eUSB2 targets handle wakeup interrupts differently depending on device
speed when operating in host mode.
According to the eUSB2 specification, remote wakeup signaling in host
mode is detected via different data-line assertions based on the
connected device speed.
When a low-speed device is connected, the host repeater drives eD+ to
logic '1' upon detecting a K-state on the USB lines during remote wakeup
(eUSB2 specification, Section 5.5.14).
When a full-speed or high-speed device is connected, the host repeater
drives eD- to logic '1' upon detecting a K-state on the USB line during
remote wakeup (eUSB2 specification, Sections 5.5.15 and 5.5.18).
Since the eUSB2 PHY's "DP" and "DM" interrupt lines monitor the eD+ and
eD- line states, configure the wakeup interrupts accordingly
Add support for a new phy "type" attribute to be set by eusb2 phy drivers
and be read by consumers (in this case usb controller) and act accordingly
Changes in v5:
- Add support for phy "type" attribute and set it from m31 and snps eusb2
phy probes.
- Removed adding a new binding property
Link to v4:
https://lore.kernel.org/all/20260709-eusb2-interrupt-handling-v5-v4-0-d4f993925608@oss.qualcomm.com/
Changes in v4:
- Moved to using binding approach as suggested by Thinh
Link to v3:
https://lore.kernel.org/all/20260511094422.3561509-1-krishna.kurapati@oss.qualcomm.com/
Changes in v3:
- Removed multiple glymur-dwc3-mp pdata entries
- Replaced use of ternary operators with if-else
Link to v2:
https://lore.kernel.org/all/20260505194242.1947891-1-krishna.kurapati@oss.qualcomm.com/
Changes in v2:
- Updated commit message
- added supported eUSB2 targets
Link to v1:
https://lore.kernel.org/all/20260502095616.666938-1-krishna.kurapati@oss.qualcomm.com/
Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
---
Krishna Kurapati (5):
dt-bindings: phy: Add PHY_TYPE_EUSB2 definition
include: linux: phy: Add phy attribute "type" and associated helpers
phy: snps-eusb2: Set phy type to EUSB2
phy: qcom: m31-eusb2: Set phy type to EUSB2
usb: dwc3: qcom: Modify interrupt handling for eUSB2 Phy targets
drivers/phy/phy-snps-eusb2.c | 4 +++
drivers/phy/qualcomm/phy-qcom-m31-eusb2.c | 4 +++
drivers/usb/dwc3/dwc3-qcom.c | 53 +++++++++++++++++++++++++------
include/dt-bindings/phy/phy.h | 1 +
include/linux/phy/phy.h | 27 ++++++++++++++++
5 files changed, 79 insertions(+), 10 deletions(-)
---
base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
change-id: 20260718-eusb2-int-handling-v5-e2b7d2f58b73
Best regards,
--
Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>