[PATCH] drivers/pwm: add PXA pulse width modulator controller

[Robert Jarzmik]

Sascha Hauer <s.hauer at pengutronix.de> writes:

> Hi Robert,
>
> Why not implement it as a regular driver? If we ever want to implement
> a commandline control of the pwms via pwm0.dutyns=xx we'll need
> a struct device.

This is because in my own case, I need pwm to be registered before other devices
are probed. The trouble (in my case) is that for drivers/video/pxa.c, I have the
following call path :
 - pxafb_probe()
   -> pxafb_enable_controller()
     -> pxafb_backlight_power()
       -> mioa701_lcd_backlight()
          => 	struct pwm_device *pwm0 = pwm_request("pxa_pwm0");
		pwm_enable(pwm0);
		pwm_config(pwm0, 2000 * 1024, 4000 * 1024);

I'm a bit afraid that the pxafb driver will be probed first, before pwm_pxa, and
therefore the backlight setting won't work. I haven't found a clean way to
specify this dependency.

Cheers.

-- 
Robert