RE: [PATCH 2/2] Add LCD support for the LogicPD OMAP3530 DevKits

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> -----Original Message-----
> From: Tomi Valkeinen [mailto:tomi.valkeinen@xxxxxx]
> Sent: Wednesday, May 09, 2012 3:16 AM
> To: Ashwin Bihari
> Cc: linux-omap; Tony Lindgren
> Subject: Re: [PATCH 2/2] Add LCD support for the LogicPD OMAP3530 DevKits

<snip>
 
> > +static int omap3logic_panel_enable_lcd(struct omap_dss_device
> > +*dssdev) {
> > +	gpio_set_value(LCD_PANEL_PWR, 1);
> > +	if (machine_is_omap3530_lv_som())
> > +		gpio_set_value(OMAP3530_LV_SOM_BACKLIGHT_PWR, 1);
> > +	else if (machine_is_omap3_torpedo()) {
> > +		gpio_set_value(OMAP3530_TORPEDO_BACKLIGHT_PWR, 1);
> > +
> > +		gpio_set_value(OMAP3530_TORPEDO_MDISP, 1);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int omap3logic_panel_disable_lcd(struct omap_dss_device
> > +*dssdev) {
> > +	gpio_set_value(LCD_PANEL_PWR, 0);
> > +	if (machine_is_omap3530_lv_som())
> > +		gpio_set_value(OMAP3530_LV_SOM_BACKLIGHT_PWR, 0);
> > +	else if (machine_is_omap3_torpedo()) {
> > +		gpio_set_value(OMAP3530_TORPEDO_BACKLIGHT_PWR, 0);
> > +
> > +		gpio_set_value(OMAP3530_TORPEDO_MDISP, 0);
> > +	}
> > +
> > +	return 0;
> > +}
> 
> This doesn't play well with device-tree. We can't do such callbacks when we
> move to DT.
> 
> I know we have similar code for other boards, and this can't be properly fixed
> right now, but I'm still a bit hesitant to add more such code because I'm the
> one that has to clean it up later for DT =).
> 
> I can handle the LCD_PANEL_PWR gpio, but the backlight is something that
> should be removed from the panel enable callbacks. You could look at
> drivers/video/backlight/ and see if there's something there that could be
> used for your board. Or implement a new BL driver, if nothing fits.
> 
>  Tomi

Tomi,

Let me take a look at your linux-omap-dss2 tree and learn a bit more about DT and figure out how to modify the LCD support so it better aligns with your work and I'll re-submit that patch again..

Thanks
-- -- --
~ Ashwin



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