[Uboot-stm32] [U-BOOT internal][PATCH 0/3] usb: host: dwc2: use driver model for PHY, RESET and CLOCK configuration

[Patrick Delaunay]

In this serie I update the DWC2 host driver to use the device tree
information and the associated PHY, RESET and CLOCK driver
when they are available.

I test this serie on stm32mp157c-ev1 board;
The U-CLASS are provided by:
- PHY by USBPHYC driver = ./drivers/phy/phy-stm32-usbphyc.c
- CLOCK by RCC clock driver = drivers/clk/clk_stm32mp1.c
- RESET by RCC reset driver = drivers/reset/stm32-reset.c

I activate the configuration
+CONFIG_USB_DWC2=y

PS: it is not the default configuration to avoid conflict with device
    as OTG is not correctly handle by DWC2 driver (see DWC3 driver to
    dynamic OTG role support: device or host).

I also deactivate the gadget support (as the OTG/dual role is not
supported in DWC U-Boot driver): only one driver is bound to the
node usbotg_hs with "snps,dwc2" compatible, and today
it is the device one (the first in the driver list).

I also need to deactivate hnp-srp support with:

&usbotg_hs {
	/* need to disable ONLY for HOST support */
	hnp-srp-disable;
};

The test executed on the target:


STM32MP> usb start
starting USB...
Bus usb-otg at 49000000: USB DWC2
Bus usbh-ehci at 5800d000: USB EHCI 1.00
scanning bus usb-otg at 49000000 for devices... 2 USB Device(s) found
scanning bus usbh-ehci at 5800d000 for devices... 3 USB Device(s) found
       scanning usb for storage devices... 2 Storage Device(s) found
STM32MP> usb tree
USB device tree:
  1  Hub (480 Mb/s, 0mA)
  |   U-Boot Root Hub
  |
  +-2  Mass Storage (480 Mb/s, 300mA)
       Verbatim STORE N GO 070731C8ACD7EE97

  1  Hub (480 Mb/s, 0mA)
  |  u-boot EHCI Host Controller
  |
  +-2  Hub (480 Mb/s, 2mA)
    |
    +-3  Mass Storage (480 Mb/s, 500mA)
         Generic  USB Storage

STM32MP> ls usb 0
<DIR>       4096 .
<DIR>       4096 ..
<DIR>      16384 lost+found
<DIR>       4096 record
         1490212 xipImage
        21058006 vmlinux

STM32MP> load usb 0 0xC0000000 vmlinux
21058006 bytes read in 10851 ms (1.9 MiB/s)



Patrick Delaunay (3):
  usb: host: dwc2: add phy support
  usb: host: dwc2: add support for reset and clk
  usb: host: dwc2: add trace to have clean usb start

 drivers/usb/host/dwc2.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 115 insertions(+), 1 deletion(-)

-- 
2.7.4