On Tue, Sep 6, 2022, at 15:19, Russell King wrote: > From: Hector Martin <marcan@xxxxxxxxx> > > This driver implements the GPIO service on top of the SMC framework > on Apple Mac machines. In particular, these are the GPIOs present in the > PMU IC which are used to control power to certain on-board devices. > > Although the underlying hardware supports various pin config settings > (input/output, open drain, etc.), this driver does not implement that > functionality and leaves it up to the firmware to configure things > properly. We also don't yet support interrupts/events. This is > sufficient for device power control, which is the only thing we need to > support at this point. More features will be implemented when needed. > > To our knowledge, only Apple Silicon Macs implement this SMC feature. > > Signed-off-by: Hector Martin <marcan@xxxxxxxxx> > Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> Reviewed-by: Sven Peter <sven@xxxxxxxxxxxxx>
