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From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-renesas-soc@vger.kernel.org,
	"Marek Vasut" <marek.vasut+renesas@gmail.com>,
	"Yoshihiro Shimoda" <yoshihiro.shimoda.uh@renesas.com>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Rob Herring" <robh@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 2/3] PCI: rcar-host: add support for optional regulators
Date: Tue, 9 May 2023 12:20:46 +0200	[thread overview]
Message-ID: <ZFoeftCOnSDYFfHb@ninjato> (raw)
In-Reply-To: <CAMuHMdUZUTJmrE==zf2OxaBdQGa-zS2VC7hTtcE9aD+MD7JYDQ@mail.gmail.com>

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> 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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  reply	other threads:[~2023-05-09 10:20 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-08 10:45 [RFC PATCH 0/3] KingFisher: support regulators for PCIe Wolfram Sang
2023-05-08 10:45 ` [RFC PATCH 1/3] dt-bindings: PCI: rcar-pci-host: add optional regulators Wolfram Sang
2023-05-08 11:27   ` Rob Herring
2023-05-08 13:40   ` Geert Uytterhoeven
2023-05-08 18:48     ` Wolfram Sang
2023-05-09 10:35       ` Geert Uytterhoeven
2023-05-09 12:30         ` Wolfram Sang
2023-05-08 10:45 ` [RFC PATCH 2/3] PCI: rcar-host: add support for " Wolfram Sang
2023-05-08 13:45   ` Geert Uytterhoeven
2023-05-09 10:20     ` Wolfram Sang [this message]
2023-05-08 10:45 ` [RFC PATCH 3/3] arm64: dts: renesas: ulcb-kf: add regulators for PCIe ch1 Wolfram Sang
2023-05-08 13:46   ` Geert Uytterhoeven

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