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| author |   Lokesh Vutla <lokeshvutla@ti.com> | 2020-03-12 09:52:07 +0530 |
|---|---|---|
| committer |   Thierry Reding <thierry.reding@gmail.com> | 2020-03-30 18:03:06 +0200 |
| commit | 348fb6f7fb4cc7ebc35d1cde6e5c2ada64b683c6 (patch) | |
| tree | d2acff110256705fac0caf344395d8b387062887 | |
| parent | pwm: omap-dmtimer: Drop unused header file (diff) | |
| download | linux-dev-348fb6f7fb4cc7ebc35d1cde6e5c2ada64b683c6.tar.xz linux-dev-348fb6f7fb4cc7ebc35d1cde6e5c2ada64b683c6.zip | |
pwm: omap-dmtimer: Update description for PWM OMAP DM timer
Update the description with a brief about how PWM is generated using
OMAP DM timer and add limitations for the PWM generations. Also add a
link to the reference manual.
Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
| -rw-r--r-- | drivers/pwm/pwm-omap-dmtimer.c | 10 |
1 files changed, 9 insertions, 1 deletions
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> |