linux-kernel - Re: [RFC PATCH 1/3] dt-bindings: PCI: rcar-pci-host: add optional regulators

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Date:   Mon, 8 May 2023 15:40:57 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-renesas-soc@...r.kernel.org,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/3] dt-bindings: PCI: rcar-pci-host: add optional regulators

Hi Wolfram,

On Mon, May 8, 2023 at 12:46 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> Support regulators found on the e.g. KingFisher board.

... for the mini-PCIe slot.

> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Thanks for your patch!

> --- a/Documentation/devicetree/bindings/pci/rcar-pci-host.yaml
> +++ b/Documentation/devicetree/bindings/pci/rcar-pci-host.yaml
> @@ -68,6 +68,12 @@ properties:
>    phy-names:
>      const: pcie
>
> +  vpcie1v5-supply:
> +    description: The 1.5v regulator to use for PCIe.

+1.5V is only present on mini-PCIe slots...

> +
> +  vpcie3v3-supply:
> +    description: The 3.3v regulator to use for PCIe.

... while +3.3V is present on PCIe, mini-PCIe, and M2 PCIe slots.

In addition, normal PCIe slots also have +12V.
So I think it would be prudent to add a vpcie12v0-supply property, too.

W.r.t. to the actual naming, I don't know if there's already a (de facto)
standard for that?

> +
>  required:
>    - compatible
>    - reg
> @@ -121,5 +127,7 @@ examples:
>               clock-names = "pcie", "pcie_bus";
>               power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
>               resets = <&cpg 319>;
> +             vpcie1v5-supply = <&pcie_1v5>;
> +             vpcie3v3-supply = <&pcie_3v3>;
>           };
>      };

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds