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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 <[email protected]>
Reviewed-by: Bartosz Golaszewski <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Reviewed-by: Sven Peter <[email protected]>
Signed-off-by: "Russell King (Oracle)" <[email protected]>
Reviewed-by: Alyssa Rosenzweig <[email protected]>
Reviewed-by: Neal Gompa <[email protected]>
Signed-off-by: Sven Peter <[email protected]>
Acked-by: Bartosz Golaszewski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>
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