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Published 20 hours ago • verified publisher icon grate-driver

Enable modem on Pegatron Chagall

Open cunidev opened this issue 2 years ago • 5 comments

According to downstream sources, it looks like the chagall 3G modem is on an internal USB bus, plus needing plenty of initialization pins and a custom driver.

From what I understand, in order to achieve the following I should:

  • enable the USB bus first, maybe in "host" mode to see if the modem pops up?
  • add regulators for the USB bus and modem power
  • add a GPIO hog for all modem pins
  • finally, port the device (Huawei MU739) to ModemManager

Is there any other Tegra device with working USB modem in mainline? I see that tilapia had something similar (https://kernel.googlesource.com/pub/scm/linux/kernel/git/linusw/linux-integrator/+/apq8060-dragonboard-pm8901-stab/arch/arm/boot/dts/tegra30-asus-nexus7-tilapia.dtsi#26), but it was never really enabled.

cunidev avatar Oct 13 '21 08:10 cunidev