Add support s4 Power controller. In s4, power control
registers are in secure domain, and should be accessed by smc.
Signed-off-by: NShunzhou Jiang <shunzhou.jiang@amlogic.com>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220307025357.1368673-3-shunzhou.jiang@amlogic.com