linux-kernel - Re: [RFC PATCH 2/3] PCI: rcar-host: add support for optional regulators

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Message-ID: <ZFoeftCOnSDYFfHb@ninjato>
Date:   Tue, 9 May 2023 12:20:46 +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>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/3] PCI: rcar-host: add support for optional
 regulators


> I don't know if PCIe specifies some ordering w.r.t. power supply
> enablement.

I found this which is good enough for me:

"There is no requirement for supply sequencing in either
PCI Express or PCI Express Mini Card; the supplies may
come up or go down in any order." [1]

Thanks, Linear Technology!

[1] https://www.analog.com/media/en/reference-design-documentation/design-notes/dn346f.pdf


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