summaryrefslogtreecommitdiff
path: root/Documentation
diff options
context:
space:
mode:
authorBjorn Helgaas <bhelgaas@google.com>2019-01-03 00:31:15 +0300
committerBjorn Helgaas <bhelgaas@google.com>2019-01-03 00:31:15 +0300
commitcdf4f4dc118bafd97d0148d53730e396ece11afa (patch)
tree91f12d628f1ec43fee71da3269b8fe0ad7d4b4e8 /Documentation
parentc266b026ae7a51f876eb74e15ff63f834fe35976 (diff)
parent7e6d5cd88a6f4961ed2968799ef98528c13ac5f8 (diff)
downloadlinux-cdf4f4dc118bafd97d0148d53730e396ece11afa.tar.xz
Merge branch 'remotes/lorenzo/pci/uniphier'
- Add UniPhier PCIe controller driver and DT bindings (Kunihiko Hayashi) * remotes/lorenzo/pci/uniphier: PCI: uniphier: Add UniPhier PCIe host controller support dt-bindings: PCI: Add UniPhier PCIe host controller description # Conflicts: # drivers/pci/controller/dwc/Kconfig # drivers/pci/controller/dwc/Makefile
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/pci/uniphier-pcie.txt81
1 files changed, 81 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pci/uniphier-pcie.txt b/Documentation/devicetree/bindings/pci/uniphier-pcie.txt
new file mode 100644
index 000000000000..1fa2c5906d4d
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/uniphier-pcie.txt
@@ -0,0 +1,81 @@
+Socionext UniPhier PCIe host controller bindings
+
+This describes the devicetree bindings for PCIe host controller implemented
+on Socionext UniPhier SoCs.
+
+UniPhier PCIe host controller is based on the Synopsys DesignWare PCI core.
+It shares common functions with the PCIe DesignWare core driver and inherits
+common properties defined in
+Documentation/devicetree/bindings/pci/designware-pcie.txt.
+
+Required properties:
+- compatible: Should be "socionext,uniphier-pcie".
+- reg: Specifies offset and length of the register set for the device.
+ According to the reg-names, appropriate register sets are required.
+- reg-names: Must include the following entries:
+ "dbi" - controller configuration registers
+ "link" - SoC-specific glue layer registers
+ "config" - PCIe configuration space
+- clocks: A phandle to the clock gate for PCIe glue layer including
+ the host controller.
+- resets: A phandle to the reset line for PCIe glue layer including
+ the host controller.
+- interrupts: A list of interrupt specifiers. According to the
+ interrupt-names, appropriate interrupts are required.
+- interrupt-names: Must include the following entries:
+ "dma" - DMA interrupt
+ "msi" - MSI interrupt
+
+Optional properties:
+- phys: A phandle to generic PCIe PHY. According to the phy-names, appropriate
+ phys are required.
+- phy-names: Must be "pcie-phy".
+
+Required sub-node:
+- legacy-interrupt-controller: Specifies interrupt controller for legacy PCI
+ interrupts.
+
+Required properties for legacy-interrupt-controller:
+- interrupt-controller: identifies the node as an interrupt controller.
+- #interrupt-cells: specifies the number of cells needed to encode an
+ interrupt source. The value must be 1.
+- interrupt-parent: Phandle to the parent interrupt controller.
+- interrupts: An interrupt specifier for legacy interrupt.
+
+Example:
+
+ pcie: pcie@66000000 {
+ compatible = "socionext,uniphier-pcie", "snps,dw-pcie";
+ status = "disabled";
+ reg-names = "dbi", "link", "config";
+ reg = <0x66000000 0x1000>, <0x66010000 0x10000>,
+ <0x2fff0000 0x10000>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ clocks = <&sys_clk 24>;
+ resets = <&sys_rst 24>;
+ num-lanes = <1>;
+ num-viewport = <1>;
+ bus-range = <0x0 0xff>;
+ device_type = "pci";
+ ranges =
+ /* downstream I/O */
+ <0x81000000 0 0x00000000 0x2ffe0000 0 0x00010000
+ /* non-prefetchable memory */
+ 0x82000000 0 0x00000000 0x20000000 0 0x0ffe0000>;
+ #interrupt-cells = <1>;
+ interrupt-names = "dma", "msi";
+ interrupts = <0 224 4>, <0 225 4>;
+ interrupt-map-mask = <0 0 0 7>;
+ interrupt-map = <0 0 0 1 &pcie_intc 0>, /* INTA */
+ <0 0 0 2 &pcie_intc 1>, /* INTB */
+ <0 0 0 3 &pcie_intc 2>, /* INTC */
+ <0 0 0 4 &pcie_intc 3>; /* INTD */
+
+ pcie_intc: legacy-interrupt-controller {
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 226 4>;
+ };
+ };