linux-kernel - Re: [PATCH 1/3] dt-bindings: reset: syscon-reboot: Add priority property

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Date:   Mon, 22 Aug 2022 15:50:50 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Marek Behún <kabel@...nel.org>
Subject: Re: [PATCH 1/3] dt-bindings: reset: syscon-reboot: Add priority
 property

On Monday 22 August 2022 07:47:28 Rob Herring wrote:
> On Sat, Aug 20, 2022 at 12:29:23PM +0200, Pali Rohár wrote:
> > This new optional priority property allows to specify custom priority level
> > of reset device. Default level was always 192.
> 
> Why do we need/want this? What problem does it solve?

See patch 3/3.

> > Signed-off-by: Pali Rohár <pali@...nel.org>
> > ---
> >  .../devicetree/bindings/power/reset/syscon-reboot.yaml        | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot.yaml b/Documentation/devicetree/bindings/power/reset/syscon-reboot.yaml
> > index da2509724812..d905133aab27 100644
> > --- a/Documentation/devicetree/bindings/power/reset/syscon-reboot.yaml
> > +++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot.yaml
> > @@ -42,6 +42,10 @@ properties:
> >      $ref: /schemas/types.yaml#/definitions/uint32
> >      description: The reset value written to the reboot register (32 bit access).
> >  
> > +  priority:
> 
> A bit too generic for the name.
> 
> > +    $ref: /schemas/types.yaml#/definitions/sint32
> > +    description: Priority level of this syscon reset device. Default 192.
> 
> default: 192
> 
> 
> Though I'm not really sure about the whole concept of this in DT. Where 
> does 192 come from?

Implicitly from the current implementation and how it is used.

> Presumably if we have more than 1 reset device, then 
> 'priority' is needed in multiple places. So you need a common schema 
> defining the property (as property types should be defined exactly 
> once) which this schema can reference.
> 
> Rob

Sorry, I do not understand.