PCI: designware: Add driver for prototyping kits based on ARC SDP

[mirror_ubuntu-hirsute-kernel.git] / Documentation / devicetree / bindings / pci / designware-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
index 9f4faa8e8d005ee1810f0dc4272d63f4af3e17e6..64f2fff121288cb0560a6186b6cddce6ecc33978 100644 (file)
--- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
@@ -15,14 +15,33 @@ Required properties:
        to define the mapping of the PCIe interface to interrupt
        numbers.
 - num-lanes: number of lanes to use
-- clocks: Must contain an entry for each entry in clock-names.
-       See ../clocks/clock-bindings.txt for details.
-- clock-names: Must include the following entries:
-       - "pcie"
-       - "pcie_bus"
 
 Optional properties:
+- num-lanes: number of lanes to use (this property should be specified unless
+  the link is brought already up in BIOS)
 - reset-gpio: gpio pin number of power good signal
 - bus-range: PCI bus numbers covered (it is recommended for new devicetrees to
   specify this property, to keep backwards compatibility a range of 0x00-0xff
   is assumed if not present)
+- clocks: Must contain an entry for each entry in clock-names.
+       See ../clocks/clock-bindings.txt for details.
+- clock-names: Must include the following entries:
+       - "pcie"
+       - "pcie_bus"
+
+Example configuration:
+
+       pcie: pcie@0xdffff000 {
+               compatible = "snps,dw-pcie";
+               reg = <0xdffff000 0x1000>, /* Controller registers */
+                     <0xd0000000 0x2000>; /* PCI config space */
+               reg-names = "ctrlreg", "config";
+               #address-cells = <3>;
+               #size-cells = <2>;
+               device_type = "pci";
+               ranges = <0x81000000 0 0x00000000 0xde000000 0 0x00010000
+                         0x82000000 0 0xd0400000 0xd0400000 0 0x0d000000>;
+               interrupts = <25>, <24>;
+               #interrupt-cells = <1>;
+               num-lanes = <1>;
+       };