This patch add some required and optional properties for Rockchip
PCIe controller. Also we add a example for how to use it.
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/pci/rockchip-pcie.txt | 93 ++++++++++++++++++++++
1 file changed, 93 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/rockchip-pcie.txt
diff --git a/Documentation/devicetree/bindings/pci/rockchip-pcie.txt b/Documentation/devicetree/bindings/pci/rockchip-pcie.txt
new file mode 100644
index 0000000..69a0804
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/rockchip-pcie.txt
@@ -0,0 +1,93 @@
+* Rockchip AXI PCIe Root Port Bridge DT description
+
+Required properties:
+- #address-cells: Address representation for root ports, set to <3>
+- #size-cells: Size representation for root ports, set to <2>
+- #interrupt-cells: specifies the number of cells needed to encode an
+ interrupt source. The value must be 1.
+- compatible: Should contain "rockchip,rk3399-pcie"
+- reg: Two register ranges as listed in the reg-names property
+- reg-names: The first entry must be "axi-base" for the core registers
+ The second entry must be "apb-base" for the client pcie registers
+- 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:
+ - "aclk_pcie"
+ - "aclk_perf_pcie"
+ - "hclk_pcie"
+ - "clk_pciephy_ref"
+- interrupts: Three interrupt entries must be specified.
+- interrupt-names: Must include the following names
+ - "pcie-sys"
+ - "pcie-legacy"
+ - "pcie-client"
+- resets: Must contain five entries for each entry in reset-names.
+ See ../reset/reset.txt for details.
+- reset-names: Must include the following names
+ - "phy-rst"
+ - "core-rst"
+ - "mgmt-rst"
+ - "mgmt-sticky-rst"
+ - "pipe-rst"
+- rockchip,grf: phandle to the syscon managing the "general register files"
+- pcie-conf: offset of pcie client block for configuration
+- pcie-status: offset of pcie client block for status
+- pcie-laneoff: offset of pcie client block for lane
+- msi-parent: Link to the hardware entity that serves as the Message
+- pinctrl-names : The pin control state names
+- pinctrl-0: The "default" pinctrl state
+- interrupt-map-mask and interrupt-map: standard PCI properties
+- interrupt-controller: identifies the node as an interrupt controller
+
+Optional Property:
+- ep-gpios: contain the entry for pre-reset gpio
+- num-lanes: number of lanes to use
+- assigned-clocks, assigned-clock-parents and assigned-clock-rates: standard
+ clock bindings. See ../clock/clock-bindings.txt
+
+Example:
+
+pci_express: axi-pcie@f8000000 {
+ #address-cells = <3>;
+ #size-cells = <2>;
+ compatible = "rockchip,rk3399-pcie";
+ clocks = <&cru ACLK_PCIE>, <&cru ACLK_PERF_PCIE>,
+ <&cru PCLK_PCIE>, <&cru SCLK_PCIEPHY_REF>;
+ clock-names = "aclk_pcie", "aclk_perf_pcie",
+ "hclk_pcie", "clk_pciephy_ref";
+ bus-range = <0x0 0x1>;
+ interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 51 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names: "pcie-sys", "pcie-legacy", "pcie-client";
+ assigned-clocks = <&cru SCLK_PCIEPHY_REF>;
+ assigned-clock-parents = <&cru SCLK_PCIEPHY_REF100M>;
+ assigned-clock-rates = <100000000>;
+ ep-gpios = <&gpio3 13 GPIO_ACTIVE_HIGH>;
+ ranges = < 0x82000000 0 0xfa000000 0x0 0xfa000000 0 0x600000
+ 0x81000000 0 0xfa600000 0x0 0xfa600000 0 0x100000 >;
+ num-lanes = <4>;
+ reg = < 0x0 0xf8000000 0x0 0x2000000 >, < 0x0 0xfd000000 0x0 0x1000000 >;
+ reg-name = "axi-base", "apb-base";
+ resets = <&cru SRST_PCIEPHY>, <&cru SRST_PCIE_CORE>, <&cru SRST_PCIE_MGMT>,
+ <&cru SRST_PCIE_MGMT_STICKY>, <&cru SRST_PCIE_PIPE>;
+ reset-names = "phy-rst", "core-rst", "mgmt-rst", "mgmt-sticky-rst", "pipe-rst";
+ rockchip,grf = <&grf>;
+ pcie-conf = <0xe220>;
+ pcie-status = <0xe2a4>;
+ pcie-laneoff = <0xe214>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pcie_clkreq>;
+ msi-parent = <&its>;
+ #interrupt-cells = <1>;
+ interrupt-map-mask = <0 0 0 7>;
+ interrupt-map = <0 0 0 1 &pcie_0 1>,
+ <0 0 0 2 &pcie_0 2>,
+ <0 0 0 3 &pcie_0 3>,
+ <0 0 0 4 &pcie_0 4>;
+ pcie_0: interrupt-controller {
+ interrupt-controller;
+ #address-cells = <0>;
+ #interrupt-cells = <1>;
+ };
+
+};
--
2.3.7
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