[SRU][K/Unstable][PATCH 0/4] Add USB support for the PolarFire RISC-V SoC

[Emil Renner Berthing]

[Impact]

The 5.19 kernel contains support for the PolarFire Icicle board but the USB driver is missing.

The following patches are available in Linux v6.0-rc1 and are sufficient to make USB usable on the PolarFire Icicle board. Please, apply them to the 5.19 kernel and set CONFIG_USB_MUSB_POLARFIRE_SOC=m.

7a96b6ea90a4 ("usb: musb: Add support for PolarFire SoC's musb controller")
https://lore.kernel.org/r/20220613114642.1615292-2-conor.dooley@microchip.com

21cdd6a0e844 ("usb: musb: mpfs: Fix error codes in probe()")
https://lore.kernel.org/r/YrVmLEc/FOEzNdzj@kili

98ceba755928 ("usb: musb: mpfs: add missing clk_disable_unprepare() in mpfs_remove()"
https://lore.kernel.org/all/YrVmLEc%2FFOEzNdzj@kili/

With this change internal USB devices are fully usable. External devices are supported with the following Jumper settings:

* J17 closed
* J15 open

[Test Plan]

Ensure the correct jumper settings:

* J17 closed
* J15 open

Use the SiFive Unmatched preinstalled image and install the 5.19 kernel. Try to boot on the Polarfire Icicle board.

* Run lsusb.
* Attach a USB device to J16 (USB port beside SD-card slot)
* Run lsusb again. The new device appears.

[Where problems could occur]

The fix only concerns a board which has been unsupported by Ubuntu yet.

In case of an incorrect fix the board might not boot or otherwise malfunction.

Conor Dooley (1):
  usb: musb: Add support for PolarFire SoC's musb controller

Dan Carpenter (1):
  usb: musb: mpfs: Fix error codes in probe()

Emil Renner Berthing (1):
  UBUNTU: [Config] Enable CONFIG_USB_MUSB_POLARFIRE_SOC on riscv64

Yang Yingliang (1):
  usb: musb: mpfs: add missing clk_disable_unprepare() in mpfs_remove()

 debian.master/config/annotations          |   1 +
 debian.master/config/config.common.ubuntu |   1 +
 drivers/usb/musb/Kconfig                  |  13 +-
 drivers/usb/musb/Makefile                 |   1 +
 drivers/usb/musb/mpfs.c                   | 269 ++++++++++++++++++++++
 5 files changed, 284 insertions(+), 1 deletion(-)
 create mode 100644 drivers/usb/musb/mpfs.c

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2.36.1