[v2,2/6] pwm: omap-dmtimer: Update description for pwm omap dm timer

Message ID 20200228095651.32464-3-lokeshvutla@ti.com
State New
Headers show
Series
  • Untitled series #38054
Related show

Commit Message

Lokesh Vutla Feb. 28, 2020, 9:56 a.m.
Update the description with a brief about how pwm is generated
using OMAP DM timer. Also add link to the Reference Manual.

Suggested-by: Uwe Kleine-K├Ânig <u.kleine-koenig@pengutronix.de>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
---
 drivers/pwm/pwm-omap-dmtimer.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
index e4f5f710bfaa..a24a630ccdb9 100644
--- a/drivers/pwm/pwm-omap-dmtimer.c
+++ b/drivers/pwm/pwm-omap-dmtimer.c
@@ -10,7 +10,11 @@ 
  *
  * 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
  */
 
 #include <linux/clk.h>