pwm: Add DT documentation for SiFive PWM Controller

DT documentation for PWM controller added from Linux v5.6

commit: daa78cc3408e
("pwm: sifive: Add DT documentation for SiFive PWM Controller")

Signed-off-by: Yash Shah <yash.shah@sifive.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
1 file changed