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From:   Aswath Govindraju <a-govindraju@ti.com>
CC:     Vignesh Raghavendra <vigneshr@ti.com>,
        Kishon Vijay Abraham I <kishon@ti.com>,
        Aswath Govindraju <a-govindraju@ti.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzk+dt@kernel.org>,
        Felipe Balbi <balbi@kernel.org>, <linux-usb@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v3 1/2] dt-bindings: usb: Add documentation for AM62 USB Wrapper module
Date:   Wed, 6 Apr 2022 19:22:10 +0530
Message-ID: <20220406135214.6989-2-a-govindraju@ti.com>
In-Reply-To: <20220406135214.6989-1-a-govindraju@ti.com>
References: <20220406135214.6989-1-a-govindraju@ti.com>
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Add bindings for the TI's AM62 wrapper module for the Synopsys USBSS-DRD
controller.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
---

changes since v2:
- Removed the implementation of detecting the role from the wrapper
  driver and moved the implementation to using linux,extcon-usb-gpio
  driver for role detection.
- Updated the binding documentation and example to reflect the same.

 .../devicetree/bindings/usb/ti,am62-usb.yaml  | 115 ++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/ti,am62-usb.yaml

diff --git a/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml b/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml
new file mode 100644
index 000000000000..59b5ccea5671
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml
@@ -0,0 +1,115 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/ti,am62-usb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI's AM62 wrapper module for the Synopsys USBSS-DRD controller
+
+maintainers:
+  - Aswath Govindraju <a-govindraju@ti.com>
+
+properties:
+  compatible:
+    const: ti,am62-usb
+
+  reg:
+    maxItems: 1
+
+  ranges: true
+
+  power-domains:
+    description:
+      PM domain provider node and an args specifier containing
+      the USB ISO device id value. See,
+      Documentation/devicetree/bindings/soc/ti/sci-pm-domain.yaml
+    maxItems: 1
+
+  clocks:
+    description: Clock phandle to usb2_refclk
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: ref
+
+  interrupts:
+    description:
+      interrupt line to be used for detecting changes in VBUS
+    maxItems: 1
+
+  ti,vbus-divider:
+    description:
+      Should be present if USB VBUS line is connected to the
+      VBUS pin of the SoC via a 1/3 voltage divider.
+    type: boolean
+
+  ti,syscon-phy-pll-refclk:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: Phandle to the SYSCON entry
+          - description: USB phy control register offset within SYSCON
+    description:
+      Specifier for conveying frequency of ref clock input, for the
+      operation of USB2PHY.
+
+  '#address-cells':
+    const: 2
+
+  '#size-cells':
+    const: 2
+
+patternProperties:
+  "^usb@[0-9a-f]+$":
+    $ref: snps,dwc3.yaml#
+    description: Required child node
+
+required:
+  - compatible
+  - reg
+  - power-domains
+  - clocks
+  - clock-names
+  - interrupts
+  - ti,syscon-phy-pll-refclk
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    extcon_usb1: extcon-usb1 {
+      id-gpios = <&main_gpio1 51 GPIO_ACTIVE_HIGH>;
+    };
+
+    bus {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      usbss1: usb@f910000 {
+        compatible = "ti,am62-usb";
+        reg = <0x00 0x0f910000 0x00 0x800>;
+        interrupts = <GIC_SPI 234 IRQ_TYPE_LEVEL_HIGH>; /* MISC IRQ */
+        clocks = <&k3_clks 162 3>;
+        clock-names = "ref";
+        ti,syscon-phy-pll-refclk = <&wkup_conf 0x4018>;
+        power-domains = <&k3_pds 179 TI_SCI_PD_EXCLUSIVE>;
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        usb@31100000 {
+          compatible = "snps,dwc3";
+          reg =<0x00 0x31100000 0x00 0x50000>;
+          interrupts = <GIC_SPI 226 IRQ_TYPE_LEVEL_HIGH>, /* irq.0 */
+                       <GIC_SPI 226 IRQ_TYPE_LEVEL_HIGH>; /* irq.0 */
+          interrupt-names = "host", "peripheral";
+          maximum-speed = "high-speed";
+          extcon = <&extcon_usb1>;
+          dr_mode = "otg";
+        };
+      };
+    };
-- 
2.17.1