[PATCH v2 1/1] dt-bindings: usb: Fix EIC7700 USB reset's issue

[caohang@eswincomputing.com]

From: Hang Cao <caohang@eswincomputing.com>

The EIC7700 USB requires a USB PHY reset operation; otherwise, the USB
will not work. The reason why the USB driver that was applied can work
properly is that the USB PHY has already been reset in ESWIN's U-Boot.

However, the proper functioning of the USB driver should not be dependent
on the bootloader. Therefore, it is necessary to incorporate the USB PHY
reset signal into the DT bindings.

This patch does not introduce any backward incompatibility since the dts
is not upstream yet. As array of reset operations are used in the driver,
no modifications to the USB controller driver are needed.

Fixes: c640a4239db5 ("dt-bindings: usb: Add ESWIN EIC7700 USB controller")
Signed-off-by: Hang Cao <caohang@eswincomputing.com>
---
 .../devicetree/bindings/usb/eswin,eic7700-usb.yaml         | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/eswin,eic7700-usb.yaml b/Documentation/devicetree/bindings/usb/eswin,eic7700-usb.yaml
index 41c3b1b98991..658260619423 100644
--- a/Documentation/devicetree/bindings/usb/eswin,eic7700-usb.yaml
+++ b/Documentation/devicetree/bindings/usb/eswin,eic7700-usb.yaml
@@ -41,12 +41,13 @@ properties:
       - const: usb_en

   resets:
-    maxItems: 2
+    maxItems: 3

   reset-names:
     items:
       - const: vaux
       - const: usb_rst
+      - const: usb_phy

   eswin,hsp-sp-csr:
     description:
@@ -85,8 +86,8 @@ examples:
         interrupt-parent = <&plic>;
         interrupts = <85>;
         interrupt-names = "peripheral";
-        resets = <&reset 84>, <&hspcrg 2>;
-        reset-names = "vaux", "usb_rst";
+        resets = <&reset 84>, <&hspcrg 2>, <&hspcrg 4>;
+        reset-names = "vaux", "usb_rst", "usb_phy";
         dr_mode = "peripheral";
         maximum-speed = "high-speed";
         phy_type = "utmi";
--
2.34.1