linux-kernel - [PATCH v4 2/3] dt-bindings: phy: ti,phy-j721e-wiz: Add Type-C dir GPIO

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Message-ID: <20191028102153.24866-3-rogerq@ti.com>
Date:   Mon, 28 Oct 2019 12:21:52 +0200
From:   Roger Quadros <rogerq@...com>
To:     <kishon@...com>
CC:     <aniljoy@...ence.com>, <adouglas@...ence.com>, <nsekhar@...com>,
        <jsarha@...com>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Roger Quadros <rogerq@...com>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH v4 2/3] dt-bindings: phy: ti,phy-j721e-wiz: Add Type-C dir GPIO

This is an optional GPIO, if specified will be used to
swap lane 0 and lane 1 based on GPIO status. This is required
to achieve plug flip support for USB Type-C.

Type-C companions typically need some time after the cable is
plugged before and before they reflect the correct status of
Type-C plug orientation on the DIR line.

Type-C Spec specifies CC attachment debounce time (tCCDebounce)
of 100 ms (min) to 200 ms (max).

Allow the DT node to specify the time (in ms) that we need
to wait before sampling the DIR line.

Signed-off-by: Roger Quadros <rogerq@...com>
Cc: Rob Herring <robh@...nel.org>
---
 .../bindings/phy/ti,phy-j721e-wiz.yaml          | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/ti,phy-j721e-wiz.yaml b/Documentation/devicetree/bindings/phy/ti,phy-j721e-wiz.yaml
index 8a1eccee6c1d..b5dcf80b8831 100644
--- a/Documentation/devicetree/bindings/phy/ti,phy-j721e-wiz.yaml
+++ b/Documentation/devicetree/bindings/phy/ti,phy-j721e-wiz.yaml
@@ -53,6 +53,23 @@ properties:
   assigned-clock-parents:
     maxItems: 2
 
+  typec-dir-gpios:
+    maxItems: 1
+    description:
+      GPIO to signal Type-C cable orientation for lane swap.
+      If GPIO is active, lane 0 and lane 1 of SERDES will be swapped to
+      achieve the funtionality of an external type-C plug flip mux.
+
+  typec-dir-debounce-ms:
+    minimum: 100
+    maximum: 1000
+    default: 100
+    description:
+      Number of milliseconds to wait before sampling typec-dir-gpio.
+      If not specified, the default debounce of 100ms will be used.
+      Type-C spec states minimum CC pin debounce of 100 ms and maximum
+      of 200 ms. However, some solutions might need more than 200 ms.
+
 patternProperties:
   "^pll[0|1]_refclk$":
     type: object
-- 
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