[PATCH 1/2] dt-bindings: pci: Add Sophgo SG2044 PCIe host

Inochi Amaoto
2025-02-21T01:38:20Z

The pcie controller on the SG2044 is designware based with
custom app registers.

Add binding document for SG2044 PCIe host controller.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
---
.../bindings/pci/sophgo,sg2044-pcie.yaml | 125 ++++++++++++++++++
1 file changed, 125 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/sophgo,sg2044-pcie.yaml

diff --git a/Documentation/devicetree/bindings/pci/sophgo,sg2044-pcie.yaml b/Documentation/devicetree/bindings/pci/sophgo,sg2044-pcie.yaml
new file mode 100644
index 000000000000..040dabe905e0
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/sophgo,sg2044-pcie.yaml
@@ -0,0 +1,125 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/sophgo,sg2044-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: DesignWare based PCIe Root Complex controller on Sophgo SoCs
+
+maintainers:
+ - Inochi Amaoto <inochiama@gmail.com>
+
+description: |+
+ SG2044 SoC PCIe Root Complex controller is based on the Synopsys DesignWare
+ PCIe IP and thus inherits all the common properties defined in
+ snps,dw-pcie.yaml.
+
+allOf:
+ - $ref: /schemas/pci/pci-host-bridge.yaml#
+ - $ref: /schemas/pci/snps,dw-pcie.yaml#
+
+properties:
+ compatible:
+ const: sophgo,sg2044-pcie
+
+ reg:
+ items:
+ - description: Data Bus Interface (DBI) registers
+ - description: iATU registers
+ - description: Config registers
+ - description: Sophgo designed configuration registers
+
+ reg-names:
+ items:
+ - const: dbi
+ - const: atu
+ - const: config
+ - const: app
+
+ clocks:
+ items:
+ - description: core clk
+
+ clock-names:
+ items:
+ - const: core
+
+ dma-coherent: true
+
+ interrupt-controller:
+ description: Interrupt controller node for handling legacy PCI interrupts.
+ type: object
+
+ properties:
+ "#address-cells":
+ const: 0
+
+ "#interrupt-cells":
+ const: 1
+
+ interrupt-controller: true
+
+ interrupts:
+ items:
+ - description: combined legacy interrupt
+
+ required:
+ - "#address-cells"
+ - "#interrupt-cells"
+ - interrupt-controller
+ - interrupts
+
+ additionalProperties: false
+
+ msi-parent: true
+
+ ranges:
+ maxItems: 5
+
+required:
+ - compatible
+ - reg
+ - clocks
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ pcie@6c00400000 {
+ compatible = "sophgo,sg2044-pcie";
+ reg = <0x6c 0x00400000 0x0 0x00001000>,
+ <0x6c 0x00700000 0x0 0x00004000>,
+ <0x40 0x00000000 0x0 0x00001000>,
+ <0x6c 0x00780c00 0x0 0x00000400>;
+ reg-names = "dbi", "atu", "config", "app";
+ #address-cells = <3>;
+ #size-cells = <2>;
+ bus-range = <0x00 0xff>;
+ clocks = <&clk 0>;
+ clock-names = "core";
+ device_type = "pci";
+ dma-coherent;
+ linux,pci-domain = <0>;
+ msi-parent = <&msi>;
+ ranges = <0x01000000 0x0 0x00000000 0x40 0x10000000 0x0 0x00200000>,
+ <0x42000000 0x0 0x00000000 0x0 0x00000000 0x0 0x04000000>,
+ <0x02000000 0x0 0x04000000 0x0 0x04000000 0x0 0x04000000>,
+ <0x43000000 0x42 0x00000000 0x42 0x00000000 0x2 0x00000000>,
+ <0x03000000 0x41 0x00000000 0x41 0x00000000 0x1 0x00000000>;
+
+ interrupt-controller {
+ #address-cells = <0>;
+ #interrupt-cells = <1>;
+ interrupt-controller;
+ interrupt-parent = <&intc>;
+ interrupts = <64 IRQ_TYPE_LEVEL_HIGH>;
+ };
+ };
+ };
+...
--
2.48.1