diff options
author | Piyush Mehta <piyush.mehta@xilinx.com> | 2022-05-04 13:23:09 +0530 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-05 22:02:39 +0200 |
commit | ca05b38252d7bf6b0d42e80b3d3d98a642f4143b (patch) | |
tree | 58cb3edef537afe19b4ac917a319b9f875f7d0ee /drivers/usb/dwc3/gadget.c | |
parent | dt-bindings: usb: dwc3-xilinx: add optional property reset-gpios (diff) | |
download | linux-dev-ca05b38252d7bf6b0d42e80b3d3d98a642f4143b.tar.xz linux-dev-ca05b38252d7bf6b0d42e80b3d3d98a642f4143b.zip |
usb: dwc3: xilinx: Add gpio-reset support
This patch adds a USB GPIO based reset for dwc3-xilinx driver. The PHY
needs to be reset after the completion of phy initialization. As part
of the reset, check for gpio-reset binding before toggling the pin.
This feature is advantageous when the user toggle GPIO to trigger the
ULPI-PHY reset.
Delay of milliseconds is added in between low and high to meet the setup
and hold time requirement of the reset. The reset-gpio error handling is
added for error notification.
Some GPIO controllers must be accessed using message-based buses, like
I2C or SPI, to address this problem, updates GPIO access with sleep API.
This reset is specific to the zynqMp.
Signed-off-by: Piyush Mehta <piyush.mehta@xilinx.com>
Link: https://lore.kernel.org/r/20220504075309.6244-3-piyush.mehta@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
0 files changed, 0 insertions, 0 deletions