From: "Pali Rohár" <pali@kernel.org>
To: "Marek Behún" <kabel@kernel.org>
Cc: devicetree@vger.kernel.org, robh+dt@kernel.org,
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, 18 Feb 2022 12:31:52 +0100 [thread overview]
Message-ID: <20220218113152.ttoebrmhlwdvzqxe@pali> (raw)
In-Reply-To: <20211031150706.27873-1-kabel@kernel.org>
On Sunday 31 October 2021 16:07:05 Marek Behún wrote:
> From: Pali Rohár <pali@kernel.org>
>
> This property specifies slot power limit in mW unit. It is a form-factor
> and board specific value and must be initialized by hardware.
>
> Some PCIe controllers delegate this work to software to allow hardware
> flexibility and therefore this property basically specifies what should
> host bridge program into PCIe Slot Capabilities registers.
>
> The property needs to be specified in mW unit instead of the special format
> defined by Slot Capabilities (which encodes scaling factor or different
> unit). Host drivers should convert the value from mW to needed format.
>
> Signed-off-by: Pali Rohár <pali@kernel.org>
> Signed-off-by: Marek Behún <kabel@kernel.org>
> ---
> Documentation/devicetree/bindings/pci/pci.txt | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt
> index 6a8f2874a24d..7296d599c5ac 100644
> --- a/Documentation/devicetree/bindings/pci/pci.txt
> +++ b/Documentation/devicetree/bindings/pci/pci.txt
> @@ -32,6 +32,12 @@ driver implementation may support the following properties:
> root port to downstream device and host bridge drivers can do programming
> which depends on CLKREQ signal existence. For example, programming root port
> not to advertise ASPM L1 Sub-States support if there is no CLKREQ signal.
> +- slot-power-limit-miliwatt:
^^^^^^^^
typo: milliwatt
> + 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.
>
> PCI-PCI Bridge properties
> -------------------------
> --
> 2.32.0
>
prev parent reply other threads:[~2022-02-18 11:32 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
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 [this message]
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