The Infineon/Intel XMM6260 is a 3G-focused, slim modem platform designed
for smartphones, data cards, and Machine-to-Machine (M2M) applications.
The modem is typically connected via the application processor's USB line
in HSIC mode. To function correctly, the modem must control this line, as
it requires precise timing to initiate or de-initialize the USB connection.
This control is necessary to successfully enumerate the next stage of the
USB device loader (moving from firmware loading to the actual device
interface for example).
Patchset adds support for the generic portion of the Infineon XMM6260
baseband modem, which was used in many Tegra-, OMAP-, and Exynos-based
devices circa 2012. This driver provides generic power sequences,
manages initial communication with the application processor, handles the
SoC-specific modem powersequence, and verifies that the modem USB device
appears correctly.
While current support is relatively basic, this configuration already
allows the modem device to appear in the dmesg of my device
(LG Optimus Vu (P895)):
[ 9.427014] ci_hdrc ci_hdrc.1: EHCI Host Controller
[ 9.431488] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1
[ 9.457197] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
[ 9.460370] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.16
[ 9.468470] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 9.475597] usb usb1: Product: EHCI Host Controller
[ 9.480508] usb usb1: Manufacturer: Linux 6.16.0+ ehci_hcd
[ 9.485913] usb usb1: SerialNumber: ci_hdrc.1
[ 9.490862] hub 1-0:1.0: USB hub found
[ 9.494005] hub 1-0:1.0: 1 port detected
[ 9.657191] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[ 9.844726] usb 1-1: New USB device found, idVendor=1519, idProduct=0020, bcdDevice=12.74
[ 9.850530] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 9.857594] usb 1-1: Product: HSIC Device
[ 9.861606] usb 1-1: Manufacturer: Comneon
[ 9.865627] usb 1-1: SerialNumber: 0123456789
[ 9.908739] cdc_acm 1-1:1.0: ttyACM0: USB ACM device
This patchset is a part of larger series aiming to bring XMM6260 modem
support for Tegra devices:
https://lore.kernel.org/lkml/20260511135703.62470-1-clamor95@gmail.com/
---
Changes in v2:
- changed phy to pwrseq in schema
- adjusted Kconfig dependencies
- implemented bitmap for modem state tracking
- switched from phy to power sequencing
- in notifier added chech to filter only USB events
- in notifier added USB_DEVICE_REMOVE
- added tracking for regulator, rfkill access, usb device
presence and poweroff calls using bitops
- moved pseq on call from work to irq handler
- improved rfkill registration logic
---
Svyatoslav Ryhel (2):
dt-bindings: net: Document Infineon/Intel XMM6260 modem
net: usb: Add Infineon XMM6260 Baseband modem support
.../bindings/net/infineon,xmm6260.yaml | 74 ++++
drivers/net/usb/Kconfig | 15 +
drivers/net/usb/Makefile | 1 +
drivers/net/usb/baseband-xmm6260.c | 378 ++++++++++++++++++
4 files changed, 468 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/infineon,xmm6260.yaml
create mode 100644 drivers/net/usb/baseband-xmm6260.c
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2.51.0