dt-bindings: usb: add TUSB73x0 PCIe

Add device tree bindings for TI's TUSB73x0 PCIe-to-USB 3.0 xHCI
host controller. The controller supports software configuration
through PCIe registers, such as controlling the PWRONx polarity
via the USB control register (E0h).

Datasheet: https://www.ti.com/lit/ds/symlink/tusb7320.pdf
Signed-off-by: Parth Pancholi <parth.pancholi@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241029072444.8827-2-francesco@dolcini.it
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/usb/ti,tusb73x0-pci.yaml b/Documentation/devicetree/bindings/usb/ti,tusb73x0-pci.yaml
new file mode 100644 (file)
index 0000000..ddda734
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ti,tusb73x0-pci.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/ti,tusb73x0-pci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TUSB73x0 USB 3.0 xHCI Host Controller (PCIe)
+
+maintainers:
+  - Francesco Dolcini <francesco.dolcini@toradex.com>
+
+description:
+  TUSB73x0 USB 3.0 xHCI Host Controller via PCIe x1 Gen2 interface.
+  The TUSB7320 supports up to two downstream ports, the TUSB7340 supports up
+  to four downstream ports, both variants share the same PCI device ID.
+
+properties:
+  compatible:
+    const: pci104c,8241
+
+  reg:
+    maxItems: 1
+
+  ti,pwron-active-high:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Configure the polarity of the PWRONx# signals. When this is present, the
+      PWRONx# pins are active high and their internal pull-down resistors are
+      disabled. When this is absent, the PWRONx# pins are active low (default)
+      and their internal pull-down resistors are enabled.
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: usb-xhci.yaml
+
+additionalProperties: false
+
+examples:
+  - |
+    pcie@0 {
+        reg = <0x0 0x1000>;
+        ranges = <0x02000000 0x0 0x100000 0x10000000 0x0 0x0>;
+        #address-cells = <3>;
+        #size-cells = <2>;
+        device_type = "pci";
+
+        usb@0 {
+              compatible = "pci104c,8241";
+              reg = <0x0 0x0 0x0 0x0 0x0>;
+              ti,pwron-active-high;
+        };
+    };