linux-kernel - RE: [PATCH V2 2/3] dt-bindings: tegra: pmc: Update scratch as an optional aperture

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Message-ID:
 <IA0PR12MB8906A78CE7A5652181720561B5492@IA0PR12MB8906.namprd12.prod.outlook.com>
Date: Sun, 11 Feb 2024 17:07:44 +0000
From: Petlozu Pravareshwar <petlozup@...dia.com>
To: Rob Herring <robh@...nel.org>
CC: "thierry.reding@...il.com" <thierry.reding@...il.com>, Jonathan Hunter
	<jonathanh@...dia.com>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	"dmitry.osipenko@...labora.com" <dmitry.osipenko@...labora.com>,
	"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>, Kartik Rajput
	<kkartik@...dia.com>, "cai.huoqing@...ux.dev" <cai.huoqing@...ux.dev>,
	Sandipan Patra <spatra@...dia.com>, "linux-tegra@...r.kernel.org"
	<linux-tegra@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>
Subject: RE: [PATCH V2 2/3] dt-bindings: tegra: pmc: Update scratch as an
 optional aperture

> On Wed, Jan 17, 2024 at 08:25:03PM +0000, Petlozu Pravareshwar wrote:
> > Scratch address space register is used to store reboot reason. For
> > some Tegra234 systems, the scratch space is not available to store the
> > reboot reason. This is because scratch region on these systems is not
> > accessible by the kernel as restricted by the Hypervisor.
> > Such systems would delist scratch aperture from PMC DT node.
> >
> > Accordingly, this change makes "scratch" as an optional aperture for
> > Tegra234 in PMC dt-binding document.
> >
> > Signed-off-by: Petlozu Pravareshwar <petlozup@...dia.com>
> > ---
> > Changes in v2:
> > - Fix dt_binding_check indentation warning.
> > - Update 'reg-names' property items list.
> >
> >  .../arm/tegra/nvidia,tegra186-pmc.yaml        | 78 ++++++++++++++-----
> >  1 file changed, 58 insertions(+), 20 deletions(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-
> pmc.yaml
> > b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-
> pmc.yaml
> > index 0faa403f68c8..79928824005d 100644
> > ---
> > a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-
> pmc.yaml
> > +++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-
> pmc.
> > +++ yaml
> > @@ -27,7 +27,7 @@ properties:
> >        - const: pmc
> >        - const: wake
> >        - const: aotag
> > -      - const: scratch
> > +      - enum: [ scratch, misc ]
> >        - const: misc
> >
> >    interrupt-controller: true
> > @@ -41,25 +41,63 @@ properties:
> >      description: If present, inverts the PMU interrupt signal.
> >      $ref: /schemas/types.yaml#/definitions/flag
> >
> > -if:
> > -  properties:
> > -    compatible:
> > -      contains:
> > -        const: nvidia,tegra186-pmc
> > -then:
> > -  properties:
> > -    reg:
> > -      maxItems: 4
> > -
> > -    reg-names:
> > -      maxItems: 4
> > -else:
> > -  properties:
> > -    reg:
> > -      minItems: 5
> > -
> > -    reg-names:
> > -      minItems: 5
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: nvidia,tegra186-pmc
> > +    then:
> > +      properties:
> > +        reg:
> > +          maxItems: 4
> > +        reg-names:
> > +          items:
> > +            - const: pmc
> > +            - const: wake
> > +            - const: aotag
> > +            - const: scratch
> 
> There is no need to define the names and order again. Just this is
> sufficient:
> 
> maxItems: 4
> contains:
>   const: scratch
> 
Agree. Will address this in the next patch.

> > +
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: nvidia,tegra194-pmc
> > +    then:
> > +      properties:
> > +        reg:
> > +          minItems: 5
> > +        reg-names:
> > +          items:
> > +            - const: pmc
> > +            - const: wake
> > +            - const: aotag
> > +            - const: scratch
> > +            - const: misc
> 
> Just 'minItems: 5' is sufficient here.
> 
Will address this in the next patch.

> > +
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: nvidia,tegra234-pmc
> > +    then:
> > +      properties:
> > +        reg:
> > +          minItems: 4
> > +          maxItems: 5
> 
> That should already be the top-level constraint.
>
Will address this in the next patch.
 
> > +        reg-names:
> > +          anyOf:
> > +            - items:
> > +                - const: pmc
> > +                - const: wake
> > +                - const: aotag
> > +                - const: misc
> > +            - items:
> > +                - const: pmc
> > +                - const: wake
> > +                - const: aotag
> > +                - const: scratch
> > +                - const: misc
> 
> Only need:
> 
> contains:
>   const: misc
Will address this in the next patch.

Thanks.