linux-kernel - [PATCH] dt-bindings: usb: microchip,usb5744: Add support for configurable board reset delays

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Message-ID: <1749148171-1729610-1-git-send-email-radhey.shyam.pandey@amd.com>
Date: Thu, 5 Jun 2025 23:59:31 +0530
From: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
To: <gregkh@...uxfoundation.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <michal.simek@....com>
CC: <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <git@....com>, Radhey Shyam Pandey
	<radhey.shyam.pandey@....com>
Subject: [PATCH] dt-bindings: usb: microchip,usb5744: Add support for configurable board reset delays

Introduce 'reset-delay-us' and 'power-on-delay-us' properties. Default
delays in datasheet are not good enough for Xilinx Kria KR260 Robotics
Starter Kit (and others) so there is a need to program board specific
reset and power on delay via DT.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
---
Taken reference from mdio.yaml[1]
[1]: Documentation/devicetree/bindings/net/mdio.yaml
---
 .../devicetree/bindings/usb/microchip,usb5744.yaml   | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml b/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml
index c68c04da3399..94a2bebd32da 100644
--- a/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml
+++ b/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml
@@ -52,6 +52,16 @@ properties:
     description:
       phandle of an usb hub connected via i2c bus.
 
+  reset-delay-us:
+    description:
+      RESET pulse width in microseconds.
+
+  power-on-delay-us:
+    description:
+      Delay after power on in microseconds. USB5744 Hub requires some
+      delay after reset to get to state when SMBus configuration
+      data is going to be accepted.
+
 required:
   - compatible
   - reg
@@ -69,6 +79,8 @@ allOf:
         vdd2-supply: false
         peer-hub: false
         i2c-bus: false
+        reset-delay-us: false
+        power-on-delay-us: false
     else:
       $ref: /schemas/usb/usb-device.yaml
 

base-commit: 4f27f06ec12190c7c62c722e99ab6243dea81a94
-- 
2.34.1