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

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Date:   Tue, 8 Aug 2023 12:28:22 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Md Danish Anwar <a0501179@...com>
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

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.

Thanks,
Conor.

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