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 20:48:15 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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 Geert,

> > +  vpcie1v5-supply:
> > +    description: The 1.5v regulator to use for PCIe.
> 
> +1.5V is only present on mini-PCIe slots...

Since mini-PCIe is a subset of PCIe, I'd think we can leave the
description as-is.

> > +
> > +  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.

I agree. I can't test it but it is trivial enough to add 12v support as
well.

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

I couldn't find one and took what I think is the most used pattern. But
I wasn't entirely sure, this is why the series is still RFC.

Thanks for the review!

   Wolfram


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