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

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Message-ID: <20200228095651.32464-3-lokeshvutla@ti.com>
Date:   Fri, 28 Feb 2020 15:26:47 +0530
From:   Lokesh Vutla <lokeshvutla@...com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
CC:     Tony Lindgren <tony@...mide.com>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pwm@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>, Vignesh R <vigneshr@...com>,
        Lokesh Vutla <lokeshvutla@...com>
Subject: [PATCH v2 2/6] 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. Also add link to the Reference Manual.

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

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>
-- 
2.23.0