On Fri, Feb 16, 2018 at 11:55 PM, Thinh Nguyen
<Thinh.Nguyen@xxxxxxxxxxxx> wrote:
> Add the ability for PCI platforms to customize device properties via
> debugfs attributes. For IP and FPGA validation purposes, this feature is
> useful to test against various HW configurations that are normally
> statically configured in a real HW. It allows changing of the device
> properties while using the same PID and VID without recompiling the
> driver with a different set of properties every time.
>
> Overview of this feature:
> * dwc3_pci_probe() will not immediately create and add platform device
> (That is, nothing will happen when dwc3-pci module is first loaded)
> * The user initiates platform device creation and addition to device
> hierarchy by writing to 'start' debugfs attribute
> * dwc3-pci creates debugfs attributes for device properties
> * The user can set these properties via those attributes
> * dwc3-pci stores the properties that the user set (they are added to
> platform device when user initiates 'start')
> * Device properties cannot be changed after the platform device has
> been added to device hierarchy
>
> This feature is not enabled by default, the user must enable
> CONFIG_USB_DWC3_PCI_DEBUGFS in order to use this feature. Currently
> there is only one property -- maximum_speed.
I dunno if Felipe likes the idea, but I would rather convert PCI glue
driver from being parent device to being the device (by using dwc3
platform driver as a library).
I also don't know if it's possible with regard to multiple quirks the
driver might have.
> Thinh Nguyen (7):
> usb: dwc3: pci: Properly cleanup resource
> usb: dwc3: pci: Set an easily recognizable device name
> usb: dwc3: pci: Store device properties dynamically
> usb: dwc3: pci: Move platform creation from probe function
> usb: dwc3: Rename dwc3-pci.c to pci.c
> usb: dwc3: pci: Create header file
> usb: dwc3: pci: Add debugfs for device properties
>
> drivers/usb/dwc3/Kconfig | 11 ++
> drivers/usb/dwc3/Makefile | 5 +
> drivers/usb/dwc3/dwc3-pci.h | 72 +++++++++++
> drivers/usb/dwc3/pci-debugfs.c | 144 ++++++++++++++++++++++
> drivers/usb/dwc3/{dwc3-pci.c => pci.c} | 214 ++++++++++++++++++++++++---------
> 5 files changed, 392 insertions(+), 54 deletions(-)
> create mode 100644 drivers/usb/dwc3/dwc3-pci.h
> create mode 100644 drivers/usb/dwc3/pci-debugfs.c
> rename drivers/usb/dwc3/{dwc3-pci.c => pci.c} (77%)
>
> --
> 2.11.0
>
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--
With Best Regards,
Andy Shevchenko
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