Md Danish Anwar wrote:
>> On 08/08/23 4:18 pm, Conor Dooley wrote:
>>> On Tue, Aug 08, 2023 at 03:14:31PM +0530, Md Danish Anwar wrote:
>>>> On 07/08/23 8:09 pm, Conor Dooley wrote:
>>>>> On Mon, Aug 07, 2023 at 04:38:36PM +0530, MD Danish Anwar wrote:
>>>>>> Add interrupts and interrupt-names protperties for PRU and RTU cores.
>>>>>>
>>>>>> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>>>>>> ---
>>>>>>  .../bindings/remoteproc/ti,pru-rproc.yaml     | 22 +++++++++++++++++++
>>>>>>  1 file changed, 22 insertions(+)
>>>>>>
>>>>>> diff --git a/Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.yaml
>>>>>> index cd55d80137f7..6970316943bb 100644
>>>>>> --- a/Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.yaml
>>>>>> +++ b/Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.yaml
>>>>>> @@ -66,6 +66,16 @@ properties:
>>>>>>        Should contain the name of the default firmware image
>>>>>>        file located on the firmware search path.
>>>>>>  
>>>>>> +  interrupts:
>>>>>> +    maxItems: 1
>>>>>> +    description:
>>>>>> +      Interrupt specifiers enable the virtio/rpmsg communication between MPU
>>>>>> +      and the PRU/RTU cores.
>>>>>> +
>>>>>> +  interrupt-names:
>>>>>> +    items:
>>>>>> +      - const: vring
>>>>>> +
>>>>>>  if:
>>>>>>    properties:
>>>>>>      compatible:
>>>>>> @@ -171,6 +181,9 @@ examples:
>>>>>>                <0x22400 0x100>;
>>>>>>          reg-names = "iram", "control", "debug";
>>>>>>          firmware-name = "am65x-pru0_0-fw";
>>>>>> +        interrupt-parent = <&icssg0_intc>;
>>>>>> +        interrupts = <16 2 2>;
>>>>>> +        interrupt-names = "vring";
>>>>>>        };
>>>>>
>>>>> These examples would probably be more helpful if they used the
>>>>> appropriate defines, no?
>>>>>
>>>>
>>>> PRUSS Interrupt controller doesn't have any appropriate defines. This doesn't
>>>> use GIC so defines from arm-gic.h can not be used here. These are specific to
>>>> PRUSS INTC.
>>>
>>> I was deliberately vague in case the gic stuff applied too, but my main
>>> question was about the standard defines used for interrupt types.
>>>
>>
>> There are no standard defines for these interrupt types. However I can create a
>> new .h file defining all the three interrupt cells and their values for both
>> PRU and RTU cores if you think that is required. Otherwise we can go with
>> hardcoded values.
>>
>> Please let me know what you think should be done here.
> 
> It'd be good to reference to the documentation for the cells, I don't
> think adding a header is necessary here.
> 

How should I reference to the documentation for the cells?

Should I just add the details of cells in description of interrupt property here.

  interrupts:
    maxItems: 1
    description:
      Interrupt specifiers enable the virtio/rpmsg communication between MPU
      and the PRU/RTU cores. The value of the interrupts should be the PRU
      System event number [cell 1], PRU channel [cell 2] and PRU host_event
      (target) [cell 3].

Please let me know if this looks OK to you.


> Thanks,
> Conor.

-- 
Thanks and Regards,
Danish.