[v5,0/4] usb: xhci: Load Raspberry Pi 4 VL805's firmware

Newer revisions of the RPi4 need their xHCI chip, VL805, firmware to be
loaded explicitly. Earlier versions didn't need that as they where using
an EEPROM for that purpose. This series takes care of setting up the
relevant infrastructure and run the firmware loading routine at the
right moment.

Note that this builds on top of Sylwester Nawrocki's "USB host support
for Raspberry Pi 4 board" series.

This also depends on a DT/bindings patch available on the linux-mailing lists:
https://www.mail-archive.com/linux-kernel at vger.kernel.org/msg2205783.html

Here is the relevant bit for reference/discussion:

	&pcie0 {
	       pci at 1,0 {
		       #address-cells = <3>;
		       #size-cells = <2>;
		       ranges;

		       reg = <0 0 0 0 0>;

		       usb at 1,0 {
			       reg = <0x10000 0 0 0 0>;
			       resets = <&reset RASPBERRYPI_FIRMWARE_RESET_ID_USB>;
		       };
	       };
	};

---

Changes since v4:
 - Correct DT PCI topology, I separated the root bridge and controller
   DT nodes
 - Get rid of PCI core patch as not needed with correct DT PCI topology
 - Move reset support to xchi core

Changes since v3:
 - Use reset controller

Changes since v2:
 - Correct comment on patch #1
 - Address Matthias' comments

Changes since v1:
 - Rename function
 - Use callback in xhci-pci.c

Nicolas Saenz Julienne (4):
  arm: rpi: Add function to trigger VL805's firmware load
  reset: Add Raspberry Pi 4 firmware reset controller
  configs: Enable support for reset controllers on RPi4
  usb: xhci: Add reset controller support

 arch/arm/mach-bcm283x/include/mach/mbox.h     | 13 ++++
 arch/arm/mach-bcm283x/include/mach/msg.h      |  7 +++
 arch/arm/mach-bcm283x/msg.c                   | 46 ++++++++++++++
 configs/rpi_4_32b_defconfig                   |  1 +
 configs/rpi_4_defconfig                       |  1 +
 configs/rpi_arm64_defconfig                   |  1 +
 drivers/reset/Kconfig                         | 10 ++++
 drivers/reset/Makefile                        |  1 +
 drivers/reset/reset-raspberrypi.c             | 60 +++++++++++++++++++
 drivers/usb/host/xhci-mem.c                   |  2 +
 drivers/usb/host/xhci.c                       | 33 ++++++++++
 .../reset/raspberrypi,firmware-reset.h        | 13 ++++
 include/usb/xhci.h                            |  2 +
 13 files changed, 190 insertions(+)
 create mode 100644 drivers/reset/reset-raspberrypi.c
 create mode 100644 include/dt-bindings/reset/raspberrypi,firmware-reset.h