[PATCH 1/3] dt-bindings: phy: nuvoton,ma35d1-usb2-phy: extend for dual-port OTG support

[Joey Lu]

The MA35D1 has two USB PHY ports managed by the same hardware block:

  - PHY0 (index 0): OTG port shared between the DWC2 gadget controller
    and EHCI0/OHCI0 host controllers.  A hardware mux follows the USB
    ID pin automatically.

  - PHY1 (index 1): dedicated host-only port for EHCI1/OHCI1.

Extend the existing binding to cover both ports:

  - The PHY node is now a child of the system-management syscon node
    with a reg property.  The nuvoton,sys phandle and clocks
    properties are removed; the driver derives the regmap from its
    parent, and clock gating is owned by each individual USB controller.

  - #phy-cells changes from 0 to 1: the cell selects the PHY port.

  - Two optional board-tuning properties are added: nuvoton,rcalcode
    for per-port resistor trim and nuvoton,oc-active-high for
    over-current polarity.

Signed-off-by: Joey Lu <a0987203069 at gmail.com>
---
 .../bindings/phy/nuvoton,ma35d1-usb2-phy.yaml | 62 ++++++++++++++-----
 1 file changed, 48 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/nuvoton,ma35d1-usb2-phy.yaml b/Documentation/devicetree/bindings/phy/nuvoton,ma35d1-usb2-phy.yaml
index fff858c909a0..dde045aff44e 100644
--- a/Documentation/devicetree/bindings/phy/nuvoton,ma35d1-usb2-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/nuvoton,ma35d1-usb2-phy.yaml
@@ -8,38 +8,72 @@ title: Nuvoton MA35D1 USB2 phy
 
 maintainers:
   - Hui-Ping Chen <hpchen0nvt at gmail.com>
+  - Joey Lu <yclu4 at nuvoton.com>
+
+description:
+  USB 2.0 PHY for the Nuvoton MA35D1 SoC.  The PHY node is a child of the
+  system-management syscon node and covers both PHY ports.
+
+  PHY0 (index 0) is the OTG port whose signals are routed to either the DWC2
+  gadget controller or the EHCI0/OHCI0 host controller by a hardware mux that
+  follows the USB ID pin automatically.
+
+  PHY1 (index 1) is a dedicated host-only port used by EHCI1/OHCI1.
 
 properties:
   compatible:
     enum:
       - nuvoton,ma35d1-usb2-phy
 
+  reg:
+    maxItems: 1
+
   "#phy-cells":
-    const: 0
+    const: 1
+    description:
+      The single cell selects the PHY port. 0 selects the OTG port (USB0,
+      shared with DWC2 gadget controller) and 1 selects the host-only port
+      (USB1).
 
-  clocks:
-    maxItems: 1
+  nuvoton,rcalcode:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+    items:
+      minimum: 0
+      maximum: 15
+    description:
+      Resistor calibration trim codes for PHY0 and, optionally, PHY1.
+      Each value is written to the RCALCODE field in USBPMISCR for the
+      corresponding PHY. The 4-bit value adjusts the PHY's internal
+      termination resistance. When absent the hardware reset default is used.
 
-  nuvoton,sys:
-    $ref: /schemas/types.yaml#/definitions/phandle
+  nuvoton,oc-active-high:
+    type: boolean
     description:
-      phandle to syscon for checking the PHY clock status.
+      When present, the over-current detect input from the VBUS power switch
+      is treated as active-high. The default (property absent) is active-low.
+      This setting is shared by both USB host ports.
 
 required:
   - compatible
+  - reg
   - "#phy-cells"
-  - clocks
-  - nuvoton,sys
 
 additionalProperties: false
 
 examples:
   - |
-    #include <dt-bindings/clock/nuvoton,ma35d1-clk.h>
+    system-management at 40460000 {
+        compatible = "nuvoton,ma35d1-reset", "syscon", "simple-mfd";
+        reg = <0x0 0x40460000 0x0 0x200>;
+        #reset-cells = <1>;
+        #address-cells = <1>;
+        #size-cells = <1>;
 
-    usb_phy: usb-phy {
-        compatible = "nuvoton,ma35d1-usb2-phy";
-        clocks = <&clk USBD_GATE>;
-        nuvoton,sys = <&sys>;
-        #phy-cells = <0>;
+        usb-phy at 60 {
+            compatible = "nuvoton,ma35d1-usb2-phy";
+            reg = <0x60 0x14>;
+            #phy-cells = <1>;
+        };
     };
-- 
2.43.0