Update the description with a brief about how pwm is generated using OMAP DM timer and add Limitations for the pwm generations. Also add link to the Reference Manual. Suggested-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> Acked-by: Tony Lindgren <tony@xxxxxxxxxxx> Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx> --- drivers/pwm/pwm-omap-dmtimer.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index e4f5f710bfaa..92aac6c86b95 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -10,7 +10,15 @@ * * Description: * This file is the core OMAP support for the generic, Linux - * PWM driver / controller, using the OMAP's dual-mode timers. + * PWM driver / controller, using the OMAP's dual-mode timers + * with a timer counter that goes up. When it overflows it gets + * reloaded with the load value and the pwm output goes up. + * When counter matches with match register, the output goes down. + * Reference Manual: http://www.ti.com/lit/ug/spruh73q/spruh73q.pdf + * + * Limitations: + * - When PWM is stopped, timer counter gets stopped immediately. This + * doesn't allow the current PWM period to complete and stops abruptly. */ #include <linux/clk.h> -- 2.23.0
