This commit adds device tree bindings documentation for PCIEE controller
of MT7621 SoC.
Signed-off-by: Sergio Paracuellos <sergio.paracuel...@gmail.com>
---
drivers/staging/mt7621-pci/mediatek,mt7621-pci.txt | 97 ++++++++++++++++++++++
1 file changed, 97 insertions(+)
create mode 100644 drivers/staging/mt7621-pci/mediatek,mt7621-pci.txt
diff --git a/drivers/staging/mt7621-pci/mediatek,mt7621-pci.txt
b/drivers/staging/mt7621-pci/mediatek,mt7621-pci.txt
new file mode 100644
index 0000000..b9d16bc
--- /dev/null
+++ b/drivers/staging/mt7621-pci/mediatek,mt7621-pci.txt
@@ -0,0 +1,97 @@
+MediaTek MT7621 PCIe controller
+
+Required properties:
+- compatible: "mediatek,mt7621-pci"
+- device_type: Must be "pci"
+- reg: Base addresses and lengths of the PCIe subsys and root ports.
+- bus-range: Range of bus numbers associated with this controller.
+- #address-cells: Address representation for root ports (must be 3)
+- pinctrl-names : The pin control state names.
+- pinctrl-0: The "default" pinctrl state.
+- #size-cells: Size representation for root ports (must be 2)
+- ranges: Ranges for the PCI memory and I/O regions.
+- #interrupt-cells: Must be 1
+- interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties.
+ Please refer to the standard PCI bus binding document for a more detailed
+ explanation.
+- status: either "disabled" or "okay".
+- resets: Must contain an entry for each entry in reset-names.
+ See ../reset/reset.txt for details.
+- reset-names: Must be "pcie0", "pcie1", "pcieN"... based on the number of
+ root ports.
+- clocks: Must contain an entry for each entry in clock-names.
+ See ../clocks/clock-bindings.txt for details.
+- clock-names: Must be "pcie0", "pcie1", "pcieN"... based on the number of
+ root ports.
+
+In addition, the device tree node must have sub-nodes describing each PCIe port
+interface, having the following mandatory properties:
+
+Required properties:
+- reg: Only the first four bytes are used to refer to the correct bus number
+ and device number.
+- #address-cells: Must be 3
+- #size-cells: Must be 2
+- ranges: Sub-ranges distributed from the PCIe controller node. An empty
+ property is sufficient.
+- bus-range: Range of bus numbers associated with this port.
+
+Example for MT7621:
+
+ pcie: pcie@1e140000 {
+ compatible = "mediatek,mt7621-pci";
+ reg = <0x1e140000 0x100
+ 0x1e142000 0x100>;
+
+ #address-cells = <3>;
+ #size-cells = <2>;
+
+ pinctrl-names = "default";
+ pinctrl-0 = <&pcie_pins>;
+
+ device_type = "pci";
+
+ bus-range = <0 255>;
+ ranges = <
+ 0x02000000 0 0x00000000 0x60000000 0 0x10000000 /* pci
memory */
+ 0x01000000 0 0x00000000 0x1e160000 0 0x00010000 /* io
space */
+ >;
+
+ #interrupt-cells = <1>;
+ interrupt-map-mask = <0xF0000 0 0 1>;
+ interrupt-map = <0x10000 0 0 1 &gic GIC_SHARED 4
IRQ_TYPE_LEVEL_HIGH>,
+ <0x20000 0 0 1 &gic GIC_SHARED 24
IRQ_TYPE_LEVEL_HIGH>,
+ <0x30000 0 0 1 &gic GIC_SHARED 25
IRQ_TYPE_LEVEL_HIGH>;
+
+ status = "disabled";
+
+ resets = <&rstctrl 24 &rstctrl 25 &rstctrl 26>;
+ reset-names = "pcie0", "pcie1", "pcie2";
+ clocks = <&clkctrl 24 &clkctrl 25 &clkctrl 26>;
+ clock-names = "pcie0", "pcie1", "pcie2";
+
+ pcie@0,0 {
+ reg = <0x0000 0 0 0 0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+ bus-range = <0x00 0xff>;
+ };
+
+ pcie@1,0 {
+ reg = <0x0800 0 0 0 0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+ bus-range = <0x00 0xff>;
+ };
+
+ pcie@2,0 {
+ reg = <0x1000 0 0 0 0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+ bus-range = <0x00 0xff>;
+ };
+ };
+
--
2.7.4
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