[PATCH 12/24] dt-bindings: PCI: Add ZTE ZX279128S host controller

[Navid Ghahremani]

Describe both DesignWare hosts, the two control syscons and the shared
Wi-Fi reset lines. The shared-resource model remains an RFC question.

Assisted-by: LLM
Signed-off-by: Navid Ghahremani <ghahramani.navid at gmail.com>
---
 .../bindings/pci/zte,zx279128s-pcie.yaml      | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/zte,zx279128s-pcie.yaml

diff --git a/Documentation/devicetree/bindings/pci/zte,zx279128s-pcie.yaml b/Documentation/devicetree/bindings/pci/zte,zx279128s-pcie.yaml
new file mode 100644
index 0000000000..57a4e96610
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/zte,zx279128s-pcie.yaml
@@ -0,0 +1,97 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/zte,zx279128s-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ZTE zx279128s PCIe host controller
+
+maintainers:
+  - Navid Ghahremani <ghahramani.navid at gmail.com>
+
+description:
+  The ZTE zx279128s has two PCIe host controllers based on the Synopsys
+  DesignWare PCIe IP, each with one lane. Their clocks, resets and PHYs are
+  controlled through the SoC's Top CRM blocks.
+
+allOf:
+  - $ref: /schemas/pci/snps,dw-pcie.yaml#
+
+properties:
+  compatible:
+    const: zte,zx279128s-pcie
+
+  reg:
+    items:
+      - description: Data Bus Interface (DBI) registers
+      - description: Controller wrapper registers
+      - description: PCIe configuration space region
+
+  reg-names:
+    items:
+      - const: dbi
+      - const: ctrl
+      - const: config
+
+  interrupts:
+    maxItems: 1
+
+  zte,crm:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: The two Top CRM syscons that hold the clock, reset and PHY
+      controls of this controller.
+    items:
+      - items:
+          - description: phandle to Top CRM 1
+      - items:
+          - description: phandle to Top CRM 2
+
+  reset-gpios:
+    maxItems: 1
+    description: Board reset line. A device connected to both controllers
+      (the MT7915 Wi-Fi chip of the ZTE ZXHN H3600) has its lines listed in
+      both nodes; the first controller to start resets and releases it.
+
+  enable-gpios:
+    maxItems: 1
+    description: Second board line that is driven together with reset-gpios.
+
+required:
+  - reg
+  - reg-names
+  - interrupts
+  - '#interrupt-cells'
+  - interrupt-map
+  - interrupt-map-mask
+  - zte,crm
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    pcie at f000000 {
+        compatible = "zte,zx279128s-pcie";
+        reg = <0x0f000000 0x4000>,
+              <0x09500000 0x1000>,
+              <0x1c000000 0x200000>;
+        reg-names = "dbi", "ctrl", "config";
+        #address-cells = <3>;
+        #size-cells = <2>;
+        device_type = "pci";
+        bus-range = <0x00 0xff>;
+        ranges = <0x82000000 0 0x10000000 0x10000000 0 0x08000000>;
+        interrupts = <GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>;
+        #interrupt-cells = <1>;
+        interrupt-map-mask = <0 0 0 7>;
+        interrupt-map = <0 0 0 1 &gic GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>,
+                        <0 0 0 2 &gic GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>,
+                        <0 0 0 3 &gic GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>,
+                        <0 0 0 4 &gic GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>;
+        linux,pci-domain = <0>;
+        zte,crm = <&topcrm>, <&crm2>;
+        reset-gpios = <&gpio3 5 GPIO_ACTIVE_LOW>;
+        enable-gpios = <&gpio3 7 GPIO_ACTIVE_HIGH>;
+    };
-- 
2.55.0