linux-kernel - [PATCH v3 1/2] dt-bindings: usb: add TUSB73x0 PCIe

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Message-Id: <20241018105505.28005-2-francesco@dolcini.it>
Date: Fri, 18 Oct 2024 12:55:04 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Francesco Dolcini <francesco.dolcini@...adex.com>
Cc: Parth Pancholi <parth.pancholi@...adex.com>,
	linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] dt-bindings: usb: add TUSB73x0 PCIe

From: Parth Pancholi <parth.pancholi@...adex.com>

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).

Similar generic PCIe-based bindings can be found as qcom,ath11k-pci.yaml
as an example.

Datasheet: https://www.ti.com/lit/ds/symlink/tusb7320.pdf
Signed-off-by: Parth Pancholi <parth.pancholi@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
v3: use lowercase hex in compatible
v2: rename property to ti,tusb7320-pwron-active-high and change type to flag
---
 .../bindings/usb/ti,tusb73x0-pci.yaml         | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/ti,tusb73x0-pci.yaml

diff --git a/Documentation/devicetree/bindings/usb/ti,tusb73x0-pci.yaml b/Documentation/devicetree/bindings/usb/ti,tusb73x0-pci.yaml
new file mode 100644
index 000000000000..7083e24d279c
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ti,tusb73x0-pci.yaml
@@ -0,0 +1,60 @@
+# 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@...adex.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.
+
+properties:
+  compatible:
+    const: pci104c,8241
+
+  reg:
+    maxItems: 1
+
+  ti,tusb7320-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
+
+additionalProperties: false
+
+examples:
+  - |
+    pcie {
+        #address-cells = <3>;
+        #size-cells = <2>;
+
+        pcie@0 {
+            device_type = "pci";
+            reg = <0x0 0x0 0x0 0x0 0x0>;
+            bus-range = <0x01 0xff>;
+
+            #address-cells = <3>;
+            #size-cells = <2>;
+            ranges;
+
+            usb@0 {
+                  compatible = "pci104c,8241";
+                  reg = <0x10000 0x0 0x0 0x0 0x0>;
+
+                  ti,tusb7320-pwron-active-high;
+            };
+        };
+    };
-- 
2.39.5