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WIP: SMC power

Angus Ainslie requested to merge angus.ainslie/linux:smc-power into imx8-current-librem5

This adds regulator control to imx serial driver.

This works but I it's not the correct way to solve this

  • Adds a second user of the gnss regulator so that regulator never turns off
  • The regulator isn't turned on and off when the port is opened and closed

We either need to keep abusing the LED interface for now or expand/abuse the gnss driver framework

/cc @martin.kepplinger @guido.gunther @sebastian.krzyszkowiak @dorota.czaplejewicz

Anyone else have a better idea ?

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