linux-kernel - [PATCH V2 0/2] usb: misc: add support for microchip,usb2244 USB-SD controller

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Date:   Mon, 22 Nov 2021 11:58:32 +0530
From:   Piyush Mehta <piyush.mehta@...inx.com>
To:     <gregkh@...uxfoundation.org>, <robh+dt@...nel.org>,
        <mka@...omium.org>, <ravisadineni@...omium.org>,
        <stern@...land.harvard.edu>, <alcooperx@...il.com>,
        <michal.simek@...inx.com>
CC:     <piyush.mehta@...inx.com>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <git@...inx.com>, <sgoud@...inx.com>
Subject: [PATCH V2 0/2] usb: misc: add support for microchip,usb2244 USB-SD controller

Microchip's USB224x family of Hi-Speed USB 2.0 flash media card
controllers provide an ultra-fast interface between a USB host
controller and flash media cards.

This patch adds a GPIO based usb-sd reset for USB2244 USB2 ultra
fast SD controller. This usb2244 driver trigger sd reset signal
after soft reset or core Reset. The SD needs to be resetted after
completion of phy initialization. After the toggling of gpio,
controller gets out form reset.

As part of the reset, sets the direction of the pin to output before
toggling the pin. Delay of microseconds is added in between low and
high to meet the setup and hold time requirement of the reset.
---
Changes for V2:
- Update reset polarity, make reset ACTIVE LOW in the dt-binding document
  and usb2244 driver.
- Fix WARNING: msleep < 20ms can sleep for up to 20ms by changing msleep to
  usleep_range()
- Addressed Rob Herring review comments
  - Added usbsd node under the usb controller (usb0) node.
  - Remove Warning: decoded text below may be mangled, UTF-8 assumed.	

Review comments:
Link: https://lore.kernel.org/lkml/20211024180628.2992108-3-piyush.mehta@xilinx.com/t/#m2e146078276051984a144ba074c6cf4eee07b4d0
---
Piyush Mehta (2):
  dt-bindings: usb: misc: Add binding for Microchip usb2244 Controller
  usb: misc: usb244: add support for USB2 ultra fast sd controller

 .../devicetree/bindings/usb/microchip,usb2244.yaml | 47 +++++++++++++++
 drivers/usb/misc/Kconfig                           | 10 ++++
 drivers/usb/misc/Makefile                          |  1 +
 drivers/usb/misc/usb2244.c                         | 69 ++++++++++++++++++++++
 4 files changed, 127 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/microchip,usb2244.yaml
 create mode 100644 drivers/usb/misc/usb2244.c

-- 
2.7.4