Re: [PATCH 2/2] dt-bindings: PCI: mediatek-gen3: Add support for controlling power and reset

[Rob Herring]

On Tue, Jan 10, 2023 at 9:28 PM Jian Yang <jian.yang@xxxxxxxxxxxx> wrote:
>
> From: "jian.yang" <jian.yang@xxxxxxxxxxxx>
>
> Add new properties to support control power supplies and reset pin of
> a downstream component.
>
> Signed-off-by: jian.yang <jian.yang@xxxxxxxxxxxx>
> ---
>  .../bindings/pci/mediatek-pcie-gen3.yaml      | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml b/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> index 7e8c7a2a5f9b..46149cc63989 100644
> --- a/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> +++ b/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> @@ -84,6 +84,29 @@ properties:
>      items:
>        enum: [ phy, mac ]
>
> +  pcie1v8-supply:
> +    description:
> +      The regulator phandle that provides 1.8V power to downstream component.
> +
> +  pcie3v3-supply:
> +    description:
> +      The regulator phandle that provides 3.3V power to downstream component.
> +
> +  pcie12v-supply:
> +    description:
> +      The regulator phandle that provides 12V power to downstream component.

While in some bindings we've allowed these in the host bridge node,
that is a mistake. These should be in the root port node. You probably
don't have one in DT, so add one.

> +
> +  dsc-reset-gpios:
> +    description:
> +      The reset GPIO of a downstream component.
> +    maxItems: 1
> +
> +  dsc-reset-msleep:

Doesn't the PCI spec define this time? We're talking about PERST#, right?

> +    description:
> +      The delay time between assertion and de-assertion of a downstream
> +      component's reset GPIO.
> +    maxItems: 1
> +
>    clocks:
>      minItems: 4
>      maxItems: 6
> --
> 2.18.0
>