omap 4460 pwm enable

Jason andy

Hello,

my kernel version is 3.0.21 . I want use ABE_DMIC_DIN2/SLIMBUS2_CLOCK/ABE_MCASP_AXR/GPIO_121/DMTIMER11_PWM_EVT for pwm function . Please tell me how to enable it for pwm .Thanks.

over 9 years ago

0 Yanko Todorov-XID over 9 years ago

TI__Mastermind 29520 points

Hello Jason,

Could you provide us more information about your Hardware platform?

From the explanations in your post you want to use DMTIMER11_PWM_EVT - to generate PWM signal.

Please follow the recommendations in this thread: http://e2e.ti.com/support/omap/f/849/t/169373.aspx

I also suggest you to see:

File with OMAP timers definitions in arch/arm/mach-omap2/timer.c

See the function in arch/arm/plat-omap/dmtimer.c

int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
               int toggle, int trigger)
{
   u32 l;

   if (unlikely(!timer))
       return -EINVAL;

   omap_dm_timer_enable(timer);
   l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
   l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
           OMAP_TIMER_CTRL_PT | (0x03 << 10));
   if (def_on)
       l |= OMAP_TIMER_CTRL_SCPWM;
   if (toggle)
       l |= OMAP_TIMER_CTRL_PT;
   l |= trigger << 10;
   omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);

   /* Save the context */
   timer->context.tclr = l;
   omap_dm_timer_disable(timer);
   return 0;
}

See Table 23-19. GP Timer PWM Mode Configuration in OMAP4 TRM.

For more information see in this patch: http://www.spinics.net/lists/linux-omap/msg83922.html

Best regards,

Yanko

0 Jason andy over 9 years ago in reply to Yanko Todorov-XID

Prodigy 140 points

Hi,Yanko

our hardware platform is omap4460,and software version is android 4AI.1.4.I cant't open http://www.spinics.net/lists/linux-omap/msg83922.html.Could you check it why and in this platform is there an example for using GP Timer PWM? Thanks.