Add initial reset controller API documentation. This is mostly intended
to describe the concepts to users of the consumer API, and to tie the
kerneldoc comments we already have into the driver API documentation.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: NRandy Dunlap <rdunlap@infradead.org>
Reviewed-by: NAmjad Ouled-Ameur <aouledameur@baylibre.fr>
Link: https://lore.kernel.org/r/20201201115754.1713-1-p.zabel@pengutronix.deSigned-off-by: NJonathan Corbet <corbet@lwn.net>