linux-kernel - Re: [PATCH 1/6] dt-bindings: ti,sci: Add ti,ctx-memory-region property

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Date:   Fri, 22 Apr 2022 14:02:19 -0500
From:   Andrew Davis <afd@...com>
To:     Dave Gerlach <d-gerlach@...com>, Rob Herring <robh+dt@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Tero Kristo <kristo@...nel.org>, Nishanth Menon <nm@...com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH 1/6] dt-bindings: ti,sci: Add ti,ctx-memory-region
 property

On 4/21/22 3:36 PM, Dave Gerlach wrote:
> Add documentation for the ti,ctx-memory-region property which is a
> phandle to a reserved-memory carveout to be used by the ti_sci driver
> storage of low power mode memory context. This is optional for normal
> system operation but required to enabled suspend-to-mem usage of Deep
> Sleep state.
> 
> Signed-off-by: Dave Gerlach <d-gerlach@...com>
> ---
>   .../devicetree/bindings/arm/keystone/ti,sci.yaml         | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
> index 34f5f877d444..ec88aa88a2a0 100644
> --- a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
> +++ b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
> @@ -61,6 +61,15 @@ properties:
>     mboxes:
>       minItems: 2
>   
> +  ti,ctx-memory-region:
> +    description:
> +      Phandle to the reserved memory node to be associated with the
> +      ti-sci device, to be used for saving low power context. The
> +      reserved memory node should be a carveout node, and should
> +      be defined as per the bindings in
> +      Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml
> +    $ref: /schemas/types.yaml#/definitions/string
> +


Why does this have to be yet another reserved carveout region,
should be dynamically allocated.

Andrew


>     ti,system-reboot-controller:
>       description: Determines If system reboot can be triggered by SoC reboot
>       type: boolean