On Thu, Mar 18, 2021 at 02:08:11PM +0800, Greentime Hu wrote: > Add PCIe host controller DT bindings of SiFive FU740. > > Signed-off-by: Greentime Hu <greentime.hu@xxxxxxxxxx> > --- > .../bindings/pci/sifive,fu740-pcie.yaml | 119 ++++++++++++++++++ > 1 file changed, 119 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml > > diff --git a/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml b/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml > new file mode 100644 > index 000000000000..c25a91b18cd7 > --- /dev/null > +++ b/Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml > @@ -0,0 +1,119 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/pci/sifive,fu740-pcie.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: SiFive fu740 PCIe host controller > + > +description: > + SiFive fu740 PCIe host controller is based on the Synopsys DesignWare > + PCI core. It shares common features with the PCIe DesignWare core and > + inherits common properties defined in > + Documentation/devicetree/bindings/pci/designware-pcie.txt. > + > +maintainers: > + - Paul Walmsley <paul.walmsley@xxxxxxxxxx> > + - Greentime Hu <greentime.hu@xxxxxxxxxx> > + > +allOf: > + - $ref: /schemas/pci/pci-bus.yaml# > + > +properties: > + compatible: > + const: sifive,fu740-pcie > + > + reg: > + maxItems: 4 What's the 4th item because there's only 3 names: > + > + reg-names: > + items: > + - const: dbi > + - const: config > + - const: mgmt > + > + device_type: > + const: pci Already in pci-bus.yaml > + > + dma-coherent: > + description: Indicates that the PCIe IP block can ensure the coherency > + > + bus-range: > + description: Range of bus numbers associated with this controller. Already in pci-bus.yaml > + > + num-lanes: true Need to define possible values if not all of 1,2,4,8,16. > + > + msi-parent: true > + > + interrupt-names: > + items: > + - const: msi > + - const: inta > + - const: intb > + - const: intc > + - const: intd > + > + resets: > + description: A phandle to the PCIe power up reset line > + > + pwren-gpios: > + description: Should specify the GPIO for controlling the PCI bus device power on maxItems: 1 > + > + perstn-gpios: > + description: Should specify the GPIO for controlling the PCI bus device reset The DWC binding and pci.txt already define 'reset-gpios' for this purpose. > + > +required: > + - compatible > + - reg > + - reg-names > + - device_type pci-bus.yaml already requires this. > + - dma-coherent > + - bus-range This generally doesn't need to be required unless the h/w can't support 0-0xff. > + - ranges pci-bus.yaml already requires this. > + - num-lanes > + - interrupts > + - interrupt-names > + - interrupt-parent > + - interrupt-map-mask > + - interrupt-map > + - clock-names > + - clocks > + - resets > + - pwren-gpios > + - perstn-gpios > + > +additionalProperties: false > + > +examples: > + - | > + pcie@e00000000 { > + #address-cells = <3>; > + #interrupt-cells = <1>; > + #size-cells = <2>; > + compatible = "sifive,fu740-pcie"; > + reg = <0xe 0x00000000 0x1 0x0 Humm, 4GB for DBI space? The DWC controller doesn't have that much space, and the kernel will map *all* of that. That's not an insignificant amount of memory just for page tables. > + 0xd 0xf0000000 0x0 0x10000000 > + 0x0 0x100d0000 0x0 0x1000>; <> around each reg entry. > + reg-names = "dbi", "config", "mgmt"; > + device_type = "pci"; > + dma-coherent; > + bus-range = <0x0 0xff>; > + ranges = <0x81000000 0x0 0x60080000 0x0 0x60080000 0x0 0x10000 /* I/O */ > + 0x82000000 0x0 0x60090000 0x0 0x60090000 0x0 0xff70000 /* mem */ > + 0x82000000 0x0 0x70000000 0x0 0x70000000 0x0 0x1000000 /* mem */ > + 0xc3000000 0x20 0x00000000 0x20 0x00000000 0x20 0x00000000>; /* mem prefetchable */ <> around each ranges entry. > + num-lanes = <0x8>; > + interrupts = <56 57 58 59 60 61 62 63 64>; And here. > + interrupt-names = "msi", "inta", "intb", "intc", "intd"; > + interrupt-parent = <&plic0>; > + interrupt-map-mask = <0x0 0x0 0x0 0x7>; > + interrupt-map = <0x0 0x0 0x0 0x1 &plic0 57>, > + <0x0 0x0 0x0 0x2 &plic0 58>, > + <0x0 0x0 0x0 0x3 &plic0 59>, > + <0x0 0x0 0x0 0x4 &plic0 60>; > + clock-names = "pcie_aux"; > + clocks = <&prci PRCI_CLK_PCIE_AUX>; > + resets = <&prci 4>; > + pwren-gpios = <&gpio 5 0>; > + perstn-gpios = <&gpio 8 0>; > + }; > -- > 2.30.2 >
