On Thu, Jul 28, 2022 at 05:34:22PM +0300, Serge Semin wrote: > Baikal-T1 SoC is equipped with DWC PCIe v4.60a Root Port controller, which > link can be trained to work on up to Gen.3 speed over up to x4 lanes. The > controller is supposed to be fed up with four clock sources: DBI > peripheral clock, AXI application Tx/Rx clocks and external PHY/core > reference clock generating the 100MHz signal. In addition to that the > platform provide a way to reset each part of the controller: > sticky/non-sticky bits, host controller core, PIPE interface, PCS/PHY and > Hot/Power reset signal. The Root Port controller is equipped with multiple > IRQ lines like MSI, system AER, PME, HP, Bandwidth change, Link > equalization request and eDMA ones. The registers space is accessed over > the DBI interface. There can be no more than four inbound or outbound iATU > windows configured. > > Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx> > > --- > > Changelog v2: > - Rename 'syscon' property to 'baikal,bt1-syscon'. > - Fix the 'compatible' property definition to being more specific about > what strings are supposed to be used. Due to that we had to add the > select property to evaluate the schema against the Baikal-T1 PCIe DT > nodes only. > --- > .../bindings/pci/baikal,bt1-pcie.yaml | 154 ++++++++++++++++++ > 1 file changed, 154 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml > > diff --git a/Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml b/Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml > new file mode 100644 > index 000000000000..23bd1d0aa5c5 > --- /dev/null > +++ b/Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml > @@ -0,0 +1,154 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/pci/baikal,bt1-pcie.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Baikal-T1 PCIe Root Port Controller > + > +maintainers: > + - Serge Semin <fancer.lancer@xxxxxxxxx> > + > +description: > + Embedded into Baikal-T1 SoC Root Complex controller. It's based on the > + DWC RC PCIe v4.60a IP-core, which is configured to have just a single Root > + Port function and is capable of establishing the link up to Gen.3 speed > + on x4 lanes. It doesn't have embedded clock and reset control module, so > + the proper interface initialization is supposed to be performed by software. > + > +select: > + properties: > + compatible: > + contains: > + const: baikal,bt1-pcie > + > + required: > + - compatible > + > +allOf: > + - $ref: /schemas/pci/snps,dw-pcie.yaml# > + > +properties: > + compatible: > + items: > + - const: baikal,bt1-pcie > + - const: snps,dw-pcie-4.60a > + - const: snps,dw-pcie Again, these fallbacks simply aren't useful. > + > + reg: > + description: > + DBI, DBI2 and at least 4KB outbound iATU-capable region. 'iATU-capable region' means config space? That's not very clear. > + maxItems: 3 > + > + reg-names: > + minItems: 3 > + maxItems: 3 > + items: > + enum: [ dbi, dbi2, config ] Define the order. Here, and the rest. > + > + interrupts: > + description: > + MSI, AER, PME, Hot-plug, Link Bandwidth Management, Link Equalization > + request and eight Read/Write eDMA IRQ lines are available. > + maxItems: 14 > + > + interrupt-names: > + minItems: 14 > + maxItems: 14 > + items: > + oneOf: > + - pattern: '^dma[0-7]$' > + - enum: [ msi, aer, pme, hp, bw_mg, l_eq ] > + > + clocks: > + description: > + DBI (attached to the APB bus), AXI-bus master and slave interfaces > + are fed up by the dedicated application clocks. A common reference > + clock signal is supposed to be attached to the corresponding Ref-pad > + of the SoC. It will be redistributed amongst the controller core > + sub-modules (pipe, core, aux, etc). > + minItems: 4 > + maxItems: 4 > + > + clock-names: > + minItems: 4 > + maxItems: 4 > + items: > + enum: [ dbi, mstr, slv, ref ] > + > + resets: > + description: > + A comprehensive controller reset logic is supposed to be implemented > + by software, so almost all the possible application and core reset > + signals are exposed via the system CCU module. > + minItems: 9 > + maxItems: 9 > + > + reset-names: > + minItems: 9 > + maxItems: 9 > + items: > + enum: [ mstr, slv, pwr, hot, phy, core, pipe, sticky, non-sticky ] > + > + baikal,bt1-syscon: > + $ref: /schemas/types.yaml#/definitions/phandle > + description: > + Phandle to the Baikal-T1 System Controller DT node. It's required to > + access some additional PM, Reset-related and LTSSM signals. > + > + num-lanes: > + maximum: 4 > + > + max-link-speed: > + maximum: 3 > + > + num-ob-windows: > + const: 4 > + > + num-ib-windows: > + const: 4 These are deprecated. Don't add them for a new binding. > + > +required: > + - compatible > + - reg > + - reg-names > + - interrupts > + - interrupt-names > + > +unevaluatedProperties: false > + > +examples: > + - | > + pcie@1f052000 { > + compatible = "baikal,bt1-pcie", "snps,dw-pcie-4.60a", "snps,dw-pcie"; > + device_type = "pci"; > + reg = <0x1f052000 0x1000>, <0x1f053000 0x1000>, <0x1bdbf000 0x1000>; > + reg-names = "dbi", "dbi2", "config"; > + #address-cells = <3>; > + #size-cells = <2>; > + ranges = <0x81000000 0 0x00000000 0x1bdb0000 0 0x00008000>, > + <0x82000000 0 0x20000000 0x08000000 0 0x13db0000>; > + bus-range = <0x0 0xff>; > + > + interrupts = <0 80 4>, <0 81 4>, <0 82 4>, <0 83 4>, > + <0 84 4>, <0 85 4>, <0 86 4>, <0 87 4>, > + <0 88 4>, <0 89 4>, <0 90 4>, <0 91 4>, > + <0 92 4>, <0 93 4>; > + interrupt-names = "dma0", "dma1", "dma2", "dma3", "dma4", "dma5", "dma6", > + "dma7", "msi", "aer", "pme", "hp", "bw_mg", "l_eq"; > + > + clocks = <&ccu_sys 1>, <&ccu_axi 6>, <&ccu_axi 7>, <&clk_pcie>; > + clock-names = "dbi", "mstr", "slv", "ref"; > + > + resets = <&ccu_axi 6>, <&ccu_axi 7>, <&ccu_sys 7>, <&ccu_sys 10>, > + <&ccu_sys 4>, <&ccu_sys 6>, <&ccu_sys 5>, <&ccu_sys 8>, > + <&ccu_sys 9>; > + reset-names = "mstr", "slv", "pwr", "hot", "phy", "core", "pipe", > + "sticky", "non-sticky"; > + > + reset-gpios = <&port0 0 1>; > + > + num-lanes = <4>; > + max-link-speed = <3>; > + }; > +... > -- > 2.35.1 > >
