linux-kernel - [PATCH V4 0/6] Add Embedded USB Debugger (EUD) driver

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Date:   Fri, 21 Jan 2022 19:23:45 +0530
From:   Souradeep Chowdhury <quic_schowdhu@...cinc.com>
To:     <linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <pure.logic@...us-software.ie>,
        <bjorn.andersson@...aro.org>, <greg@...ah.com>, <robh@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <quic_tsoni@...cinc.com>,
        <quic_psodagud@...cinc.com>, <quic_satyap@...cinc.com>,
        <quic_pheragu@...cinc.com>, <quic_rjendra@...cinc.com>,
        <quic_sibis@...cinc.com>, <quic_saipraka@...cinc.com>,
        <quic_schowdhu@...cinc.com>
Subject: [PATCH V4 0/6] Add Embedded USB Debugger (EUD) driver

This is a series of patches that implements a driver for the control
peripheral, EUD (Embedded USB Debugger). The EUD is a mini-USB hub
implemented on chip to support the USB-based debug and trace capabilities.
Apart from debug capabilities, EUD has a control peripheral. Control
Peripheral is on when EUD is on and gets signals like USB attach, pet
EUD etc. EUD driver listens to events like USB attach or detach and then
informs the USB about these events via ROLE-SWITCH. At regular intervals,
the EUD driver receives an interrupt to pet the driver indicating that
the software is functional.

Changes in V4

* Aligned the device tree node structure of EUD as per discussion.

* Changes to usb-connector.yaml is no longer required and is not 
  included in the patch series.

* Implemented the rest of the comments on Version 3 of the patch.  

Changes in V3

* Removed the patch for registration of EUD connector as it is no longer
  required.

* Added the description to include EUD in usb-connector.yaml  

* Implemented comments on V2 of the patch.

Changes in V2

* Fixed the yaml issue and also implemented comments on yaml in V1.

Changes in V1

* EUD has now been mapped as a separate DT node as it is an independent QCOM IP.

* EUD is attached to the connector child of dwc3 via port end point since EUD
  driver needs the connector for role-switching.

* EUD driver has been moved now to drivers/soc/qcom/qcom_eud.c.

* All the comments from version 0 of the patch has been implemented.

Souradeep Chowdhury (6):
  dt-bindings: Add the yaml bindings for EUD
  bindings: usb: dwc3: Update dwc3 properties for EUD connector
  soc: qcom: eud: Add driver support for Embedded USB Debugger(EUD)
  arm64: dts: qcom: sc7280: Add EUD dt node and dwc3 connector
  arm64: dts: qcom: sc7280: Set the default dr_mode for usb2
  MAINTAINERS: Add maintainer entry for EUD

 Documentation/ABI/testing/sysfs-driver-eud         |   9 +
 .../devicetree/bindings/soc/qcom/qcom,eud.yaml     |  77 +++++++
 .../devicetree/bindings/usb/snps,dwc3.yaml         |  10 +
 MAINTAINERS                                        |   8 +
 arch/arm64/boot/dts/qcom/sc7280-idp.dts            |   4 +
 arch/arm64/boot/dts/qcom/sc7280.dtsi               |  39 ++++
 drivers/soc/qcom/Kconfig                           |  10 +
 drivers/soc/qcom/Makefile                          |   1 +
 drivers/soc/qcom/qcom_eud.c                        | 250 +++++++++++++++++++++
 9 files changed, 408 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-eud
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
 create mode 100644 drivers/soc/qcom/qcom_eud.c

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2.7.4