On Mon, 2010-12-06 at 13:06 +0800, ext Bryan Wu wrote: > > This kind of backlight is, in a sense, totally separate component from > > the panel itself. All they have in common is that they are packaged in > > the same physical display module, and they usually share the same > > connector. > > > > I have seen three kinds of backlights on OMAP devices: > > - on/off GPIO (like on 3430 SDP) > It seems like that we need a gpio_bl.c driver for this kind of usage. > > > - PWM based (zoom seems to have this) > > I failed to find any PWM or Backlight code in ZOOM boards source file. > Is that possible to us pwm_bl.c driver which is used by pxa? It's not yet in the official kernel. You can find it in arch/arm/mach-omap2/board-zoom-display.c in my tree, under devel-branch. I haven't looked at pwm_bl.c, but I wouldn't be surprised if there already was a driver we can use for this. > > - Panel controlled (Taal-panel. Also PWM based, but OMAP doesn't see > > that) > > > Yeah, I don't plan to reform this driver at this time. > > > The first two could (should?) be totally separate backlights from the > > panel itself. For those, a generic backlight driver could perhaps work. > > The third one needs to be quite tied to the panel driver, and I'm not > > sure how easy it would be to have a separate driver for that. > > > > OK, I totally understand you concern now. How about a GPIO based > backlight driver for the first 2 cases. GPIO based backlight driver would work properly only for the first case. Tomi -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
