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[v3,0/2] usb: Add driver for USB signal re-mapper

Message ID 20201012200007.8862-1-alcooperx@gmail.com
Headers show
Series usb: Add driver for USB signal re-mapper | expand

Message

Alan Cooper Oct. 12, 2020, 8 p.m. UTC 
v3
- Add MODULE_AUTHOR(), LICENSE and DESCRIPTION() so the driver
  can be built as a module.
- Improve Kconfig default entry

v2
- Move file from drivers/usb/host to drivers/usb/misc
- Combine Kconfig/Makefile patch and new driver patch
- Fixed bindings .yaml document based on feedback from Rob Herring
- NOTE: There were suggestions to use a pinmux driver or
  GPIO aggregator, but I think agreement was reached that
  they weren't a good fit.

The Broadcom 7211 has new functionality that allows some USB low
speed side band signals, that go from the XHCI host controller to
pins on the chip, to be remapped to use any GPIO pin instead of the
limited set selectable by hardware. This can be done without changing
the standard driver for the host controller. There is currently
support for three USB signals, PWRON, VBUS_PRESENT and PWRFLT. This
driver will allow the remapping of any of these three signals based
on settings in the Device Tree node for the driver. The driver was
written so that it could handle additional signals added in the
future by just adding the correct properties to the DT node.

Al Cooper (2):
  dt-bindings: Add support for Broadcom USB pin map driver
  usb: Add driver to allow any GPIO to be used for 7211 USB signals

 .../bindings/usb/brcm,usb-pinmap.yaml         |  70 ++++
 MAINTAINERS                                   |   8 +
 drivers/usb/misc/Kconfig                      |   9 +
 drivers/usb/misc/Makefile                     |   1 +
 drivers/usb/misc/brcmstb-usb-pinmap.c         | 351 ++++++++++++++++++
 5 files changed, 439 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml
 create mode 100644 drivers/usb/misc/brcmstb-usb-pinmap.c

Comments

Rob Herring Oct. 19, 2020, 8:19 p.m. UTC | #1 
On Mon, 12 Oct 2020 16:00:06 -0400, Al Cooper wrote:
> Add DT bindings for the Broadcom USB pin map driver. This driver allows
> some USB input and output signals to be mapped to any GPIO instead
> of the normal dedicated pins to/from the XHCI controller.
> 
> Signed-off-by: Al Cooper <alcooperx@gmail.com>
> ---
>  .../bindings/usb/brcm,usb-pinmap.yaml         | 70 +++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml
> 

Reviewed-by: Rob Herring <robh@kernel.org>