From: Rob Herring <robh@kernel.org>
To: "Pali Rohár" <pali@kernel.org>
Cc: "Marek Behún" <kabel@kernel.org>,
devicetree@vger.kernel.org, PCI <linux-pci@vger.kernel.org>,
"Bjorn Helgaas" <helgaas@kernel.org>
Subject: Re: [PATCH dt + pci 1/2] dt-bindings: Add 'slot-power-limit-milliwatt' PCIe port property
Date: Fri, 12 Nov 2021 10:30:01 -0600 [thread overview]
Message-ID: <CAL_JsqJ+FYFFcDEm-_Ow=9TERhhEMVKm3OCHyDdGo02onK7dmg@mail.gmail.com> (raw)
In-Reply-To: <20211112153208.s4nuckz7js4fipce@pali>
On Fri, Nov 12, 2021 at 9:32 AM Pali Rohár <pali@kernel.org> wrote:
>
> On Friday 12 November 2021 09:25:20 Rob Herring wrote:
> > On Sun, Oct 31, 2021 at 04:07:05PM +0100, Marek Behún wrote:
> > > + If present, this property specifies slot power limit in milliwatts. Host
> > > + drivers can parse this property and use it for programming Root Port or host
> > > + bridge, or for composing and sending PCIe Set_Slot_Power_Limit messages
> > > + through the Root Port or host bridge when transitioning PCIe link from a
> > > + non-DL_Up Status to a DL_Up Status.
> >
> > If your slots are behind a switch, then doesn't this apply to any bridge
> > port?
>
> The main issue here is that pci.txt (and also scheme on github) is
> mixing host bridge and root ports into one node. This new property
> should be defined at the same place where is supports-clkreq or
> reset-gpios, as it belongs to them.
Unfortunately that ship has already sailed. So we can split things up,
but we still have to allow for the existing cases. I'm happy to take
changes splitting up pci-bus.yaml to 2 or 3 schemas (host bridge,
root-port, and PCI(e)-PCI(e) bridge?).
> And you are right, that this new property should be defined only for
> root ports and downstream ports of switch.
next prev parent reply other threads:[~2021-11-12 16:30 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-31 15:07 [PATCH dt + pci 1/2] dt-bindings: Add 'slot-power-limit-milliwatt' PCIe port property Marek Behún
2021-10-31 15:07 ` [PATCH dt + pci 2/2] PCI: Add function for parsing `slot-power-limit-milliwatt` DT property Marek Behún
2022-01-07 18:04 ` Marek Behún
2022-01-07 21:17 ` Rob Herring
2022-01-12 22:08 ` Bjorn Helgaas
2022-01-12 22:28 ` Pali Rohár
2022-01-13 0:00 ` Bjorn Helgaas
2021-11-12 15:25 ` [PATCH dt + pci 1/2] dt-bindings: Add 'slot-power-limit-milliwatt' PCIe port property Rob Herring
2021-11-12 15:32 ` Pali Rohár
2021-11-12 16:30 ` Rob Herring [this message]
2021-11-12 17:12 ` Pali Rohár
2021-11-12 17:24 ` Marek Behún
2021-11-12 20:56 ` Rob Herring
2021-11-13 11:31 ` Pali Rohár
2021-11-16 21:31 ` Pali Rohár
2022-01-05 14:14 ` Marek Behún
2022-01-05 14:27 ` Rob Herring
2022-01-05 15:14 ` Pali Rohár
2022-01-05 15:26 ` Rob Herring
2022-01-05 15:36 ` Pali Rohár
2022-01-05 17:11 ` Marek Behún
2022-02-18 11:31 ` Pali Rohár
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