From: "Pali Rohár" <pali@kernel.org> To: "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>, "Bjorn Helgaas" <bhelgaas@google.com>, "Rob Herring" <robh+dt@kernel.org>, "Andrew Lunn" <andrew@lunn.ch>, "Thomas Petazzoni" <thomas.petazzoni@bootlin.com>, "Krzysztof Wilczyński" <kw@linux.com>, "Marek Behún" <kabel@kernel.org>, "Russell King" <rmk+kernel@armlinux.org.uk> Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 2/4] dt-bindings: Add 'slot-power-limit-milliwatt' PCIe port property Date: Tue, 12 Apr 2022 11:49:44 +0200 [thread overview] Message-ID: <20220412094946.27069-3-pali@kernel.org> (raw) In-Reply-To: <20220412094946.27069-1-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> --- This change was already accepted into dt-schema repo by Rob Herring: https://github.com/devicetree-org/dt-schema/pull/66 --- 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..b0cc133ed00d 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-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 ------------------------- -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: "Pali Rohár" <pali@kernel.org> To: "Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>, "Bjorn Helgaas" <bhelgaas@google.com>, "Rob Herring" <robh+dt@kernel.org>, "Andrew Lunn" <andrew@lunn.ch>, "Thomas Petazzoni" <thomas.petazzoni@bootlin.com>, "Krzysztof Wilczyński" <kw@linux.com>, "Marek Behún" <kabel@kernel.org>, "Russell King" <rmk+kernel@armlinux.org.uk> Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 2/4] dt-bindings: Add 'slot-power-limit-milliwatt' PCIe port property Date: Tue, 12 Apr 2022 11:49:44 +0200 [thread overview] Message-ID: <20220412094946.27069-3-pali@kernel.org> (raw) In-Reply-To: <20220412094946.27069-1-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> --- This change was already accepted into dt-schema repo by Rob Herring: https://github.com/devicetree-org/dt-schema/pull/66 --- 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..b0cc133ed00d 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-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 ------------------------- -- 2.20.1
next prev parent reply other threads:[~2022-04-12 9:53 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-04-12 9:49 [PATCH v5 0/4] PCI: mvebu: Slot support Pali Rohár 2022-04-12 9:49 ` Pali Rohár 2022-04-12 9:49 ` [PATCH v5 1/4] PCI: Add PCI_EXP_SLTCTL_ASPL_DISABLE macro Pali Rohár 2022-04-12 9:49 ` Pali Rohár 2022-04-12 9:49 ` Pali Rohár [this message] 2022-04-12 9:49 ` [PATCH v5 2/4] dt-bindings: Add 'slot-power-limit-milliwatt' PCIe port property Pali Rohár 2022-04-12 9:49 ` [PATCH v5 3/4] PCI: Add function for parsing 'slot-power-limit-milliwatt' DT property Pali Rohár 2022-04-12 9:49 ` Pali Rohár 2022-04-13 20:24 ` Bjorn Helgaas 2022-04-13 20:24 ` Bjorn Helgaas 2022-04-21 20:14 ` Pali Rohár 2022-04-21 20:14 ` Pali Rohár 2022-04-22 10:06 ` Lorenzo Pieralisi 2022-04-22 10:06 ` Lorenzo Pieralisi 2022-04-12 9:49 ` [PATCH v5 4/4] PCI: mvebu: Add support for sending Set_Slot_Power_Limit message Pali Rohár 2022-04-12 9:49 ` Pali Rohár 2022-04-25 9:59 ` (subset) [PATCH v5 0/4] PCI: mvebu: Slot support Lorenzo Pieralisi 2022-04-25 9:59 ` Lorenzo Pieralisi
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