linux-kernel - Re: [PATCH v1 2/6] dt-bindings: memory: tegra30: emc: Replace core regulator with power domain

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Date:   Tue, 30 Mar 2021 17:23:04 -0500
From:   Rob Herring <robh@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v1 2/6] dt-bindings: memory: tegra30: emc: Replace core
 regulator with power domain

On Mon, Mar 29, 2021 at 10:45:58PM +0300, Dmitry Osipenko wrote:
> Power domain fits much better than a voltage regulator in regards to
> a proper hardware description and from a software perspective as well.
> Hence replace the core regulator with the power domain. Note that this
> doesn't affect any existing DTBs because we haven't started to use the
> regulator yet, and thus, it's okay to change it.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  .../bindings/memory-controllers/nvidia,tegra30-emc.yaml    | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra30-emc.yaml b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra30-emc.yaml
> index 0a2e2c0d0fdd..4a2edb9b8bdc 100644
> --- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra30-emc.yaml
> +++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra30-emc.yaml
> @@ -39,9 +39,10 @@ properties:
>      description:
>        Phandle of the Memory Controller node.
>  
> -  core-supply:
> +  power-domains:
> +    $ref: /schemas/types.yaml#/definitions/phandle

'power-domains' already has a type. We need to know how many (maxItems).

>      description:
> -      Phandle of voltage regulator of the SoC "core" power domain.
> +      Phandle of the SoC "core" power domain.
>  
>    operating-points-v2:
>      description:
> @@ -241,7 +242,7 @@ examples:
>  
>          nvidia,memory-controller = <&mc>;
>          operating-points-v2 = <&dvfs_opp_table>;
> -        core-supply = <&vdd_core>;
> +        power-domains = <&domain>;
>  
>          #interconnect-cells = <0>;
>  
> -- 
> 2.30.2
>