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staging: mt7621-pci: dt-bindings: add dt bindings for mt7621 pcie controller 

This commit adds pci device tree bindings for the Mt7621 pci controller.
This is a temporal file included in staging driver directory and will be
moved to its correct location when this driver gets out of staging.

Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergio Paracuellos 2018-10-26 18:48:06 +02:00 committed by Greg Kroah-Hartman
parent 98afdd565f
commit 5451e22618
1 changed files with 100 additions and 0 deletions
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drivers/staging/mt7621-pci/mediatek,mt7621-pci.txt Normal file
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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 /* host-pci bridge registers */
0x1e142000 0x100 /* pcie port 0 RC control registers */
0x1e143000 0x100 /* pcie port 1 RC control registers */
0x1e144000 0x100 /* pcie port 2 RC control registers */
0x1e000000 0x100>; /* sysctl */
#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>;
};
};