linux-kernel - [PATCH 1/2] dt-bindings: connector: Add properties to define time values

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241022-pd-dt-time-props-v1-1-fea96f51b302@google.com>
Date: Tue, 22 Oct 2024 20:55:48 -0700
From: Amit Sunil Dhamne <amitsd@...gle.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, Badhri Jagan Sridharan <badhri@...gle.com>, 
	RD Babiera <rdbabiera@...gle.com>, Kyle Tso <kyletso@...gle.com>, 
	Amit Sunil Dhamne <amitsd@...gle.com>
Subject: [PATCH 1/2] dt-bindings: connector: Add properties to define time values

This commit adds the following properties:
  * sink-wait-cap-time-ms
  * ps-source-off-time-ms
  * cc-debounce-time-ms

This is to enable setting of platform/board specific timer values as
these timers have a range of acceptable values.

Signed-off-by: Amit Sunil Dhamne <amitsd@...gle.com>
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
---
 .../bindings/connector/usb-connector.yaml          | 35 +++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
index fb216ce68bb3..21a0c58c65cd 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
+++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
@@ -253,6 +253,36 @@ properties:
 
     additionalProperties: false
 
+  sink-wait-cap-time-ms:
+    description: Represents the max time in ms that USB Type-C port (in sink
+      role) should wait for the port partner (source role) to send source caps.
+      SinkWaitCap timer starts when port in sink role attaches to the source.
+      This timer will stop when sink receives PD source cap advertisement before
+      timeout in which case it'll move to capability negotiation stage. A
+      timeout leads to a hard reset message by the port.
+    minimum: 310
+    maximum: 620
+    default: 310
+
+  ps-source-off-time-ms:
+    description: Represents the max time in ms that a DRP in source role should
+      take to turn off power after the PsSourceOff timer starts. PsSourceOff
+      timer starts when a sink's PHY layer receives EOP of the GoodCRC message
+      (corresponding to an Accept message sent in response to a PR_Swap or a
+      FR_Swap request). This timer stops when last bit of GoodCRC EOP
+      corresponding to the received PS_RDY message is transmitted by the PHY
+      layer. A timeout shall lead to error recovery in the type-c port.
+    minimum: 750
+    maximum: 920
+    default: 920
+
+  cc-debounce-time-ms:
+    description: Represents the max time in ms that a port shall wait to
+      determine if it's attached to a partner.
+    minimum: 100
+    maximum: 200
+    default: 200
+
 dependencies:
   sink-vdos-v1: [ sink-vdos ]
   sink-vdos: [ sink-vdos-v1 ]
@@ -380,7 +410,7 @@ examples:
     };
 
   # USB-C connector attached to a typec port controller(ptn5110), which has
-  # power delivery support and enables drp.
+  # power delivery support, explicitly defines time properties and enables drp.
   - |
     #include <dt-bindings/usb/pd.h>
     typec: ptn5110 {
@@ -393,6 +423,9 @@ examples:
             sink-pdos = <PDO_FIXED(5000, 2000, PDO_FIXED_USB_COMM)
                          PDO_VAR(5000, 12000, 2000)>;
             op-sink-microwatt = <10000000>;
+            sink-wait-cap-time-ms = <465>;
+            ps-source-off-time-ms = <835>;
+            cc-debounce-time-ms = <101>;
         };
     };
 

-- 
2.47.0.105.g07ac214952-goog