linux-kernel - [PATCH v3 0/3] phy: cadence: j721e-wiz: Add Type-C plug flip support

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Message-ID: <20191024114042.30237-1-rogerq@ti.com>
Date:   Thu, 24 Oct 2019 14:40:39 +0300
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>
Subject: [PATCH v3 0/3] phy: cadence: j721e-wiz: Add Type-C plug flip support

Hi,

On J721e platform, the 2 lanes of SERDES PHY are used to achieve
USB Type-C plug flip support without any additional MUX component
by using a lane swap feature.

However, the driver needs to know the Type-C plug orientation before
it can decide whether to swap the lanes or not. This is achieved via a
GPIO named DIR.

Another constraint is that the lane swap must happen only when the PHY
is in inactive state. This is achieved by sampling the GPIO and
programming the lane swap before bringing the PHY out of reset.

This series adds support to read the GPIO and accordingly program
the Lane swap for Type-C plug flip support.

Series must be applied on top of
https://lkml.org/lkml/2019/10/23/589

cheers,
-roger

Changelog:
v3
- Rebase on v2 of PHY series and update DT binding to yaml

v2
- revise commit log of patch 1
- use regmap_field in patch 3

Roger Quadros (3):
  phy: cadence: Sierra: add phy_reset hook
  dt-bindings: phy: ti,phy-j721e-wiz: Add Type-C dir GPIO
  phy: ti: j721e-wiz: Manage typec-gpio-dir

 .../bindings/phy/ti,phy-j721e-wiz.yaml        | 15 ++++++
 drivers/phy/cadence/phy-cadence-sierra.c      | 10 ++++
 drivers/phy/ti/phy-j721e-wiz.c                | 48 +++++++++++++++++++
 3 files changed, 73 insertions(+)

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