A USB super-speed-plus device may operate at different sublink speed and lane count (e.g. gen2x2, gen1x2, or gen2x1). The usb gadget stack needs to be able to handle a couple things: 1) Report the sublink speed attributes the device support 2) Select the sublink speed attribute This series introduces sublink speed attribute structure to ch9.h to capture the device capability of the gadget. It also introduces a new gadget ops udc_set_num_lanes_and_speed to select a specific sublink speed. DWC3 needs this support for DWC_usb32 IP. Implement the new changes for DWC3. Changes in v2: - Move usb_sublink_speed attribute struct and enum to include/linux/usb/ch9.h - Use "num-lanes" and "lane-speed-mantissa-gbps" as common properties instead - Add common functions to get num-lanes and lsm properties - Fix missing gen1x2 sublink speed attribute check report in dwc3 Thinh Nguyen (12): usb: ch9: Add sublink speed struct usb: gadget: composite: Avoid using magic numbers usb: gadget: Expose sublink speed attributes usb: gadget: Set max speed for SSP devices usb: composite: Properly report sublink speed usb: devicetree: Introduce num-lanes and lsm usb: common: Add functions to get lanes and lsm usb: dwc3: Initialize lane count and sublink speed usb: dwc3: gadget: Report sublink speed capability usb: dwc3: gadget: Implement setting of sublink speed usb: dwc3: gadget: Track connected lane and sublink speed usb: dwc3: gadget: Set speed only up to the max supported Documentation/devicetree/bindings/usb/generic.txt | 11 ++ drivers/usb/common/common.c | 26 ++++ drivers/usb/dwc3/core.c | 62 ++++++++++ drivers/usb/dwc3/core.h | 18 +++ drivers/usb/dwc3/gadget.c | 143 +++++++++++++++++++++- drivers/usb/gadget/composite.c | 81 ++++++++---- drivers/usb/gadget/udc/core.c | 24 +++- include/linux/usb/ch9.h | 62 ++++++++++ include/linux/usb/gadget.h | 23 ++++ 9 files changed, 414 insertions(+), 36 deletions(-) base-commit: 5db5ea26a2469d8899f995e82e8b718dc9e9d168 -- 2.11.0
