linux-kernel - Re: [PATCH 03/21] dt-bindings: gpu: img: Power domain details

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Message-ID: <20241105-disarm-baggie-e2563299a24f@spud>
Date: Tue, 5 Nov 2024 18:05:54 +0000
From: Conor Dooley <conor@...nel.org>
To: Matt Coster <matt.coster@...tec.com>
Cc: Frank Binns <frank.binns@...tec.com>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>, dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Randolph Sapp <rs@...com>,
	Darren Etheridge <detheridge@...com>
Subject: Re: [PATCH 03/21] dt-bindings: gpu: img: Power domain details

On Tue, Nov 05, 2024 at 03:58:09PM +0000, Matt Coster wrote:
> The single existing GPU (AXE-1-16M) only requires a single power domain.
> Subsequent patches will add support for BXS-4-64 MC1, which has two power
> domains. Add infrastructure now to allow for this.
> 
> Signed-off-by: Matt Coster <matt.coster@...tec.com>
> ---
>  .../devicetree/bindings/gpu/img,powervr-rogue.yaml | 29 +++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> index 6924831d3e9dd9b2b052ca8f9d7228ff25526532..55f422be1bc5b7564e3e81f24c4b93857f3e12fe 100644
> --- a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> +++ b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> @@ -49,7 +49,16 @@ properties:
>      maxItems: 1
>  
>    power-domains:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
> +
> +  power-domain-names:
> +    oneOf:
> +      - items:
> +          - const: a
> +      - items:
> +          - const: a
> +          - const: b
>  
>  required:
>    - compatible
> @@ -57,10 +66,27 @@ required:
>    - clocks
>    - clock-names
>    - interrupts
> +  - power-domains
> +  - power-domain-names

A new required property is an ABI break. Please explain why this is
acceptable in your commit message.

>  
>  additionalProperties: false
>  
>  allOf:
> +  # Cores with a single power domain
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            anyOf:
> +              - const: img,img-axe-1-16m
> +    then:
> +      properties:
> +        power-domains:
> +          minItems: 1
> +          maxItems: 1
> +        power-domain-names:
> +          items:
> +            - const: a
>    # Vendor integrations using a single clock domain
>    - if:
>        properties:
> @@ -90,4 +116,5 @@ examples:
>          clock-names = "core";
>          interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>;
>          power-domains = <&k3_pds 187 TI_SCI_PD_EXCLUSIVE>;
> +        power-domain-names = "a";
>      };
> 
> -- 
> 2.47.0
> 

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