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| author | Hans de Goede <hdegoede@redhat.com> | 2024-05-14 20:03:43 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2024-05-15 10:07:11 +0200 |
| commit | 2513563edc984c3cf05bca1244b46de06daa4755 (patch) | |
| tree | 2ab25e6b11e5b43f8ef12070df46be066777059c /drivers/platform/x86/Kconfig | |
| parent | b444dfc84d6c19fa385be6d89d62b77184f81ea4 (diff) | |
| download | lwn-2513563edc984c3cf05bca1244b46de06daa4755.tar.gz lwn-2513563edc984c3cf05bca1244b46de06daa4755.zip | |
platform/x86: Add new MeeGoPad ANX7428 Type-C Cross Switch driver
Some MeeGoPad top-set boxes have an ANX7428 Type-C Switch for USB3.1 Gen 1
and DisplayPort over Type-C alternate mode support.
The ANX7428 has a microcontroller which takes care of the PD negotiation
and automatically sets the builtin Crosspoint Switch to send the right
signal to the 4 highspeed pairs of the Type-C connector. It also takes
care of HPD and AUX channel routing for DP alternate mode.
IOW the ANX7428 operates fully autonomous and to the x5-Z8350 SoC
things look like there simple is a USB-3 Type-A connector and a
separate DisplayPort connector. Except that the BIOS does not
power on the ANX7428 at boot (meh).
Add a driver to power on the ANX7428. This driver is added under
drivers/platform/x86 rather than under drivers/usb/typec for 2 reasons:
1. This driver is specifically written to work with how the ANX7428 is
described in the ACPI tables of the MeeGoPad x86 (Cherry Trail) devices.
2. This driver only powers on the ANX7428 and does not do anything wrt
its Type-C functionality. It should be possible to tell the controller
which data- and/or power-role to negotiate and to swap the role(s) after
negotiation but the MeeGoPad top-set boxes always draw their power from
a separate power-connector and they only support USB host-mode. So this
functionality is unnecessary and due to lack of documentation this is
tricky to support.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240514180343.70795-1-hdegoede@redhat.com
Diffstat (limited to 'drivers/platform/x86/Kconfig')
| -rw-r--r-- | drivers/platform/x86/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index e5601d8fba68..0ec952b5d03e 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -666,6 +666,17 @@ config ACPI_QUICKSTART To compile this driver as a module, choose M here: the module will be called quickstart. +config MEEGOPAD_ANX7428 + tristate "MeeGoPad ANX7428 Type-C Switch" + depends on ACPI && GPIOLIB && I2C + help + Some MeeGoPad top-set boxes have an ANX7428 Type-C Switch for + USB3.1 Gen 1 and DisplayPort over Type-C alternate mode support. + + This driver takes care of powering on the ANX7428 on supported + MeeGoPad top-set boxes. After this the ANX7428 takes care of Type-C + connector orientation and PD alternate mode switching autonomously. + config MSI_EC tristate "MSI EC Extras" depends on ACPI |