pwm: pwm-tiehrpwm: Fix conflicting channel period setting
authorPhilip, Avinash <avinashphilip@ti.com>
Thu, 6 Sep 2012 05:14:25 +0000 (10:44 +0530)
committerThierry Reding <thierry.reding@avionic-design.de>
Mon, 10 Sep 2012 15:04:38 +0000 (17:04 +0200)
commit01b2d4536f0215c6d97d77e157afee04300ffc90
treef0cf06b9c3aaa834a578e0eeda01e72ba51c2653
parentc06fad9d28c95b024ea10455cf1397432b12848d
pwm: pwm-tiehrpwm: Fix conflicting channel period setting

EHRPWM hardware supports 2 independent PWM channels. However the device
uses only one register to handle period setting for both channels. So
both channels should be configured for same period (in nsec).

Fix the same by returning error for conflicting period values.

However, allow
1. Configuration of period settings if not conflicting with other
channels
2. Re-configuring of period settings if no other channels being
configured

Signed-off-by: Philip, Avinash <avinashphilip@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
drivers/pwm/pwm-tiehrpwm.c