linux-kernel - [PATCH v6 2/3] dt-bindings: PCI iproc: Implement optional property prsnt-gpios

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Date:   Thu, 31 Aug 2017 10:20:28 +0530
From:   Oza Pawandeep <oza.oza@...adcom.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>, <helgaas@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Oza Pawandeep <oza.oza@...adcom.com>,
        Andy Gospodarek <gospo@...adcom.com>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Oza Pawandeep <oza.pawandeep@...il.com>
Subject: [PATCH v6 2/3] dt-bindings: PCI iproc: Implement optional property prsnt-gpios

Add description for optional device tree property
'prsnt-gpios' for PCI hotplug feature.

Signed-off-by: Oza Pawandeep <oza.oza@...adcom.com>
Reviewed-by: Ray Jui <ray.jui@...adcom.com>
Acked-by: Rob Herring <robh@...nel.org>

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
index b8e48b4..0c5f631 100644
--- a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -72,6 +72,20 @@ 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:
+- slot-pluggable: PCI hotplug feature is supported.
+- prsnt-gpios: Array of gpios, needs to be present if Hotplug is supported.
+
+Refer to the following binding documents for more detailed description on
+the use of 'slot-pluggable' and 'prsnt-gpios'.
+  Documentation/devicetree/bindings/pci/pci.txt
+
+Example:
+prsnt-gpios: <&pca9505 32 1>, <&pca9505 33 1>;
+This is x4 connector: monitoring max 2 present lines.
+prsnt-gpios: <&pca9505 32 1>, <&pca9505 33 1>, <&pca9505 34 1>;
+This is x8 connector: monitoring max 3 present lines.
+
 Example:
 	pcie0: pcie@...12000 {
 		compatible = "brcm,iproc-pcie";
-- 
1.9.1