linux-kernel - [RFC PATCH 02/21] dt-bindings: PCI: Endpoint: Add DT bindings for PCI EPF Device

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Date:   Thu, 26 Sep 2019 16:59:14 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Rob Herring <robh+dt@...nel.org>, Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     Mark Rutland <mark.rutland@....com>, <kishon@...com>,
        <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-ntb@...glegroups.com>
Subject: [RFC PATCH 02/21] dt-bindings: PCI: Endpoint: Add DT bindings for PCI EPF Device

Add device tree bindings for PCI endpoint function device. The
nodes for PCI endpoint function device should be attached to
PCI endpoint function bus.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 .../bindings/pci/endpoint/pci-epf.txt         | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/endpoint/pci-epf.txt

diff --git a/Documentation/devicetree/bindings/pci/endpoint/pci-epf.txt b/Documentation/devicetree/bindings/pci/endpoint/pci-epf.txt
new file mode 100644
index 000000000000..f006395fd526
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/endpoint/pci-epf.txt
@@ -0,0 +1,28 @@
+PCI Endpoint Function Device
+
+This describes the generic bindings to be used when a device has to be
+exposed to the remote host over PCIe. The device could be an actual
+peripheral in the platform or a virtual device created by the software.
+
+epcs : phandle to the endpoint controller device
+epc-names : the names of the endpoint controller device corresponding
+	    to the EPCs present in the *epcs* phandle
+vendor-id: used to identify device manufacturer
+device-id: used to identify a particular device
+baseclass-code: used to classify the type of function the device performs
+subclass-code: used to identify more specifically the function of the device
+subsys-vendor-id: used to identify vendor of the add-in card or subsystem
+subsys-id: used to specify an id that is specific to a vendor
+
+Example:
+Following is an example of NTB device exposed to the remote host.
+
+ntb {
+	compatible = "pci-epf-ntb";
+	epcs = <&pcie0_ep>, <&pcie1_ep>;
+	epc-names = "primary", "secondary";
+	vendor-id = /bits/ 16 <0x104c>;
+	device-id = /bits/ 16 <0xb00d>;
+	num-mws = <4>;
+	mws-size = <0x100000>, <0x100000>, <0x100000>, <0x100000>;
+};
-- 
2.17.1