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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>
This commit is contained in:
Lokesh Vutla 2020-03-12 09:52:07 +05:30 committed by Thierry Reding
parent 54091b5f19
commit 348fb6f7fb
1 changed files with 9 additions and 1 deletions
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10
drivers/pwm/pwm-omap-dmtimer.c
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@ -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>