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[PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug

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Add description for optional device tree property
'brcm,pci-hotplug' for PCI hotplug feature.

Signed-off-by: Oza Pawandeep <oza.oza@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
index b8e48b4..a3bad24 100644
--- a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -72,6 +72,29 @@ Optional properties:
 - brcm,pcie-msi-inten: Needs to be present for some older iProc platforms that
 require the interrupt enable registers to be set explicitly to enable MSI
 
+Optional properties:
+- brcm,pci-hotplug: PCI hotplug feature is supported.
+
+If the brcm,pcie-hotplug property is present, the following properties become
+effective:
+
+- brcm,prsnt-gpio: Array of gpios, needs to be present if Hotplug is supported.
+
+PCI hotplug implementation is SOC/Board specific, and also it depends on
+how add-in card is designed (e.g. how many present pins are implemented).
+
+If x8 card is connected, then it might be possible that all the
+3 present pins could go low, or at least one pin goes low.
+
+If x4 card is connected, then it might be possible that 2 present
+pins go low, or at least one pin goes low.
+
+Example:
+brcm,prsnt-gpio: <&pca9505 32 1>, <&pca9505 33 1>;
+This is x4 connector: monitoring max 2 present lines.
+brcm,prsnt-gpio: <&pca9505 32 1>, <&pca9505 33 1>, <&pca9505 34 1>;
+This is x8 connector: monitoring max 3 present lines.
+
 Example:
 	pcie0: pcie@18012000 {
 		compatible = "brcm,iproc-pcie";
-- 
1.9.1

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[PATCH 0/2] PCI hotplug feature Oza Pawandeep <oza.oza@broadcom.com> - 2017-08-08 06:50 +0200
  [PATCH 1/2] PCI: iproc: Implement PCI hotplug support Oza Pawandeep <oza.oza@broadcom.com> - 2017-08-08 06:50 +0200
  [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug Oza Pawandeep <oza.oza@broadcom.com> - 2017-08-08 06:50 +0200
    Re: [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug Rob Herring <robh+dt@kernel.org> - 2017-08-08 16:30 +0200
      Re: [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug Ray Jui <ray.jui@broadcom.com> - 2017-08-09 07:30 +0200
        Re: [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug Oza Oza <oza.oza@broadcom.com> - 2017-08-09 07:50 +0200
          Re: [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug Oza Oza <oza.oza@broadcom.com> - 2017-08-09 08:00 +0200
            Re: [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug Rob Herring <robh+dt@kernel.org> - 2017-08-10 20:10 +0200
      Re: [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug Oza Oza <oza.oza@broadcom.com> - 2017-08-09 07:30 +0200

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